EN
Syringomyelia (SM) is a rare disorder characterized by the development of fluid filled cavities (syrinxes) in the spinal cord parenchyma which occurs secondarily to an obstruction of cerebrospinal fluid (CSF) outflow at the foramen magnum level. The precise pathophysiology of SM is still not fully understood. The most common predisposing cause in dogs is a Chiari-like malformation (CM). This disease is defined as a developmental failure of the occipital bone leading to overcrowding of the caudal cranial fossa. Abnormally small bony structures contain rhomencephalon structures (cerebellum and medulla oblongata) which are unchanged in size. This “mismatch” causes caudal displacement of encephalon structures via the foramen magnum, altering the cerebrospinal fluid flow. CM is thought to be associated with a higher grade of brachycephaly. The SM/ CM complex is very common in Cavalier King Charles Spaniel (CKCS) breed.