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We provide Support, Education and Research for patients living with Chiari Malformation, Syringomyelia and associated conditions.
F39 Persistent fontanelles in Chihuahuas.
Kiviranta A, Rusbridge C, Lappalainen AK, Vapaavuori O, Jokinen TS.
Anecdotally, a persistent fontanelle is common in adult Chihuahuas but the prevalence is unknown. Known as a molera, or “soft spot”, it is considered a mark of “purity” by some breeders. The aim of this study was to describe the presence and distribution of persistent fontanelles in Finnish Chihuahuas, as part of a broader study investigating Chihuahuas with Chiari-like malformation and syringomyelia.
Data was collected from both symptomatic dogs and those without clinical signs. The cranium of the dogs was imaged with computed tomography. Dorsal, lateral and caudal cranial sutures were assessed for the presence of persistent fontanelles.
Results. Fifty dogs were included into the study. Forty-six (9 out of 10) had a persistent fontanelle. Thirty-three (2 out of 3) had between 1 and 3 persistent fontanelles but with a range in the whole group of 1 to 13. Most of the persistent fontanelles were located dorsally (58/250, or 1 in 4), and most commonly at the fronto-parietal suture (40/50 dogs, or 4 out of 5).
No previous reports describing persistent fontanelles in dogs exist and the clinical significance of these is currently unknown. In children, persistent fontanelles are associated with increased intracranial pressure. Our future aim is to evaluate possible association of persistent fontanelles with the presence of syringomyelia, ventriculomegaly and mastoid foramen areas, as well as with Chiari-like malformation and syringomyelia-related clinical signs.