Vitamin B12 deficiency: unusual cause of jaundice in an adolescent

Vitamin B₁₂ deficiency in vegans is a known cause of megaloblastic anaemia. We report an adolescent girl who presented with jaundice and weight loss for 6 months secondary to vitamin B₁₂ deficiency, leading to megaloblastic anaemia. Replacement with vitamin B₁₂ reversed her symptoms, resulting in weight gain, and normalised her haemoglobin, red blood cell morphology, bilirubin levels and serum vitamin B₁₂ levels.

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