Deep venous thrombosis in a child: an unusual presentation of an osteochondroma.

Deep vein thrombosis is very uncommon in the pediatric population. We describe an unusual case of deep vein thrombosis caused by a femoral osteochondroma in a 13-year-old adolescent girl with known multiple hereditary exostoses. We discuss the optimum investigations to determine the site of venous obstruction, which is crucial when there are several osteochondromata in the affected limb, which could be implicated in causing the obstruction to venous flow.