Computed tomographic features of choanal atresia in a Friesian foal.

Abstract A 3-week-old Friesian colt with a history of respiratory distresssince birth was presented to our facility. Results after an endoscopy showed obstruction of the right nasal passageto the nasopharynx. Computed tomography was performed to further characterize this unilateralblockage. The images demonstrated a complete membranous obstruction of the ventral meatus, along with deviation of the vomer bonetoward the left side of the nasal cavity. The diagnosis of unilateral choanal atresiawas confirmed. This report is the first to describe computed tomographic features of choanal atresiain a foal.