13, years old boy, the LEAST common cause of proximal lytic lesion of the head of the femur is -: (A) Plasmacytoma, (B) Metastasis, (C) Histiocytosis, (D) Bone tumour
Answer is A. If multiple myeloma occurs as a solitary lesion it is known as Plasmacytoma
Age gp is 6th-7th decade, Rare before 40yrs of age
So the lytic lesion in a 13 yrs old boy cannot be a plasmacytoma