A 54-year-old man was referred to our hospital because of lower abdominal discomfort.
Total colonoscopic examination was performed and four protruding yellow-white lesions,
6 mm or less in diameter, were detected in the rectum (Figure [1]
a). At endoscopy it was suspected that these lesions were rectal carcinoids and this
diagnosis was confirmed by histological examination of biopsy specimens. Endoscopic
ultrasonography demonstrated that the carcinoid tumors were localized within the submucosal
layer (Figure [1]
b). Abdominal ultrasonography and computed tomography did not show any evidence of
abdominal lymph node swelling or of metastatic lesions in the liver.
Figure 1 Rectal carcinoid tumors. a Endoscopic appearance before resection. b Endoscopic ultrasonogram before resection. c Mucosal resection of a carcinoid nodule (arrow) using an esophageal variceal ligation
device. d Endoscopic view after resection.
Repeat endoscopy was performed for endoscopic mucosal resection of the rectal carcinoid
nodules. The usual endoscopic mucosal resection technique was used to resect the 6-mm
nodule, after lifting the mucosa by injecting hypertonic saline-epinephrine (50 µg/ml)
into the submucosa adjacent to the tumor. To resect the other three nodules, for each
of them, the mucosa was first lifted by submucosal injection of hypertonic saline-epinephrine,
the elevated mucosa, containing the small nodule was ligated using an esophageal variceal
ligation device and resected using an endoscopic snare device (Figures 1c and 1d). Histological examination showed rectal carcinoids with a ”festoons and ribbons”
pattern, with clear resection margins (Figure 2).
Figure 2 Histological appearance (a × 20, b × 100) of carcinoid tumor infiltrating the submucosal layer. The resection margins
were free of tumor.
Rectal carcinoids are relatively uncommon lesions, representing only 1.3 % of all
rectal tumors [1]. They usually present as small solitary nodules and multicentricity is rare, occurring
in only a few percent of cases [2]
[3]. The present treatment guidelines for rectal carcinoids are controversial, but seem
to be based on tumor size and depth of invasion. Most would agree that small lesions
of less than 10 mm can be adequately treated by endoscopic resection or local excision
[2]
[3]
[4]. The band ligation method has been applied to treat early esophageal, gastric, and
colonic neoplasms. Using this method, we achieved complete local resection of multiple
rectal carcinoids. Previous studies suggest that complete local resection of carcinoid
tumor is associated with a low rate of local recurrence [2]
[5]. This method seems to be useful for the resection of small carcinoid tumors of the
rectum.
Endoscopy_UCTN_Code_TTT_1AQ_2AD
