September 14, 2005
A 15-year-old boy had been experiencing pain in his distal left leg for 7 months. There was mild swelling, and an x-ray film of the lower leg revealed a sharply marginated, vertically oriented, tubular lucency in the metaphysis of the tibia (A). There was no cortical destruction, periosteal reaction, or pathologic fracture. An MRI at high field strength was performed to narrow the differential diagnosis.