Answer
Answer 16-15. Most common treatable causes include depression ("pseudodementia"), thyroid dysfunction, metabolic encephalopathy secondary to medications, hypoxia, nutritional deprivation, or dehydration (electrolyte and fluid imbalances). Rarely, it may be caused by: B12, thiamine or folic acid deficiency, anemia, subdural hematoma (usually bilateral), tumor, hyperlipidemia, chronic meningitis (cryptococcal, syphilitic), demyelinating disease, normal pressure hydrocephaly.