1. bookVolume 4 (2021): Issue 1 (June 2021)
Journal Details
License
Format
Journal
eISSN
2544-8978
First Published
30 May 2018
Publication timeframe
1 time per year
Languages
English
access type Open Access

Posterior interosseous nerve entrapment by intramuscular lipoma arising from the supinator muscle - a case report

Published Online: 13 Aug 2021
Volume & Issue: Volume 4 (2021) - Issue 1 (June 2021)
Page range: 24 - 29
Accepted: 06 Jul 2021
Journal Details
License
Format
Journal
eISSN
2544-8978
First Published
30 May 2018
Publication timeframe
1 time per year
Languages
English
Abstract

Background: Lipomas are benign, slow-growing tumors frequently subcutaneous and asymptomatic, intramuscular lipoma constituting a rare subtype. However, a lipoma occurring nearby the proximal radius may cause posterior interosseous nerve (PIN) entrapment.

Case presentation: We described an uncommon case of a 45-year-old-man with a history of progressive, painless proximal right (dominant) forearm swelling for 4 months associated with PIN entrapment syndrome, presenting as fingers extension weakness. Intramuscular lipoma was observed in the supinator muscle in the magnetic resonance imaging (MRI). Lipoma surgical excision and release of the PIN through proximal forearm direct anterior approach was performed.

Results: The histopathological examination confirmed the diagnosis of benign intramuscular lipoma. The follow-up of the patient showed full recovery within three months postoperatively.

Discussion: Intramuscular lipoma is rare; however, it could originate from supinator muscle in the forearm, presenting with vague pain and could lead to compression of nearby neurovascular structures such as the PIN. Clinical evaluation and imaging studies, especially MRI, are crucial for diagnosis. If neural compression is evident, surgical resection is mandatory.

Conclusion: Intramuscular lipoma entrapping PIN is rare and requires early clinical diagnosis confirmed by imaging and neurophysiological studies, surgical excision being the method of choice for optimum functional outcomes.

Keywords

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