Abstract

Malignant tumors of the colon usually originate from benign adenomas. Adenomas with large size and villous component have higher malignancy potential than other adenomas. Adenomas are usually asymptomatic, but as their size increase, they may cause symptoms such as bleeding, tenesmus, obstruction, intussusception. Mucous diarrhea can be seen due to secretory adenomas that constitute the subgroup of villous adenomas. Secretory adenomas are usually located in the rectosigmoid region and are larger than 4 cm. McKittrick-Wheelock syndrome is characterized by chronic mucous diarrhea, renal failure and electrolyte imbalance due to rectal secretory villous adenoma. Approximately 100 cases have been reported in the literature. Adenoma causing McKittrick Wheelock syndrome carries a hıgh rısk for the development of ınvasıve cancer due to its bıg sıze and hıstologıc sub-type. This syndrome can be fatal due to the metabolic collapse or possible malignancy however early diagnosis and proper treatment may increase quality of life and serve a significant survival advantage for the patients. The importance of being aware of McKittrick-Wheelock syndrome and the need to include this diagnosis in the work up of patients with secretory diarrhea should be highlighted.In this case report, we aimed to present a patient who was diagnosed with rectal cancer and was diagnosed as one of the largest adenomas causing McKittrick-Wheelock syndrome.