Chao P W, Farman J, Kapelner S
J Comput Assist Tomogr. 1986 Jul-Aug;10(4):684-5. doi: 10.1097/00004728-198607000-00029.
A case of beta-thalassemia with an unusual focus of extramedullary hematopoiesis is reported. The presacral area was involved producing a significant mass effect on the rectum.