<prompt> 13, years old boy, LEAST common cause of proximal lytic lesion of head of femur is:PlasmacytomaMetastasisHistiocytosisBone tumour  <response>: Ans. is a Plasmacytoma If multiple myeloma occurs as a solitary lesion it is Ka PlasmacytomaAge gp is 6th-7th decade, Rare before 40yrs of ageSo the lytic lesion in a 13yrs old boy cannot be a plasmacytoma 