Atypically localized glomus tumor causing anterior interosseous nerve syndrome: A case report

Abstract

This article presents a 48-year-old male patient who presented with pain in the left forearm and weakness and clumsiness in the left hand of 6 months' duration. Flexor motor strength loss of the thumb and the index finger was present and neurophysiologic tests showed findings compatible with axonal injury in the anterior interosseous nerve (AIN) innervated muscles. Magnetic resonance imaging revealed a space-occupying lesion in the proximal forearm resembling a glomus tumor. Excision of the mass and release of the AIN were performed. Histopathology confirmed a glomus tumor, and the patient remains asymptomatic at 1 year postoperatively. We stress the importance of imaging studies in patients when a suspected secondary nature of nerve entrapment is present.

Proximal Median Nerve Compression in the Differential Diagnosis of Carpal Tunnel Syndrome

“…In determining the aetiology of AINS, magnetic resonance imaging (MRI) might be useful to differentiate between NA and compression and to identify rare tumors in atypical cases [ 58 , 70 , 74 , 75 ]. Fascicular (or hourglass) constrictions of unknown origin, potentially trauma, inflammation, or autoimmune, are a common finding in recent imaging and surgical studies of AINS, suggesting neuritis such as NA.…”

Lacertus Fibrosus Syndrome: A Case Report

“…If sufficiently severe, transitions in muscle perfusion and nerve caliber can aid in the diagnosis of median nerve neuropathies [6][7][8][9]. In atypical scenarios, magnetic resonance imaging (MRI) may be valuable in differentiating between compression and neuralgic amyotrophy and also in detecting rare tumors [10][11][12][13]. Fascicular (or hourglass) constrictions of atypical cause, possibly due to trauma, inflammation, or an inflammatory condition, are recurrent findings in anterior interosseous nerve syndrome, suggesting neuritis.…”