Well-differentiated extraskeletal osteosarcoma. A soft-tissue homologue of parosteal osteosarcoma.
We describe a unique case of a low-grade extraskeletal osteosarcoma revealing both histologic and radiologic features reminiscent of parosteal osteosarcoma. The tumor, which had been present for 10 years, occurred in the left axilla of a 74-year-old black woman. To date, all the published cases of extraskeletal osteosarcoma have been high-grade neoplasms; to our knowledge, this is the first reported case of a low-grade extraskeletal osteosarcoma.
Department of Pathology, Washington Hospital Center, Washington, DC.
E S
ES
Yi
B M
BM
Shmookler
M M
MM
Malawer
D E
DE
Sweet
D000368:Aged; D000792:Angiography; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D012516:Osteosarcoma / Q000000981:diagnostic imaging / Q000473:pathology*; D012782:Shoulder / Q000000981:diagnostic imaging; D012983:Soft Tissue Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*