Citation, DOI, disclosures and article data
Citation:
Siwach P, Knipe H, Moore C, Biker's nodule. Reference article, Radiopaedia.org (Accessed on 03 Jun 2023) https://doi.org/10.53347/rID-79605
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Radiopaedia Events Pty Ltd, Speaker fees (past)
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to
not be relevant to the changes that were made.
View Henry Knipe's current disclosures
Biker's nodule refers to a mass in the perineum that occur in cyclists.
Epidemiology
In keeping with bicycling being a male dominated recreational activity, the pathology is most commonly found in young-middle aged males, more commonly during first 6 to 12 months of taking up the sport.
Pathology
Chronic pressure and friction in perineal region between a bicycle saddle and inferior ischial tuberosities can result in delamination changes of fat in the ischiorectal fossae. Over a longer term in some cyclists, granulation tissue formation and fibrosis ensues.
Radiographic features
Depending on the state at which imaging is performed, the degree of edema, inflammation or fibrosis can vary, and so do imaging findings.
- 1. Köhler P, Utermann S, Kahle B, Hartschuh W. [Biker's Nodule"--Perineal Nodular Induration of the Cyclist]. Hautarzt. 2000;51(10):763-5. doi:10.1007/s001050051211 - Pubmed
- 2. Peters K, Luyten P, Monstrey S. Biker's Nodule : A Case Report and Review of the Literature. Acta Chir Belg. 2014;114(6):414-6. - Pubmed
- 3. Van de Perre S, Vanhoenacker F, Vanstraelen L, Gaens J, Michiels M. Perineal Nodular Swelling in a Recreational Cyclist: Diagnosis and Discussion. Skeletal Radiol. 2009;38(9):933-4. doi:10.1007/s00256-009-0731-9
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