Parosteal osteosarcoma of the orbit.
A 60-year-old woman was referred to Bristol Eye Hospital because of a progressive, painless, right proptosis. CT revealed a well-defined, hyperdense lesion adjacent to the lateral orbital wall. A marginal excision was performed. The mass was stony-hard, lobulated, and encapsulated. Histopathologic findings were consistent with a low-grade parosteal osteosarcoma. Parosteal osteosarcoma is a rare osteogenic tumor that usually affects the long bones. It represents a malignant, though well differentiated, tumor that has a relatively good prognosis after a wide excision. However, local recurrences are not rare and have been associated with dedifferentiation. The latter affects the prognosis adversely and, thus, regular follow-ups are strongly suggested after the initial tumor excision. In the present case, no further treatment was administered and the patient was reported disease free 26 months after surgery.
Chalvatzis
Nikolaos T
NT
Bristol Eye Hospital, Bristol, United Kingdom. nikocha@hotmail.com
Kalantzis
George
G
Manthou
Maria-Eleni
ME
Collins
Chris
C
Potts
Michael J
MJ
D005260:Female; D006801:Humans; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D018217:Osteosarcoma, Juxtacortical / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed