Metastatic adenocarcinoma of the prostate: presentation as a pleural-based mass

We have presented an unusual case of metastatic prostate carcinoma simulating a primary bone tumor. Although previous reports have described periosteal and "pseudosarcomatous" prostate metastases, no report makes reference to rib involvement. Furthermore, the large soft tissue component is highly unusual. This case illustrates that although such lesions are rare, in the older patient, metastases should be included along with primary tumors in the differential diagnosis of a spiculated bone lesion with prominent soft tissue involvement.