Chondroblastoma: A Rare Bone Tumor Presenting at Unusual Age at an Unusual Site

Abstract

Chondroblastoma is rare benign bone tumor of cartilaginous origin that accounts for less than 1 % of all bone tumors. It usually develops in immature skeleton in the second decade of life and has a slight male preponderance. Approximately 75% cases of chondroblastoma involve epiphysis of long bones. Phalanges are a rare site for chondroblastoma. Here we report the case of a 68 year old female with Chondroblastoma of right ring finger whose age and site are unusal for a diagnosis of chondroblastoma. Based on CT findings the two diagnostic possibilities considered were namely, Bizzare parosteal osteochondromatous proliferation and Glomus tumor. The diagnosis of chondroblastoma in this rare location was made based on pathological evaluation of the specimen. So always keep in mind that rare presentation at a rare site is a possibility.