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pouch were dissected away. The head of the tibia was found covered with more or less fibrous tissue. The semilunar cartilages seemed to be intact and not hypermobile. Both wounds were closed with fine silk in layers, subcutaneous catgut sutures and skin sutures of silk. The knee was immobilized in a heavy dressing, cotton rollers and a com¬ press bandage. The operation was done under the tourniquet. The pathologist reported a cavernous hemangioma apparently removed intact.The patient had a normal convalescence ; the stitches were removed on the seventh day. In May, 1925, the patient reported that she was free from all symptoms, using the knee without discomfort, and had had no return of trouble. CONCLUSIONS 1. In the diagnosis of "internal derangements" of the knee joint, the presence of hemangioma must be excluded, especially if the history indicates a long stand¬ ing disability or one resulting from trauma.2. It is most frequently found in children and young adults.3. Adequate roentgen-ray and radium treatment should be given before operative intervention is considered.4. The prognosis should be guarded. 5. Careful observation over a long period, after any form of treatment, should be insisted on.

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