Abstract Background Methylmalonic Aciduria and Homocystinemia. cobalamin C (cblC) is an inherited disease of vitamin B12 metabolism with a wide spectrum of clinical manifestations. cblC presenting with pulmonary hypertension (PH) as leading sympotom is rare and easily misdiagnosed because of limited awareness. Timely diagnosis is crucial by the relentless progression without appropria... https://themightyhobbyers.shop/product-category/advent-calendar/