Radiology Cases Round-cell tumours Reticulum cell sarcoma primary bone lymphoma

Description: These tumours as a bone present in the 3rd or 4th decades or later. Males have a greater frequency as much as 2x that of females. The sites of predilection are long bones and primarily diaphyseal affecting the medulla of the bone. The lesion is destructive and shows a patchy lytic pattern. 50% of cases may shown an overlying periosteal reaction. The tumour can be multifocal, particularly in an older age group. An extra-ossific soft tissue mass is unusual unless the bone involvement is secondary to an extra ossific primary. The tumour is classified as a primary bone ( non-hodgkin ) lymphoma and resembles the diffuse histiocytic lymphoma of lymph nodes.