Coexistence of deep venous thrombosis and heterotopic ossification in the pediatric patient.

A 14-year-old girl and a 15-year-old boy with severe traumatic brain injuries were noted to have marked asymmetry in the lower extremities. Clinical and radiologic evaluation demonstrated the coexistence of deep venous thrombosis (DVT) and heterotopic ossification (HO). These cases demonstrate that although DVT are rare in children, they can be present and may coexist with the more common presentation of a swollen lower extremity secondary to HO.