Author Affiliation Disclosures John W. Karl, MD, MPH, Michael T. Krosin, MD, and Robert J. Strauch, MD Authors’ Disclosure Statement: The authors report no actual or potential conflict of interest in relation to this article. Abstract Isolated brachialis muscle atrophy, a rare entity with few reported cases in the literature, is explained by a variety of etiologies. We present a case of unilateral, isolated brachialis muscle atrophy that likely resulted from neuralgic amyotrophy. Isolated brachialis muscle atrophy has been rarely reported.

Among the few cases in the literature, 1 was attributed to a presumed compartment syndrome,1 1 to a displaced clavicle fracture,2 and 3 to neuralgic amyotrophy.3,4 We present a case of isolated brachialis muscle atrophy of unknown etiology, the presentation of which is consistent with neuralgic amyotrophy, also known as Parsonage-Turner syndrome or brachial plexitis. The patient provided written informed consent for print and electronic publication of this case report. Case Report A 37-year-old right-handed highway worker presented for evaluation of right-arm muscle atrophy. One year earlier, while lifting heavy bags at work, he felt a painful strain in his right arm, although there was no bruising or swelling. Approximately 4 weeks after this incident, he developed right shoulder pain and began to notice a slight decrease in the muscle mass of his right anterior arm.

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On evaluation at an outside facility, the physician noted some brachialis muscle atrophy. His shoulder pain was attributed to acromioclavicular joint problems. After an initial trial of physical therapy that did not alleviate this joint pain, an acromioclavicular joint resection was performed, and his pain improved. The brachialis muscle atrophy continued to progress, however. Over the course of the next 6 months, the patient noticed a continually decreasing muscle mass in his right arm, as well as arm fatigue with routine recreational activities. On follow-up, again at an outside institution, the treating physicians noted continued atrophy of the distal arm corresponding to the region of the brachialis musculature. Magnetic resonance imaging showed continuity of the brachialis muscle and tendon, with muscle atrophy.

Feb 14, 2019 - Isolated brachialis muscle atrophy has been rarely reported. Among the few cases in the literature, 1 was attributed to a presumed compartment.

The patient was able to return to work, although with a subjective decrease in right elbow flexion strength. On presentation at our institution, the patient complained of right arm weakness with heavy use but did not have pain or sensory complaints. His medical history was otherwise unremarkable.

Physical examination revealed obvious wasting of the right brachialis muscle, most notable on the lateral aspect of the distal arm ( Figures 1, 2A, 2B). His biceps muscle was functioning with full strength and had a normal bulk.

He had a normal range of active and passive motion, including full extension and flexion of both elbows, as well as complete pronosupination of the forearms. There was no focal tenderness. Manual muscle testing of both upper extremities was completely normal except for 4/5 flexion strength of the right elbow. Neurovascular examination also revealed normal findings, including intact sensation over the radiolateral forearm. A second magnetic resonance image showed that the brachialis muscle had completely atrophied. Because the clinical examination and imaging studies both indicated isolated brachialis atrophy without deficit elsewhere along the musculocutaneous nerve, electromyography was not performed. The patient was fully functional and working at his usual occupation, and no further intervention was recommended.