case_images: PMC7263134_01
case_images: Sagittal CT image of the caudal abdomen and pelvis. The arrows mark the limits of the rectal cyst (Cy). Note the compression of the rectum (R) by the mass, and the presence of faeces in the colon (Co)
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case_images: It measured 1.5 x 1.8 cm and was markedly compressing the rectum on its dorsal aspect (Figure 1).
case_images: (a) Image of the transanally exteriorised cyst held in place by two stay sutures; one oral (bottom of the image) and one aboral to the cyst (top of the image). (b) Dotted line showing the incision made on the cyst wall
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case_images: Two stay sutures were placed orally and aborally to the mass through the mucosal and submucosal layers (Figure 2a). A circumferential incision of the cyst wall was made with a scalpel blade #11 (Figure 2b).
case_images: In this image the cyst wall has been removed and the content of the cyst is exposed (dark red mass)
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case_images: Once the cyst wall was removed, the content of the cyst was exposed (Figure 3).
case_images: Image showing the defect on the rectal mucosa left after the cyst wall and the cystic content were removed and before suturing with an absorbable monofilament. The finger is in the rectum, the oral margin of the surgical incision is held exteriorised by the stay suture (bottom of the image). The aboral margin is also held by a stay suture (top of the image)
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case_images: The two edges of the rectal mucosa (Figure 4) were eventually sutured together by direct apposition with an absorbable monofilament (Polydioxanone size 4/0) suture on a round needle using a simple continuous pattern.
case_images: Histological section of the cystic wall. Three layers of normal rectum are present: mucosa (*), muscularis of the mucosa (black arrow) and submucosa (arrowhead)
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case_images: The cyst wall was similar to normal rectum as it presented a mucosa, muscularis of the mucosa and a submucosa (Figure 5).