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Endoscopic Approach for Colloid Cyst Resection

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Published on: May 23, 2025

Unusual presentation for a tailgut cyst.

Daniel Hancu¹, James Williams², Faris Kubba³

¹Department of General Surgery, North West London Hospitals NHS Trust, London, UK dannyyro@yahoo.com.

BMJ Case Reports

|April 26, 2017

Summary

A rare tailgut cyst, an embryological remnant, was found externally at the anorectal junction. Complete surgical resection is recommended due to its potential for malignancy.

Keywords:

Gastrointestinal surgery General surgery

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Area of Science:

Colorectal Surgery
Surgical Pathology
Embryology

Background:

Tailgut cysts are rare developmental anomalies originating from the embryonic hindgut.
They typically present as retrorectal masses but can occur in other locations.
This case highlights an unusual external presentation at the anorectal junction.

Observation:

A 67-year-old male presented with an asymptomatic perianal lesion initially suspected to be a colonic polyp.
Intraoperative findings revealed a cystic lesion with unusual contents, prompting further investigation.
Histological examination confirmed the diagnosis of a tailgut cyst (cystic hamartoma).

Findings:

Tailgut cysts are generally benign but possess rare malignant potential.
Complete surgical excision is the standard treatment to ensure definitive diagnosis and prevent recurrence.
External anorectal junction location is exceedingly rare, with only two prior reported cases.

Implications:

This case underscores the importance of considering tailgut cysts in the differential diagnosis of perianal lesions.
Accurate diagnosis through histological examination is crucial for appropriate management.
Awareness of rare presentations aids clinicians in surgical planning and patient care for these embryological remnants.