Pyriform Aperture Stenosis

inline_192_pyriform_aperture_stenosis_mediumPyriform aperture stenosis (PAS) is a very rare congenital anomaly where the anterior opening of the nose is narrow secondary to overgrowth of the maxillary bone. PAS is sometimes associated with other abnormalities, including the presence of a single central incisor tooth and pituitary abnormalities.
What are the causes of pyriform aperture stenosis?
Pyriform aperture stenosis is present at birth and can be associated with other abnormalities. There is no known specific cause.

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