It is well known that the prolonged use of a crutch may induce a transitory musculospiral palsy, but damage to the main axillary vessels from the same cause appears to be an exceedingly rare phenomenon. Five years ago, a patient with obliteration of the axillary artery due to pressure by a crutch came under my observation, and several months later, a second patient was seen with an identical lesion. It was believed at first that these cases were probably unique, but later it was discovered that three similar cases had already been recorded: two by Ryle1 in 1922, and one by Souques and Terris in 1924.2 More recently, a fourth case has been described by Stricker3 from the Strasbourg University Surgical Clinic. In view of the undoubted rarity of "crutch thrombosis," it is considered worth while to add the following cases to those already on record. REPORT