TY - JOUR AU - Cannoni, Luiz Fernando; Haddad, Luciano TI - Anconeus Epitrochlearis Muscle as a Cause of Ulnar Nerve Compression at the Elbow TT - Músculo anconeu epitroclear como causa de compressão do nervo ulnar no cotovelo SN - 0103-5355 SN - 2359-5922 PY - 2017 JF - Arquivos Brasileiros de Neurocirurgia: Brazilian Neurosurgery LA - EN VL - 36 IS - 03 SP - 190 EP - 193 ET - 2017/08/28 DA - 2017/09/08 KW - ulnar nerve disease KW - ulnar neuropathy AB - Ulnar nerve entrapment is the second most common compressive neuropathy in the upper limb, after carpal tunnel syndrome (Dellon, 1986). One of the causes that must be considered is the accessory anconeus epitrochlearis muscle, which is present in 4% to 34% of the general population (Husarik et al, 2010; Vanderpool et al, 1968; Nellans et al, 2014).We describe a patient with symptoms of compression of the left ulnar nerve at the elbow and the result of the surgical treatment.The patient presented with hypoesthesia in the fourth and fifth fingers of the left hand, and reduction of strength in the fifth finger abduction. No alterations were found in the thumb adduction.Initially, the treatment was conservative (splint, physiotherapy, analgesics); surgical treatment was indicated due to the continuity of the symptoms.The ulnar nerve was surgically released and transposed, with complete recovery after 6 months of follow-up.Ulnar nerve entrapment at the elbow by the anconeus epitrochlearis muscle is not common, but it must not be ignored (Chalmers, 1978). Ultrasonography (Jung et al, 2013; Bargalló et al, 2010), elbow magnetic resonance imaging (MRI) (Jeon, 2005), and electromyography (Byun, 2011) can help establish the proper diagnosis. PB - Thieme Revinter Publicações Ltda DO - 10.1055/s-0037-1606276 UR - http://www.thieme-connect.com/products/ejournals/abstract/10.1055/s-0037-1606276 ER -