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A large abdominal incision exposes abdominal and pelvic contents for pelvic exenteration (A). Contents of the lower abdominal cavity, including the rectosigmoid colon, prostate and seminal vesicles (if male), bladder, and any pelvic tumors are removed (B). (Illustration by GGS Inc.)

Bone marrow consists of red blood cells, white blood cells, and platelets (A). In a bone marrow transplant, bone marrow is harvested from the donor's pelvic bone at the iliac crest (B). The marrow is filtered (C) before being introduced into a large vein in the recipient's chest via a catheter (D). (Illustration by GGS Inc.)