Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases

Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parost...
Ausführliche Beschreibung

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Autor*in:	Papathanassiou, Zafiria G [verfasserIn] Alberghini, Marco [verfasserIn] Thiesse, Philippe [verfasserIn] Gambarotti, Marco [verfasserIn] Bianchi, Giuseppe [verfasserIn] Tranfaglia, Cristina [verfasserIn] Vanel, Daniel [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2011

Schlagwörter:	Osteosarcoma Distal Femur Host Bone Myositis Ossificans Parosteal Osteosarcoma

Übergeordnetes Werk:	Enthalten in: Clinical Sarcoma Research - London : BioMed Central, 2011, 1(2011), 1 vom: 25. Juli
Übergeordnetes Werk:	volume:1 ; year:2011 ; number:1 ; day:25 ; month:07

Links:	Volltext

DOI / URN:	10.1186/2045-3329-1-2

Katalog-ID:	SPR031838286

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520			\|a Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning.
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allfields	10.1186/2045-3329-1-2 doi (DE-627)SPR031838286 (SPR)2045-3329-1-2-e DE-627 ger DE-627 rakwb eng 610 ASE Papathanassiou, Zafiria G verfasserin aut Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning. Osteosarcoma (dpeaa)DE-He213 Distal Femur (dpeaa)DE-He213 Host Bone (dpeaa)DE-He213 Myositis Ossificans (dpeaa)DE-He213 Parosteal Osteosarcoma (dpeaa)DE-He213 Alberghini, Marco verfasserin aut Thiesse, Philippe verfasserin aut Gambarotti, Marco verfasserin aut Bianchi, Giuseppe verfasserin aut Tranfaglia, Cristina verfasserin aut Vanel, Daniel verfasserin aut Enthalten in Clinical Sarcoma Research London : BioMed Central, 2011 1(2011), 1 vom: 25. Juli (DE-627)666217785 (DE-600)2623217-0 2045-3329 nnns volume:1 year:2011 number:1 day:25 month:07 https://dx.doi.org/10.1186/2045-3329-1-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 1 2011 1 25 07
spelling	10.1186/2045-3329-1-2 doi (DE-627)SPR031838286 (SPR)2045-3329-1-2-e DE-627 ger DE-627 rakwb eng 610 ASE Papathanassiou, Zafiria G verfasserin aut Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning. Osteosarcoma (dpeaa)DE-He213 Distal Femur (dpeaa)DE-He213 Host Bone (dpeaa)DE-He213 Myositis Ossificans (dpeaa)DE-He213 Parosteal Osteosarcoma (dpeaa)DE-He213 Alberghini, Marco verfasserin aut Thiesse, Philippe verfasserin aut Gambarotti, Marco verfasserin aut Bianchi, Giuseppe verfasserin aut Tranfaglia, Cristina verfasserin aut Vanel, Daniel verfasserin aut Enthalten in Clinical Sarcoma Research London : BioMed Central, 2011 1(2011), 1 vom: 25. Juli (DE-627)666217785 (DE-600)2623217-0 2045-3329 nnns volume:1 year:2011 number:1 day:25 month:07 https://dx.doi.org/10.1186/2045-3329-1-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 1 2011 1 25 07
allfields_unstemmed	10.1186/2045-3329-1-2 doi (DE-627)SPR031838286 (SPR)2045-3329-1-2-e DE-627 ger DE-627 rakwb eng 610 ASE Papathanassiou, Zafiria G verfasserin aut Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning. Osteosarcoma (dpeaa)DE-He213 Distal Femur (dpeaa)DE-He213 Host Bone (dpeaa)DE-He213 Myositis Ossificans (dpeaa)DE-He213 Parosteal Osteosarcoma (dpeaa)DE-He213 Alberghini, Marco verfasserin aut Thiesse, Philippe verfasserin aut Gambarotti, Marco verfasserin aut Bianchi, Giuseppe verfasserin aut Tranfaglia, Cristina verfasserin aut Vanel, Daniel verfasserin aut Enthalten in Clinical Sarcoma Research London : BioMed Central, 2011 1(2011), 1 vom: 25. Juli (DE-627)666217785 (DE-600)2623217-0 2045-3329 nnns volume:1 year:2011 number:1 day:25 month:07 https://dx.doi.org/10.1186/2045-3329-1-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 1 2011 1 25 07
allfieldsGer	10.1186/2045-3329-1-2 doi (DE-627)SPR031838286 (SPR)2045-3329-1-2-e DE-627 ger DE-627 rakwb eng 610 ASE Papathanassiou, Zafiria G verfasserin aut Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning. Osteosarcoma (dpeaa)DE-He213 Distal Femur (dpeaa)DE-He213 Host Bone (dpeaa)DE-He213 Myositis Ossificans (dpeaa)DE-He213 Parosteal Osteosarcoma (dpeaa)DE-He213 Alberghini, Marco verfasserin aut Thiesse, Philippe verfasserin aut Gambarotti, Marco verfasserin aut Bianchi, Giuseppe verfasserin aut Tranfaglia, Cristina verfasserin aut Vanel, Daniel verfasserin aut Enthalten in Clinical Sarcoma Research London : BioMed Central, 2011 1(2011), 1 vom: 25. Juli (DE-627)666217785 (DE-600)2623217-0 2045-3329 nnns volume:1 year:2011 number:1 day:25 month:07 https://dx.doi.org/10.1186/2045-3329-1-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 1 2011 1 25 07
