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Intracapsular Chondroma of the Knee: An Unusual Neoplasm

Intracapsular chondroma is a rare lesion that has been reported under different names on 23 occasions. We describe a 52-year-old woman with intracapsular chondroma that involved the left knee. Radiologically, the mass was multilobulated, calcified, and sharply circumscribed and was lying between the patella and the anterolateral surface of the tibia. The peculiar histologic pattern of the tumor was composed of hyaline cartilage nodules with enchondral ossification or calcification, in apparent transition with septa of connective and adipose tissue. The most common differential diagnoses for this tumor are primary synovial chondromatosis and chondrosarcoma. We emphasize a possible metaplastic origin of the chondromatous component due to some mechanical posttraumatic disturbance of the infrapatellar fat pad. To our knowledge, the present case is the second intracapsular chondroma to be described in the European literature.