Diagnosis of a submucosal mass at the staple line after sigmoid colon cancer resection by endoscopic cutting-mucosa biopsy

Figure 1 Endoscopic view of a 10 mm submucosal mass in the lower rectum located 15 cm from the anal verge at the staple line of a previous anastomosis.

Figure 2 Endoscopic ultrasonography showed a well-circumscribed submucosal tumor with a hyper-echoic appearance.

Figure 3 Un-enhanced and intravenous contrast-enhanced computed tomography scans of the abdomen show a slightly hyperdense mass in the rectal wall without contract enhancement (white arrow). A: Unenhanced CT; B: Contrast enhanced CT. CT: Computed tomography.

Figure 4 A cruciate incision over the lesion with the cutting needle knife technique revealed soft, white submucosal tissue. The wall of the cavity was left intact.