Hariqbal Singh1, S K Khanna2, Vikas Rastogi3. 1. Senior Adviser, Department of Radiodiagnosis, Command Hospital (SC), Pune 411 040. 2. Advance Course Trainee, Department of Radiodiagnosis, Command Hospital (SC), Pune 411 040. 3. Senior Adviser, Dept of Radiodiagnosis, Army Hospital (R & R), Delhi Cantt - 110 010.