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We specifically studied NIHF cases that occurred without any other anomalies in the prenatal diagnostic workup, defined as isolated NIHF (iNIHF).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>To identify iNIHF we retrospectively classified prenatal findings of 700 NIHF singletons, diagnosed in our prenatal referral center between 1997 and 2016. We studied the occurrence of prenatal resolution in iNIHF and linked it to the perinatal outcome. We obtained long-term outcome by contacting the parents, children, and the pediatricians and listed all functional and structural anomalies and temporary logopedic, psychosocial and motoric impairments.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Among 70 iNIHF cases, 54 (77.1%) resolved completely prenatally. The baby-take-home rate was 98.1% in these cases. In contrast, the baby-take-home rate in the subgroup without complete resolution was 25.0%.<\/jats:p>\n                <jats:p>We achieved pediatric long-term outcome in 27 of 57 survivors (47.4%) of iNIHF with a mean follow-up period of 10.9\u00a0years. Among these 27 children, fetal hydrops had completely resolved prenatally in 26 cases and had regressed to a mild effusion in one case. In the pediatric development, two children had significant functional impairment and two children showed recurrent skin edema.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>Complete spontaneous resolution was the most common intrauterine course of iNIHF in our collective. Completely resolved iNIHF had a favorable perinatal outcome in our study. Our data on the long-term outcomes are consistent with the assumption of an increased rate of functional impairments.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Trial registry<\/jats:title>\n                <jats:p>Internal study number of Heinrich-Heine-University, Duesseldorf: 6177R. Date of registration: December 2017.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00404-022-06731-w","type":"journal-article","created":{"date-parts":[[2022,8,22]],"date-time":"2022-08-22T13:06:12Z","timestamp":1661173572000},"page":"487-497","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Isolated non-immune hydrops fetalis: an observational study on complete spontaneous resolution, perinatal outcome, and long-term follow-up"],"prefix":"10.1007","volume":"308","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2360-685X","authenticated-orcid":false,"given":"Sophie","family":"Neveling","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0235-2777","authenticated-orcid":false,"given":"Alexander Johannes","family":"Knippel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Kozlowski","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2022,8,22]]},"reference":[{"issue":"2","key":"6731_CR1","doi-asserted-by":"publisher","first-page":"127","DOI":"10.1016\/j.ajog.2014.12.018","volume":"212","author":"ME Norton","year":"2015","unstructured":"Society for Maternal-Fetal M, Norton ME, Chauhan SP, Dashe JS (2015) Society for maternal-fetal medicine (SMFM) clinical guideline #7: nonimmune hydrops fetalis. 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