{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T23:22:37Z","timestamp":1788304957473,"version":"build-2803163510"},"reference-count":29,"publisher":"Wiley","issue":"18","license":[{"start":{"date-parts":[[2008,8,12]],"date-time":"2008-08-12T00:00:00Z","timestamp":1218499200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American J of Med Genetics Pt A"],"published-print":{"date-parts":[[2008,9,15]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Thyrotoxicosis affects 0.2% of pregnant women and antithyroid drugs are the treatment of choice during pregnancy. Several case reports have suggested a relationship between the prenatal use of methimazole (MMI) and choanal atresia in the offspring. However, two epidemiological studies did not find an increased teratogenic risk for MMI. This multicenter case\u2013control study compared the frequency of maternal hyperthyroidism treated with MMI during pregnancy, in children with choanal atresia (cases) and a control group randomly selected (three matched controls according to maternal age for each case). Mothers of cases (N\u2009=\u200961) and controls (N\u2009=\u2009183) were interviewed for socio\u2010demographic questions, obstetrical and genetic history, and exposure during pregnancy to different agents; specifically detailed information regarding hyperthyroidism and MMI intake was obtained. Prenatal exposure to maternal hyperthyroidism treated with MMI was identified in 10\/61 cases (16.4%) compared to 2\/183 (1.1%) in the control group (OR\u2009=\u200917.75; CI95%\u2009=\u20093.49\u2013121.40). Cases and controls did not differ in their parental degree of education, paternal occupation, twinning, maternal parity, and other exposures during pregnancy. Facial features in exposed cases showed some similarities. Our data suggest that prenatal exposure to maternal hyperthyroidism treated with MMI is associated with choanal atresia. In addition, based on our cases and a critical literature review, we propose that the mother's disease might be the causal factor and not the MMI treatment. \u00a9 2008 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.a.32497","type":"journal-article","created":{"date-parts":[[2008,8,12]],"date-time":"2008-08-12T18:27:21Z","timestamp":1218565641000},"page":"2390-2395","source":"Crossref","is-referenced-by-count":103,"title":["Choanal atresia associated with maternal hyperthyroidism treated with methimazole: A case\u2013control 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