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First case  Previously health 12 year old boy, noticed swelling above his left ankle. Initially he was not disturbed with this as it was not painful and did nt limit his play and activities. Later he had minimal pain on brisk walking  and he observed swelling was gradually  increasing in size. He came to us three months after the onset. He did nt have  fever. No similar swelling anywhere else. He did nt have other symptoms like fatigue ,syncope bleeding manifestations. No family history of similar swelling on the body. On examination  Diffuse swelling on the medial aspect of lower limb, 4 X 4 cms. Surface normal ,there was no discoloration. No other swelling anywhere. No pallor  No lymph nodes. As the swelling was growing over the last three months we considered the possibility of malignancy.  We did a Plain X-Ray lower leg and foot AP and Lateral Differential diagnosis of lytic lesions of bone considered .   Within next three days pain increased and the sw