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We present a unique case of B12 deficiency in a pediatric patient with complex gastrointestinal anatomy and jejunal nutritional dependence nearly two decades after unsuccessful surgical intervention. High\u2010dose enteral B12 supplementation via jejunostomy tube resulted in rapid resolution of the patient's neuromuscular manifestations of vitamin B12 deficiency, highlighting the importance of considering nutritional deficiencies in patients reliant on jejunal enteral nutrition and anatomic differences.<\/jats:p>","DOI":"10.1002\/jpr3.70117","type":"journal-article","created":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T10:57:38Z","timestamp":1765277858000},"page":"174-178","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Vitamin B12 deficiency in a pediatric patient with gastric obstruction and jejunal feeding dependence: A case report"],"prefix":"10.1002","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-0897-8738","authenticated-orcid":false,"given":"Angela H.","family":"Nguyen","sequence":"first","affiliation":[{"name":"Department of Pediatrics Stanford Children's Health Stanford California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dorsey","family":"Bass","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Division of Pediatric Gastroenterology, Hepatology, and Nutrition Stanford Children's Health Stanford California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rachel E.","family":"Herdes","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Division of Pediatric Gastroenterology, Hepatology, and Nutrition Stanford Children's Health Stanford California USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,12,9]]},"reference":[{"key":"e_1_2_7_2_1","unstructured":"National Institutes of Health Office of Dietary Supplements.Vitamin B12 \u2010 Health Professional Fact Sheet;2025.https:\/\/ods.od.nih.gov\/factsheets\/VitaminB12-HealthProfessional\/"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1093\/jn\/nxy201"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1067\/mpd.2001.112160"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1097\/00000658-199307000-00014"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj-2022-071725"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.gastro.2020.06.090"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.2527\/jas.2016-0713"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1053\/j.gastro.2020.06.046"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1152\/ajpgi.00224.2009"}],"container-title":["JPGN Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/jpr3.70117","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/jpr3.70117","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/jpr3.70117","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,2,12]],"date-time":"2026-02-12T04:58:46Z","timestamp":1770872326000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/jpr3.70117"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,12,9]]},"references-count":9,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2026,2]]}},"alternative-id":["10.1002\/jpr3.70117"],"URL":"https:\/\/doi.org\/10.1002\/jpr3.70117","archive":["Portico"],"relation":{},"ISSN":["2691-171X","2691-171X"],"issn-type":[{"value":"2691-171X","type":"print"},{"value":"2691-171X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,12,9]]},"assertion":[{"value":"2025-04-01","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-10-31","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-12-09","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}