Primary bone lymphoma can appear one X-ray with different patterns like solitary lytic lesion with sequestrum or diffuse area of mixed lytic-sclerotic areas with permatic pattern of bone destruction. On MRI, the presence of soft tissue mass and significant bone marrow involvement without extensive cortical destruction would highly suggest the diagnosis of primary bone lymphoma.  The patient underwent imaging guided biopsy and the histopathology result was:

"HIGH GRADE B CELL LYMPHOMA CONSISTENT WITH DIFFUSE LARGE B CELL LYMPHOMA".