Vitamin B12 deficiency in a pediatric patient with gastric obstruction and jejunal feeding dependence: A case report.

Pediatric B12 deficiency is most caused by insufficient dietary intake, malabsorption or autoimmune gastritis. 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-dose 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.