Rare rectal gastrointestinal stromal tumor case: A case report and review of the literature

Figure 1 Time axis of the patient’s detection of gastrointestinal stromal tumor and surgery treatment and postoperative follow-up.

Figure 2 Imaging examinations show the location of the rectal gastrointestinal stromal tumor. A: The colonoscopy results show that the tumor originated from the rectal dentate line; B: The results of trans-rectal ultrasound show that the tumor protruded from the posterior of the rectum submucosa; C and D: The results of pelvic magnetic resonance imaging revealed that the tumor (pentagram) was located in the rectum submucosa.

Figure 3 The presentation of gastrointestinal stromal tumor in transrectal ultrasonography and ultrasonic contrast. A: The presentation of gastrointestinal stromal tumor in transrectal ultrasonography; B: The overall enhancement is low. In the early stage of arterial, 16 S began to enhance; C: 32 S reached the peak and showed uneven low enhancement; D: 54 S began to clear; E: The venous phase showed low enhancement.

Figure 4 Transanal surgery with ultrasonic scalpel. A: Pre-operative patient photos; B: Intraoperative pictures; C: Excision with ultrasonic scalpel; D: Operative specimen.

Figure 5 Histopathology of the biopsy specimen. A and B: Histopathology showed that the cells were spindle-shaped and moderately differentiated (magnifications, × 100). C to F: Immunohistochemistry results showed that cluster of differentiation (CD) 34 (C), CD117 (D), Dog-1 (E), and CD34 (F) were all positive, and Ki67 was negative.