PCSK9 and choanal atresia: Another interstitial deletion at 1p32.1p32.3, 6.4 Mb in size, was reported by Kehrer et al[21] who described a 17-month-old boy with features of low LDL cholesterol, choanal atresia, delayed speech and language development, hearing loss, urogenital anomalies, and craniofacial dysmorphism (microcephaly, flat nasal bridge, small nose, anteverted nares, retrognathia), also effected the PCSK9 and DAB1 genes, with few similar clinical features with our case.