case_images: PMC10901039_01
case_images: Axial abdominal CT scan showing a well-defined mass with heterogeneous enhancement arising from the third part of the rectum.
case_images: cureus-0016-00000053140-i01.jpg
case_images: PMC10901039_01_cureus-0016-00000053140-i01.jpg
case_images: FIG1
case_images: The mass appeared to be arising from the anterior rectal wall and was associated with multiple adjacent prominent lymph nodes (Figure 1).
case_images: Abdominal MRI (T1-weighted images). (A) A T1 hypointense mural rectosigmoid mass. (B) A heterogeneous enhancement with areas of cystic changes on the post-contrast study.
case_images: cureus-0016-00000053140-i02.jpg
case_images: PMC10901039_01_cureus-0016-00000053140-i02.jpg
case_images: FIG2
case_images: The findings suggest a GIST as the most likely diagnosis (Figures 2, 3).
case_images: Abdominal MRI: T2-weighted image shows a T2 hyperintense mural rectosigmoid mass.
case_images: cureus-0016-00000053140-i03.jpg
case_images: PMC10901039_01_cureus-0016-00000053140-i03.jpg
case_images: FIG3
case_images: The findings suggest a GIST as the most likely diagnosis (Figures 2, 3).
case_images: Gross picture showing the exophytic mass in the distal sigmoid.
case_images: cureus-0016-00000053140-i04.jpg
case_images: PMC10901039_01_cureus-0016-00000053140-i04.jpg
case_images: FIG4
case_images: Intra-operative findings revealed a 10 x 5 cm exophytic bilobed mass in the distal sigmoid (Figure 4), with no mesenteric lymph nodes observed.
case_images: (A) Nuclear palisading is common in the cellular areas. The "nuclear-free zones" that lie between the nuclear palisades are called Verocay bodies (hematoxylin & eosin stain, 20x). (B) The tumor cells are immunoreactive for S100.
case_images: cureus-0016-00000053140-i05.jpg
case_images: PMC10901039_01_cureus-0016-00000053140-i05.jpg
case_images: FIG5