Microcephaly in Australian infants: A retrospective audit

Area of Science:

• Pediatrics
• Genetics
• Neurology

Background:

• Microcephaly, defined as an occipitofrontal circumference (OFC) more than two standard deviations below the mean, presents significant diagnostic challenges in infants.
• Understanding the clinical characteristics, outcomes, and causes of microcephaly identified within the first year of life is critical for early intervention and management.

Purpose of the Study:

• To describe the clinical characteristics, outcomes, and causes of microcephaly in children identified within the first year of life.
• To investigate the association between microcephaly severity, timing of diagnosis, and developmental outcomes or structural brain anomalies.

Main Methods:

• Retrospective review of medical records of 197 microcephalic children born between 2008 and 2018.
• Microcephaly defined as OFC >-2 SD; severe microcephaly as OFC >-3 SD.
• Analysis of congenital anomalies, neurological signs, central nervous system (CNS) imaging, developmental milestones, and diagnosed genetic disorders.

Main Results:

• Of 197 microcephalic children, 98% had congenital anomalies (93% major), and 75% had neurological signs (most commonly seizures).
• Abnormal CNS imaging was found in 89% of those with imaging, revealing structural brain abnormalities.
• Developmental milestone delays (69%), visual impairment (41%), and cerebral palsy (13%) were common; 51% of cases were idiopathic, and 24% had diagnosed genetic disorders.

Conclusions:

• Microcephaly is frequently associated with congenital anomalies and neurological complications.
• A systematic diagnostic workup, including genetic testing and neuroimaging, is essential for identifying the cause of microcephaly.
• Early diagnosis and comprehensive investigation aid in predicting prognosis and guiding genetic counseling and therapy.