Radiographs of a pathological fracture

The patient is an 89-year-old male with metastatic prostate carcinoma. Anterior-posterior (AP) externally rotated view of the left humerus (A and magnified in B) reveal a permeative metastasis in the diaphysis with erosion of the medial cortex (arrow). Two months later, the patient presented with a complete transverse pathologic fracture through the lesion (C and magnified in D, with arrowhead).