Unexpected location of pilonidal sinuses

Abstract

Pilonidal sinuses usually occur in the sacrococcygeal area in young men, and occasionally can be found in other ectopic sites. We present a retrospective case review on unusual locations of pilonidal sinuses in the past 4 years. The lesion sites were as follows: one on the penis, two on the scalp, two on the abdomen, one on the neck, two in the groin and two in the axilla. Abdominal and penile lesions are uncommon, but the other locations reported are unusually rare. To our knowledge, the groin has not been reported previously as a site of a pilonidal sinus, although the histological appearance of hidradenitis suppurativa may well resemble it. When trying to clarify the pathogenesis of these occurrences, we found that recurrent hair removal was a common characteristic of the patients we contacted, and this may have been the initiating trauma.

Morphology of Pilonidal Sinus Disease: Some Evidence of Its Being a Unilocalized Type of Hidradenitis Suppurativa

“…In an earlier series of HS patients, we found that 82% (49/60) showed multiple localizations; 18% (9/49 patients) of them suffered from lesions in the perianal/coccygeal region [33]. In these cases, the clinical diagnosis of HS was evident because other typical areas were involved; thus, consideration of PS or ‘atypical’ PS (as already reported earlier [22]) did not arise. Hence, PS could be regarded as a monolocalized form of HS.…”

“…(3) The presumed entity PS was also recognized in areas other than the sacrococcygeal region [21], especially in further regions with skin folds [10,22]. Hence, the idea arises that PS has considerable similarity or even identity to HS.…”

Back and Face Involvement in Hidradenitis Suppurativa

“…There are also no terminal hairs, but typical localizations (such as the intermammary folds in women) also lack terminal hairs, which do not seem to be an anatomical requisite of HS lesions. Atypical locations of pilonidal sinuses (a lesion frequently associated with HS) have been described, including lesions of the groin reminiscent of HS [15]. …”

Axillary Pilonidal Siınus of a Hirsute Woman

“…Sion-Vardy et al mentioned in their study about that the related previously reported cases were non-hirsute healthy women, aged 17-30 years. However, our presented case in November 2009 is a hirsute 25-year-old woman [4].…”