Multiple myeloma, right lower extremity and back pain There are multiple foci of abnormal marrow signal scattered throughout the pelvis and proximal femora consistent with history of multiple myeloma. When compared to a prior MRI of 5/24/2016, these lesions have progressed in size and number. There is now a confluent lesion involving the majority of the right sacrum measuring at least 6.2 x 4.6 x 8.1 cm in the greatest transaxial and craniocaudal dimensions. This particular lesion obliterates a portion of the S1 nerve root as well as the majority of S2.The visualized soft tissues are normal in signal intensity.
Diffuse myelomatous involvement of the pelvis which is progressed from the prior exam. There is a confluent expansile lesion involving the right sacrum which obliterates portions of the S1 and S2 nerve roots.