A 48 Year Old Man Became Alarmed When He Noted

Multiple Choice

A 48 year old man became alarmed when he noted some bright red blood in his stool.He consulted a local physician,who palpated an indurated area (firm to touch) in the patient's rectum.Surgery was performed,and a representative section of the surgical specimen is show on low power in the accompanying photomicrograph.Which one of the following is the best diagnosis?

A) Adenomatous polyp
B) Invasive adenocarcinoma
C) Tubulovillous adenoma
D) Ulcerative colitis
E) Villous adenoma