title: Optic neuropathy caused by vitamin-B12 deficiency in carriers of the fish tapeworm, Diphyllobothrium latum.
mesh_terms: D000293:Adolescent; D000328:Adult; D000748:Anemia, Macrocytic; D002590:Cestode Infections / Q000150:complications*; D005128:Eye Diseases / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D009900:Optic Nerve; D012607:Scotoma; D014806:Vitamin B 12 Deficiency / Q000150:complications*