Radiographic diagnosis of congenital bony nasal stenosis

Congenital bony nasal stenosis (CBNS) is a rare condition that causes respi ratory distress in neonates. Between 1986 and 1996, we encountered 13 cases of CBNS. Recently, CT measurements have been used to evaluate the features of this type of stenosis, but no satisfactory investigation of the severit y of bony nasal stenosis has been reported. We compared the nasal width (NW ), facial width (FW), and interorbital distance (IOD) measured from occipit ofrontal (Caldwell's) projections of plain radiographs in nine CBNS patient s and nine normal infants. NW was significantly narrower in the CBNS patien ts than in the controls, and never exceeded the IOD in any of the CBNS pati ents. This measuring method can be used to diagnose CBNS, because NW in nor mal subjects of all age groups is always greater than IOD on Caldwell's vie w. We also investigated one patient radiographically, to determine how NW i ncreased until the age of 4 years. However, there was no significant change in nasal width, although the FW increased significantly. This method seems useful for determining the severity of stenosis, and its simplicity makes it useful for routine investigation of breathing difficulty in neonates and infants. We review and discuss the CT images of CBNS reported in the liter ature. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.