case_images: PMC9529652_01
case_images: (A) CT imaging demonstrating right rectal wall mass measuring 4.8 cm AP x 4.1 cm transverse; (B) CT imaging 3 months later demonstrating marked decrease in tumor size to a soft tissue rectal wall prominence.
case_images: jchim-12-05-093f1.jpg
case_images: PMC9529652_01_jchim-12-05-093f1.jpg
case_images: f1-jchim-12-05-093
case_images: As part of workup, he underwent a CT abdomen/pelvis which showed an incidental finding of a 4.8 cm mass arising from the right mid-rectal wall (Fig. 1A). Follow-up imaging 3 months later showed a marked decrease in tumor size down to a residual soft tissue prominence (Fig. 1B).
case_images: Endoscopy image demonstrating erythematous nodular friable mass in the rectum.
case_images: jchim-12-05-093f2.jpg
case_images: PMC9529652_01_jchim-12-05-093f2.jpg
case_images: f2-jchim-12-05-093
case_images: To evaluate the rectal mass, a colonoscopy was performed which revealed erythematous nodular friable mucosa located in the proximal rectum about 13 cm from the anal verge, with normal intervening mucosa between the anal canal and the lesion (Fig. 2).
case_images: H&E stain (10x) showing SCC on the surface and columnar colorectal mucosa (crypts) in the lamina.
case_images: jchim-12-05-093f3.jpg
case_images: PMC9529652_01_jchim-12-05-093f3.jpg
case_images: f3-jchim-12-05-093
case_images: Biopsy results revealed a diagnosis of SCC(Fig. 3).