There are abnormal well defined heterogenously enhancing lobulated soft tissue lesions of altered signal intensity along the right iliac blade, bilateral ischium and left femoral diaphysis.. The lesion is causing cortical erosion of the adjacent iliac bone .The lesion appears hypointense on T1W , heterogenously hyperintense on T2 and STIR.
The visualised muscles, bones and rest of the pelvic organs are normal.
The imaging features of the skull, pelvic bones and femoral lesions are most likely suggestive of Langerhans cell histiocytosis