Popliteal artery pseudoaneurysms are a rare vascular complication of osteochondroma. A 19-year-old male with osteochondroma had a painful pulsatile mass in the left thigh. Ultrasonography and CT angiography demonstrated a popliteal artery aneurysm and osteolytic change in the femur in the area contacting the aneurysm. The bottom of the pseudoaneurysm was missing the capsule and was continuous with the bone marrow of the femur through a cortical bone defect. The popliteal artery was partially resected, leaving 1 cm, and anastomosed end-to-end. After the operation, the pain improved rapidly, and lower limb blood supply was maintained. Three years after surgery, no recurrence of the pseudoaneurysm was noted. We report a rare case of a pseudoaneurysm that penetrated the femur in the left thigh of a patient with multiple osteochondromas.
