Cervical Intradural/Extramedullary Intervertebral Disc Extrusion in a Dog

ABSTRACT A 6‐year‐old male neutered Jack Russell Terrier presented via the emergency department for subacute progressive asymmetrical tetraparesis and cervical hyperesthesia. MRI showed T2‐weighted (T2W) and T1‐weighted (T1W) hypointense material, positioned dorsocaudally to the C3–4 intervertebral disc on the right ventrolateral aspect of the spinal cord, causing moderate‐to‐severe compression of the spinal cord. The material was sharply marginated with a pointed/sharp beak‐like appearance (beak sign). On parasagittal images, two hyperintense lines appearing as a “Y” were appreciated (Y‐sign). Surgical findings confirmed an intradural/extramedullary intervertebral disc extrusion (IVDE). This is the first report of a cervical intradural/extramedullary IVDE in a dog.