Wirst musculature anatomic variation associated with Guyon’s canal syndrome: a case report

• Autor(a) principal: Gonçalves de Jesus Filho, Arnaldo
• Data de Publicação: 2021
• Outros Autores: Meireles Azevedo Pereira, Gabriel, Vitor Pires Duque, Marcos, Chaves de Almeida, Arthur, Machado Talma, Ana Júlia
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: HU Revista (Online)
• Texto Completo: https://periodicos.ufjf.br/index.php/hurevista/article/view/35457
• topic: Guyon Syndrome; Ulnar Nerve Compression; Anatomic Variation; Síndrome de Guyon; Compressão do nervo ulnar; Variação anatômica

Introduction: Guyon's canal syndrome is the ulnar nerve compressive neuropathy at the level of the wrist, and one of its rarer etiologies is the presence of anomalous muscles crossing Guyon's canal. Objective: To report a case of a patient with Guyon's syndrome caused by the presence of accessory little finger abductor muscle. Case Report: The patient presented with a clinical presentation of paresthesia and pain in the 4th and 5th fingers of the right upper limb and positive Wartenberg and Egawa tests. After ultrassonography and eletroneuromyography, the presence of ulnar nerve compression at the wrist level (Guyon's syndrome) and also at the elbow level were demonstrated. During surgical treatment, anatomical variation of the acessory abductor little finger muscle was observed, which was anomalously crossing Guyon's canal, causing the compression of the ulnar nerve. After the procedure, the patient showed improvement in symptoms and progressed well with physical therapy. Conclusion: The presence of abnormal muscles can be the cause of compressive neuropathies. Through the case reported, it contributes to the dissemination of this knowledge about these anatomical variations, contributing to better management and treatment of the patients.