CT of the abdomen shows multiple polypoid masses in the sigmoid colon

A 35-year-old man is brought to the emergency department by ambulance after having a tonicclonic seizure at work. The patient reports that he has always been healthy and has never had a seizure before. On further questioning, the patient reports that he has been having intermittent bloody stools for the past four months. CT of the head reveals an irregular 3-cm × 4-cm mass extending from the right to the left hemisphere. CT of the abdomen shows multiple polypoid masses in the sigmoid colon. Which of the following is the most likely diagnosis?

(A) Familial adenomatous polyposis
(B) Gardner syndrome
© Hereditary nonpolyposis colorectal carcinoma
(D) Tuberous sclerosis
(E) Turcot syndrome

Ans:(E) Turcot syndrome