Abstract
Multiple myeloma is considered to be the most common primary malignant bone tumor which has the flat bone as a predilection site in old ages. We experienced a case of an unsual multiple myeloma which formed a huge tumor mass on medial end of left clavicle. The tumor mass together with medial half of the clavicle was excised completely. We have discussed the rationale for the excision of the clavicle.