A 45 year old retropositive man on regular medications came for his routine checkup
The frontal radiograph of the left shoulder shows a geographic lytic lesion with a narrow zone of transition in the glenoid portion of the left scapula. The lesion has a sclerotic rim and few thin bony septae within. There is no intra-articular extension. The joint space is normal.
MRI of the left shoulder shows expansion of the glenoid and the base of coracoid process with a T2 hyperintense lesion showing multiple T2 hypointense septae. Few areas of cortical breach are seen along the inferior margin of the lesion. There is adjacent PDFS hyperintense muscle edema. There is post contrast enhancement.
A CT guided biopsy was performed. IHC of the lesion showed diffuse positivity for CD38, CD138, MUM1, lambda and focal positivity for LCA and CD79a.