title: Periosteal chondroma of the ischium; an unusual location.
abstract: Periosteal chondroma is a rare benign tumor of hyaline cartilage. Periosteal     chondroma arising in the ischium is an extremely rare event. By presenting this     case report, we aim to remind that differential diagnosis of these lesions     should be carefully performed especially for unusual locations. A 51-year-old     man visited the orthopedics clinic with the complaints of left pelvic mass and     pain lasting about one year. Computed tomography showed a solid mass with     abundant specks of calcification that was 4x5 cm in diameter and associated with     the ischium of the left pelvic bone. There was no evidence of penetration into     the medullary cavity and cortical sclerosis. No radiological aggressive     appearance was observed. The lesion was removed with the covering periosteum.     Microscopically, there were lobules of hyaline cartilage composed of     chondrocytes with foci of endochondral ossification and calcification. The case     was reported as 'periosteal chondroma'. In conclusion, this case     report presents a case of periosteal chondroma, a rare tumor, which occurred in     an unusual location and age range. The differential diagnosis of periosteal     chondroma from malignant lesions is necessary for avoiding aggressive and     inappropriate treatment.
authors.affiliation: Department of Pathology, M.H. Diyarbakır Education and Research Hospital, Dİyarba kır, Turkey. bulentakansu@yahoo.com
authors.forename: Bülent
authors.initials: B
authors.lastname: Akansu
authors.forename: Esin
authors.initials: E
authors.lastname: Atık
authors.forename: Süleyman
authors.initials: S
authors.lastname: Altintaş
authors.forename: Aydıner
authors.initials: A
authors.lastname: Kalaci
authors.forename: Serefettin
authors.initials: S
authors.lastname: Canda
mesh_terms: D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D002812:Chondroma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D003937:Diagnosis, Differential; D006801:Humans; D051457:Hyaline Cartilage / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D007512:Ischium / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D014057:Tomography, X-Ray Computed