This case report describes a young female child presenting with a painful, expansile swelling at the medial aspect of her right thigh which had followed an open reduction internal fixation of a closed fracture of mid-shaft of right femur. An angiogram confirmed pseudoaneurysm of the superficial femoral artery probably caused by overpenetration of the drill bit or any sharp instrument while applying dynamic compression plate. It was treated surgically by resection of the aneurysm, reconstruction with inter-positional sephanous vein graft and removal of the hard-ware.