[Early onset dementias: three cases].

Introduction: Dementia is a decline of intellectual abilities. The etiology of dementia syndrome is diverse. The authors describe three patients with early-onset dementia.

Case Reports: The first patient was a 44 years old male with mild gait, body ataxia, memory loss, slowness and apathy Investigations proved AIDS dementia syndrome. In the second case of a 37 years old female patient, herpes simplex encephalitis was suspected due to sudden onset of speech arrest and to brain MRI and CSF findings. Her symptoms improved during antiviral treatment but later progressive dementia developed. CSF serological tests proved the presence of neurolues-dementia paralytica. The third patient was a 38-years-old female. Neurological examination was performed because of progressive memory loss, changed behaviour and impaired attention. Neuropsychological test showed severe dementia. Metachromatic leukodystrophy was proven by decreased arylsulfatase activity.

Conclusions: It is not easy to recognize the early symptoms of dementia. In these cases, besides detailed history, neurological examination and neuropsychological tests, brain MRI and cerebral spinal fluid serological tests were indispensable for a correct diagnosis, especially in the young patients.