[Half-nose; a very rare congenital anomaly].

Aplasia of the nose is a very rare, congenital anomaly in our field. It emerges as a complete absence of the external nose and all nasal cavities on both sides, or an absence of one half of the nose and its associated nasal cavity. The latter case is called "halfnose." Etiologically, it is akin to tubular proboscis, anomaly with a snout-like nasal appendage on, or by the mid-line of the face. Tubular proboscis is caused by a failure of the embryonal frontonasal process to migrate downward, and aplasia occurs when the frontonasal