DefinitionThis section has been translated automatically.
Rare, benign induration of the subcutaneous tissue in the perineal area as a result of repetitive local pressure and/or vibration, e.g. from bicycle saddles.
Occurrence/EpidemiologyThis section has been translated automatically.
Mainly for cycling with high annual mileage. Overall rarely, exact data are missing. Probably clearly underdiagnosed.
In a study of extensive mountain biking 94% of the subjects showed sonographic abnormalities, in the control group only 16% (Frauscher F et al.).
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EtiopathogenesisThis section has been translated automatically.
Microtrauma by repetitive local pressure / vibration. Resulting collagen degeneration, myxoidal changes and low cell fibroblast proliferation ((Köhler P et al., Khedaoui R et al.).
Clinical featuresThis section has been translated automatically.
Subcutaneous induration in the perineal area. Mostly unilateral, sometimes bilateral. Initially often recurrent, in the course of time persistent (Scheiba N et al. 2020)
Differential diagnosisThis section has been translated automatically.
TherapyThis section has been translated automatically.
Pressure relief, e.g. through cycling leave, alternatively ergonomic, soft saddle, changed riding position, recumbent bike.
In the case of pronounced findings, intralesional corticosteroids or hyaluronidase may be used.
Operative removal possible, cave recurrence due to poor pressure distribution with scarring possible.
LiteratureThis section has been translated automatically.
- Frauscher F et al (2001) US findings in the scrotum of extreme mountain bikers. Radiology 219:427-31.
- Köhler P et al (2000) "Biker's nodule" - the perineal nodular induration of the cyclist. Dermatologist 51:763-5.
- Khedaoui R et al (2014) Perineal nodular induration ("Biker's nodule"): report of two cases with fine-needle aspiration cytology and immunohistochemical study. Int J Surg Path. 22:71-5.
- Scheiba N et al (2020) Perineal nodules caused by bicycling. Dtsch Arztebl Int 117:100.
Outgoing links (4)Abscess, periproctitic; Adnexal tumors with apocrine differentiation; Epidermal cysts on scrotum and vulva; Lipoma (overview);
Please ask your physician for a reliable diagnosis. This website is only meant as a reference.