A Rare Case of Severe Vitamin B12 Deficiency Presenting as Pancytopenia and Neuropsychiatric Manifestations in a Young Adult: A Case Report. VIMSHSJ [Internet]. 2026 Mar. 30 [cited 2026 Aug. 4];13(1). Available from: https://www.vimshsj.edu.in/index.php/main/article/view/457