RT Journal Article SR Electronic T1 Nasal polyps masking a unilateral choanal atresia JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 415 OP 416 VO 24 IS 4 A1 Al-Kindy, Sami A. YR 2003 UL http://smj.org.sa/content/24/4/415.abstract AB