Dermoid cyst of the mediastinum is a rare, but definite, clinical entity. Each case observed should be reported as fully as possible, and because I have had the opportunity to study such a case and have operated successfully on the patient, I believe that a review of the literature, with conclusions as to diagnosis and treatment, will not be out of place.
From a study of the literature, I am led to believe that the only relief for the condition is surgical removal. Of the 119 cases reported, the condition has been found in the majority at autopsy. Beye's1 statistics show that fifty-seven, or 47 per cent, of the patients were operated on by drainage or removal. The majority of the cysts were drained and removed at subsequent operations. Of these fifty-seven cases, there was recovery in twenty-two instances, improvement in seventeen, death in twelve, and the outcome was