Divertículo intramedular aracnoide em vértebra torácica de origem desconhecida: relato de caso

Abstract

Spinal arachnoid diverticulum is a rare condition in dogs, characterized by abnormal dilation of the subarachnoid space, which may result in spinal cord compression. It can have congenital or acquired origins, and its formation is related to alterations in cerebrospinal fluid (CSF) dynamics and meningeal anatomy. This study reports the case of a canine patient treated at the São Francisco de Assis Veterinary Hospital presenting with pelvic limb ataxia and urinary retention. During the clinical evaluation, pain was identified in the lumbar region between the T8 and T10 vertebrae, leading to suspicion of an intramedullary lesion. Based on these findings, magnetic resonance imaging (MRI) was requested. MRI revealed the presence of an intramedullary cyst in the region suspected during the neurological examination. Surgical treatment by pediculectomy was indicated for cyst removal, followed by physiotherapy. The patient showed clinical improvement, with recovery of pelvic limb movement and normal urination. Physiotherapy treatment is ongoing until full recovery of pelvic limb function