title: Two unusual anatomic variations create a diagnostic dilemma in distal ulnar nerve compression.
abstract: Diagnosis of peripheral neuropathies is based upon patterns of functional deficits and electrodiagnostic testing. However, anatomic variations can lead to confounding patterns of physical and electrodiagnostic findings. Authors present a case of ulnar nerve compression due to a rare combination of anatomic variations, aberrant branching pattern, and FCU insertion at the wrist, which posed a diagnostic and therapeutic dilemma. The literature related to isolated distal ulnar motor neuropathy and anatomic variations of the ulnar nerve and adjacent structures is also reviewed. This case demonstrates how anatomic variations can complicate the interpretation of clinical and electrodiagnostic findings and underscores the importance of thorough exploration of the nerve in consideration for possible variations.
authors.affiliation: Department of Surgery, Division of Plastic and Reconstructive Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA. mwkiehn@gmail.com
authors.forename: Mark W
authors.initials: MW
authors.lastname: Kiehn
authors.forename: Allison J
authors.initials: AJ
authors.lastname: Derrick
authors.forename: Bermans J
authors.initials: BJ
authors.lastname: Iskandar
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D018482:Muscle, Skeletal / Q000033:anatomy & histology; D014459:Ulnar Nerve / Q000033:anatomy & histology*; D017769:Ulnar Nerve Compression Syndromes / Q000175:diagnosis* / Q000601:surgery