Unusual groin resistance--a case study.

Extraskeletal osteochondroma is a benign, cartilaginous, slow-growing tumor with typical location near the joints of hands, feet, and knees. The authors present the case of a 44-year-old patient who experienced increasing pain in the right groin. Two isolated calcium deposits formed an encapsulated mass in the iliopsoas muscle, and the extraskeletal osteochondroma was diagnosed. An unusual location required that the operation be performed by a vascular surgeon. The authors present a wide range of groin-resistance differential diagnoses.