Osteochondroma of the medial malleolus: a case report

Abstract

Osteochondroma is the most common benign bone tumor. It is normally asymptomatic, and diagnosed incidentally. It rarely affects the ankle or foot, except in cases of Multiple Hereditary Exostoses. This study describes the clinical and radiographic characteristics of a solitary osteochondroma in the medial malleolus, the surgical treatment carried out, and the patient’s evolution after the procedure. A male patient, 13 years of age, with complaint of pain and increased volume in the medial region of the right ankle for one year. In the physical examination, the tumor was palpable over the medial malleolus, painful, but without affecting joint mobility. In the imaging exams, compromise of most of the medial malleolus was visualized. The treatment conducted was complete resection of the tumor, with reconstruction of the medal ligament. The sample was sent for diagnostic confirmation by histological study. At the three­-and-­a-­half year postoperative follow ­up visit, there were no signs of recurrence of the tumor, residual pain, or residual joint instability.