Objective:

To explore the value of transrectal ultrasonography (TRUS) in the diagnosis of rectal carcinoid and assisted transanal endoscopic microsurgery (TEM).

Methods:

Between January 2015 and December 2016

the data of 65 patients with rectal protuberant lesions were collected. Miniprobe sonography (MPS)

colonoscopy

TRUS and pathologic examinations were performed. The TRUS images of rectal carcinoid confirmed by pathology were analyzed to find out the characteristics. The accuracies of colonoscopy

TRUS and MPS in diagnosing rectal

carcinoid were compared. TRUS was applied to localize the lesions before TEM

discover the postoperative surgical complications and follow up.

Results:

The TRUS characteristics of rectal carcinoid includes well-defined boundary

homogeneous echo

hypoechoic nodules with rich blood supply in the submucosa. TRUS had a highaccuracy rate of 96.9% in the diagnosis of rectal carcinoid

similar with MPS (95.4%)

and superior to colonoscopy (81.5%). TRUS was of great value in the preoperative localization of rectal carcinoid

the detection of postoperative complications and follow up.

Conclusion:

TRUS has a high diagnostic value for rectal carcinoid

as good as MPS

and can be used as the first-choice imaging method for TEM.