Primary microcephaly in Hungary: epidemiology and clinical features

Area of Science:

• Neurology
• Genetics
• Epidemiology

Background:

• Primary microcephaly is a rare congenital brain malformation.
• Understanding its epidemiological characteristics is crucial for genetic counseling.
• Previous prevalence data is limited.

Purpose of the Study:

• To determine the population-based epidemiological characteristics of primary microcephaly in Hungary.
• To describe the clinical features of affected individuals.
• To establish the birth prevalence of this rare condition.

Main Methods:

• Retrospective survey of microcephaly cases in a Hungarian region (July 1992 - June 2006).
• Inclusion criteria: microcephaly without environmental/obstetric risk factors or dysmorphism.
• Calculation of birth prevalence per 10,000 live births.

Main Results:

• Ten cases of primary microcephaly identified among 185,486 live births.
• Birth prevalence: 0.54 per 10,000 live births (95% CI: 0.20-0.87).
• Key clinical features included developmental delay, intellectual disability, and simplified gyral patterns on MRI.

Conclusions:

• Primary microcephaly is exceptionally rare, with a slightly higher prevalence noted in this study.
• Accurate ascertainment of rare cases is vital as genetic causes are increasingly identified.
• This data aids in providing genetic counseling for affected families.