<prompt> All are rare manifestations of carcinoid syndrome except:Retroperitoneal fibrosisPeyronies disease of the penisOcclusion of the mesentric aeriesSteatorrhea  <response>: Diarrhea is present in 68-84 at some time in the disease course. Diarrhea usually occurs with flushing. Steatorrhea is present in 67. So steatorrhea is not a rare manifestation. Rare manifestations of Carcinoid syndrome includes retroperitoneal fibrosis causing urethral obstruction, Peyronies disease of the penis, intraabdominal fibrosis, and occlusion of the mesenteric aeries or veins. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 3062 