Extension of the lesion the mass projects from the main humeral shaft in anterolateral direction. The most superior margin of the mass is approximately 1 cm. inferior to the physis or about 3 cm. inferior to the tip of greater tuberosity of the right humerus. The most inferior margin is at the deltoid ridge insertion of the deltoid muscle. Lesic protrudes into and compresses the adjacent deltoid muscle without associated muscle edema. there is no intraarticular extension. No skipped lesion. The neurovascular bundles are intact.