Three-dimensional cranial geometric morphometrics of syringomyelia in toy breed dogs.

3D geometric morphometrics identifies breed-specific cranial abnormalities associated with syringomyelia in toy breeds.

This study employed three-dimensional geometric morphometrics (GM) to analyze cranial anatomy in toy breed dogs with and without syringomyelia (SM). Using CT scans from Chihuahuas, Toy Poodles, Pomeranians, and Cavalier King Charles Spaniels, researchers applied Procrustes analysis and multivariate statistical analyses to identify breed-specific cranial abnormalities. Results demonstrated that SM-affected dogs showed statistically significant cranial shape differences in three breeds (p < 0.001), with particularly clear distinction in Chihuahuas, Toy Poodles, and Pomeranians. The study revealed consistent foramen magnum abnormalities across all breeds, including novel 3D deformities such as rostral displacement of lateral margins. Additionally, rostral cranial structure displacement (frontal sinus and cribriform plate) was detected in Toy Poodles and Pomeranians but absent in Chihuahuas and CKCS. These findings suggest breed-specific pathogenic mechanisms for SM development. The application of 3D GM proved superior to previous linear morphometric approaches, enabling detection of subtle cranial abnormalities that may be relevant to SM pathogenesis and potentially useful for breed-specific screening strategies.

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