The phlebographic demonstration of venous thrombosis occurring during the treatment of scoliosis.

The application of plaster casts to the trunk plays an important part in the management of severe scoliosis. The edge of these casts may impair venous drainage from the limbs and predispose to thrombosis, as in the three illustrative cases. A further case shows the possibility of a pelvic halo ring device causing similar venous compression. Steps should be taken to prevent this venous impingement from occurring, both at the time of case application and afterwards.