The Lewy body dementias are as a group the second most common form of neurodegenerative dementia after AD as of 2021. DLB itself is one of the three most common types of dementia, along with AD and vascular dementia. The diagnostic criteria for DLB before 2017 were highly specific, but not very sensitive, so that more than half of cases were missed historically. Dementia with Lewy bodies was under-recognized as of 2021, and there is little data on its epidemiology. The incidence and prevalence of DLB are not known accurately, but estimates are increasing with better recognition of the condition since 2017. About 0.4% of those over the age 65 are affected with DLB, and between per 1,000 people develop the condition each year. Symptoms usually appear between the ages of 50 and 80, (median 76) and it is not uncommon for it to be diagnosed before the age of 65. DLB is thought to be slightly more common in men than women, but a 2014 review challenged that view, and said that the gender distribution was unclear. An estimated 10 to 15% of diagnosed dementias are Lewy body type, but estimates range as high as 23% for those in clinical studies. A French study found an incidence among persons 65 years and older almost four times higher than a US study per 100,000 person-years), but the US study may have excluded people with only mild or no<unk> , while the French study screened for<unk> . Neither of the studies assessed systematically for RBD, so DLB may have been underdiagnosed in both studies. A door-to-door study in Japan found a prevalence of 0.53% for persons 65 and older, and a Spanish study found similar results.
medical cause of Parkinsonism
medical cause of Dementia
symptom of Pantothenate kinase-associated neurodegeneration
complications of Myotonic dystrophy
symptom of Amyotrophic lateral sclerosis
symptom of Spinocerebellar ataxia type 1
medical cause of Polyneuropathy
medical cause of Dystonia