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Despite an increased concordance rate in monozygotic twins, mirror-image cleft formations represent a very rare phenotype, for which only very few case reports exist in the literature. The present case report describes a female pair of monozygotic twins from Germany who were born with mirror-image bilateral complete and incomplete cleft lip and alveolus.<\/jats:p>","DOI":"10.1177\/10556656261455736","type":"journal-article","created":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T13:25:43Z","timestamp":1781529943000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Mirror-image Bilateral Complete and Incomplete Cleft Lip and Alveolus in Monozygotic Twins: A Case Report"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-7641-3938","authenticated-orcid":false,"given":"Sebastian","family":"K\u00f6ppert","sequence":"first","affiliation":[{"name":"Asklepios Klinik Nord \u2013 Heidberg"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"Metz","sequence":"additional","affiliation":[{"name":"Asklepios Klinik Nord \u2013 Heidberg"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henning","family":"Hanken","sequence":"additional","affiliation":[{"name":"Asklepios Klinik Nord \u2013 Heidberg"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,6,15]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1159\/000337464"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/ajmg.a.32854"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-024-79346-7"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1177\/10556656211013687"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.4103\/jispcd.JISPCD_399_20"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.1097\/SCS.0000000000004214"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev-nutr-043020-091647"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.annepidem.2025.09.004"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.3390\/genes14101859"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1038\/ng.2360"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1597\/15-327"},{"key":"e_1_3_3_13_2","doi-asserted-by":"publisher","DOI":"10.1111\/odi.14174"},{"key":"e_1_3_3_14_2","doi-asserted-by":"publisher","DOI":"10.1002\/aja.1001200112"},{"key":"e_1_3_3_15_2","unstructured":"DGMKG D. 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