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Related Experiment Video

Updated: Jun 22, 2026

Surgical Induction of Endolymphatic Hydrops by Obliteration of the Endolymphatic Duct

Surgical Induction of Endolymphatic Hydrops by Obliteration of the Endolymphatic Duct

Published on: January 22, 2010

Unexpected location of pilonidal sinuses.

N Sion-Vardy¹, L Osyntsov, E Cagnano

¹Department of Pathology, Soroka University Medical Center, Beer-Sheva, Israel.

Clinical and Experimental Dermatology

|June 3, 2009

Summary

Pilonidal sinuses, typically in the sacrococcygeal area, can occur in rare ectopic locations like the penis, scalp, abdomen, neck, groin, and axilla. Recurrent hair removal may be a contributing factor to these unusual presentations.

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Area of Science:

Dermatology
Surgical Pathology

Background:

Pilonidal sinuses commonly affect the sacrococcygeal region, predominantly in young males.
Ectopic presentations of pilonidal sinuses are infrequent but documented.

Purpose of the Study:

To review and document unusual locations of pilonidal sinuses over a four-year period.
To investigate potential etiological factors for ectopic pilonidal sinus development.

Main Methods:

Retrospective case review of pilonidal sinus presentations.
Analysis of lesion locations and patient history, including hair removal practices.

Main Results:

Identified unusual pilonidal sinus sites: penis (1), scalp (2), abdomen (2), neck (1), groin (2), and axilla (2).
Abdominal and penile locations are uncommon; groin presentation is reported for the first time.
Recurrent hair removal was a common factor among patients with ectopic pilonidal sinuses.

Conclusions:

Pilonidal sinuses can manifest in rare ectopic sites beyond the sacrococcygeal area.
Recurrent hair removal is a potential initiating trauma for ectopic pilonidal sinus formation.
Further research is warranted to understand the pathogenesis of these rare presentations.