1. From the Departments of Radiodiagnosis and Interventional Radiology (S.G., A.G.) and Pathology (R.Y.), All India Institute of Medical Sciences, New Delhi, India; and Department of Radiology, Dr. B. R. Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, Room No. 160, New Delhi 110029, India (K.R., M.K.).