1. From the Department of Surgery, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
2. Address reprint requests and correspondence to Dr. A.H. Kardar: King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, MBC-83, Riyadh 11211, Saudi Arabia.
3. From the Department of Radiology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.