{"id":15773,"date":"2025-03-26T16:19:59","date_gmt":"2025-03-26T16:19:59","guid":{"rendered":"https:\/\/hallmarq.net\/2025\/03\/26\/how-mri-can-help-diagnose-chiari-like-malformation-in-dogs\/"},"modified":"2025-03-26T16:28:43","modified_gmt":"2025-03-26T16:28:43","slug":"how-mri-can-help-diagnose-chiari-like-malformation-in-dogs","status":"publish","type":"post","link":"https:\/\/hallmarq.net\/us\/2025\/03\/26\/how-mri-can-help-diagnose-chiari-like-malformation-in-dogs\/","title":{"rendered":"How MRI Can Help Diagnose Chiari-Like Malformation in Dogs"},"content":{"rendered":"\n

Chiari-like malformation is a developmental condition that particularly affects small and brachycephalic breeds such as Cavalier King Charles Spaniels, Chihuahuas, and Pugs. Hallmarq’s Small Animal Medical Director and Advisory Board Chair, Dr. Simon Platt, explores how MRI can help diagnose Chiari-like malformation in dogs, assessing its severity, and providing insights into the prognosis.<\/p>\n\n\n\n

Symptoms of Chiari-Like Malformation in Dogs<\/h2>\n\n\n\n

Chiari-like malformation occurs when the skull is too \u2018small\u2019 to accommodate the brain. This causes the cerebellum to be indented or impacted into, or herniate through, the foramen magnum, the opening at the base of the skull. This can lead to a range of signs, which include sporadic pain phenomena, neck sensitivity, and even neurological deficits. <\/p>\n\n\n\n

The pain can be position-based causing a refusal, hesitation, difficulty, or vocalization when going up the stairs and yelping when greeting the owner. It can often be accompanied by; an unusual head posture when sleeping and when awake. The dogs can also exhibit head pain, manifested as scratching or rubbing the head or ears and sometimes yelping whilst scratching these areas. In addition, they can have an aversion to touch or grooming of the head and ears but tolerate touch or grooming elsewhere. There can be altered sleep patterns in some affected dogs, with altered activity levels and becoming more timid, anxious, or withdrawn in general.<\/p>\n\n\n\n

Magnetic Resonance Imaging (MRI)<\/a> has become an invaluable tool in diagnosing Chiari-like malformation in dogs, assessing its severity, and providing insights into the prognosis.<\/p>\n\n\n\n

Diagnosing Chiari-Like Malformation (CM) With MRI<\/strong><\/h2>\n\n\n\n

MRI is the gold standard for diagnosing Chiari-like malformation in dogs, which helps rule out other conditions that could cause similar clinical signs. Unlike X-rays or CT scans, MRI provides detailed, high-resolution images of the brain and spinal cord. MRI allows veterinarians to visualize the structural abnormalities associated with CM.<\/p>\n\n\n\n

Ideally, predisposed breeds would have MRI screening from 12 months of age (before breeding) and after 5 years old (after breeding).<\/p>\n\n\n\n

Key diagnostic features of Chiari-like malformation on MRI include (Figure 1):<\/p>\n\n\n

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Figure 1. <\/strong>Key diagnostic features of Chiari malformation on MRI. A sagittal T2W brain MRI \u2013 note the herniated vermis of the cerebellum through the foramen magnum (yellow arrow), the prominent lateral ventricles (blue arrow), the rounded frontal aspect of the forebrain (green arrow), and the angle rather than slope between the nasal and frontal bones (red lines) along with the absence of frontal sinuses.<\/figcaption><\/figure>\n<\/div>\n\n\n