Posterior interosseous nerve discontinuity due to compression by lipoma: Report of 2 cases

Andrés A. Maldonado, Benjamin M. Howe, Robert J. Spinner

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Paralysis of the posterior interosseous nerve (PIN) secondary to compression is a rare clinical condition. Entrapment neuropathy may occur at fibrous bands at the proximal, middle, or distal edge of the supinator. Tumors are a relatively rare but well-known potential cause. The authors present 2 cases of PIN lesions in which compression by a benign lipoma at the level of the elbow resulted in near transection (discontinuity) of the nerve. They hypothesize a mechanism - a "sandwich effect" - by which compression was produced from below by the mass and from above by a fibrous band in the supinator muscle (i.e., the leading edge of the proximal supinator muscle [arcade of Fröhse] in one patient and the distal edge of the supinator muscle in the other). A Grade V Sunderland nerve lesion resulted from the advanced, chronic compression. The authors are unaware of a similar case with such an advanced pathoanatomical finding.

Original languageEnglish (US)
Pages (from-to)1698-1701
Number of pages4
JournalJournal of neurosurgery
Issue number5
StatePublished - May 2017


  • Arcade of Fröhse
  • Compression
  • Palsy
  • Paralysis
  • Peripheral nerve
  • Posterior interosseous nerve
  • Radial nerve
  • Supinator

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology


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