allfieldsSound	10.1186/2045-3329-1-2 doi (DE-627)SPR031838286 (SPR)2045-3329-1-2-e DE-627 ger DE-627 rakwb eng 610 ASE Papathanassiou, Zafiria G verfasserin aut Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning. Osteosarcoma (dpeaa)DE-He213 Distal Femur (dpeaa)DE-He213 Host Bone (dpeaa)DE-He213 Myositis Ossificans (dpeaa)DE-He213 Parosteal Osteosarcoma (dpeaa)DE-He213 Alberghini, Marco verfasserin aut Thiesse, Philippe verfasserin aut Gambarotti, Marco verfasserin aut Bianchi, Giuseppe verfasserin aut Tranfaglia, Cristina verfasserin aut Vanel, Daniel verfasserin aut Enthalten in Clinical Sarcoma Research London : BioMed Central, 2011 1(2011), 1 vom: 25. Juli (DE-627)666217785 (DE-600)2623217-0 2045-3329 nnns volume:1 year:2011 number:1 day:25 month:07 https://dx.doi.org/10.1186/2045-3329-1-2 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 1 2011 1 25 07
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source	Enthalten in Clinical Sarcoma Research 1(2011), 1 vom: 25. Juli volume:1 year:2011 number:1 day:25 month:07
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The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. 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author	Papathanassiou, Zafiria G
spellingShingle	Papathanassiou, Zafiria G ddc 610 misc Osteosarcoma misc Distal Femur misc Host Bone misc Myositis Ossificans misc Parosteal Osteosarcoma Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases
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topic_title	610 ASE Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases Osteosarcoma (dpeaa)DE-He213 Distal Femur (dpeaa)DE-He213 Host Bone (dpeaa)DE-He213 Myositis Ossificans (dpeaa)DE-He213 Parosteal Osteosarcoma (dpeaa)DE-He213
topic	ddc 610 misc Osteosarcoma misc Distal Femur misc Host Bone misc Myositis Ossificans misc Parosteal Osteosarcoma
topic_unstemmed	ddc 610 misc Osteosarcoma misc Distal Femur misc Host Bone misc Myositis Ossificans misc Parosteal Osteosarcoma
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title	Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases
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title_full	Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases
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title_sort	parosteal osteosarcoma mimicking osteochondroma: a radio-histologic approach on two cases
title_auth	Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases
abstract	Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning.
abstractGer	Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning.
abstract_unstemmed	Objective Parosteal osteosarcoma is a well-differentiated variant of osteosarcoma that affects the surface of the bone. The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. A knowledge of this misleading pattern will help diagnose the lesion from the beginning.
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title_short	Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases
url	https://dx.doi.org/10.1186/2045-3329-1-2
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author2	Alberghini, Marco Thiesse, Philippe Gambarotti, Marco Bianchi, Giuseppe Tranfaglia, Cristina Vanel, Daniel
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up_date	2024-07-04T01:27:54.057Z
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The imaging pattern is very typical. We report two cases mimicking an osteochondroma, radiologically and histologically and propose an explanation. Material The review of 86 parosteal osteosarcomas of bone revealed this atypical pattern only once. A consultation case was received in the same time, and added to ours. Patients were 28 years old and 56 years old females. Imaging studies included two radiographs, two CTscans, one MRI examination and one bone scan and the results were compared to histology. Results On imaging, both lesions presented as ossified lobulated masses attached with a broad base to the underlying cortex. No radiolucent cleft separated the masses and the host bone and cortex continuity between the mass and the femur was seen, with medullary communication. The marrow of the mass had a different density and intensity compared to normal marrow. So, there were features of an osteochondroma (cortex and medullary continuity) and of a parosteal osteosarcoma (ossified marrow). Pathological assessment on the final specimen confirmed the presence of low-grade parosteal osteosarcomas, after an erroneous diagnosis of osteochondroma on the initial biopsy. Conclusions Parosteal osteosarcoma can be rarely confused with osteochondroma. A radiologic-pathologic correlation is essential. Cortex continuity is the most misleading imaging feature that may occur in parosteal osteosarcomas. 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Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases

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