REPORT OF CASE
F. L., a boy, aged 12, referred by Dr. Carroll DeCourcy, was admitted to the Seton Hospital, Jan. 13, 1918, with a fracture of the upper third of the left humerus, due to his having slipped on an icy pavement when coming home from school. Examination of the arm by palpation elicited an elongated, bony swelling in the upper third of the humerus, with point tenderness, crepitation and mobility at the corner of the swelling. The patient gave a history of having been vaccinated ten months previously, the reaction following the vaccination having been very severe. Whether the vaccination was a causative factor, is uncertain. For the last ten months the patient had continually complained of dull, rheumatic pains in the upper part of his arm, and was treated by medication and by external applications without relief.The roentgenogram secured at the time of his admission to