Hemimegalencephaly with polymicrogyria - a case report

Area of Science:

• Neurology
• Neuroimaging
• Developmental Neuroscience

Background:

• Hemimegalencephaly is a congenital brain malformation characterized by abnormal cortical development.
• Magnetic resonance imaging (MRI) is crucial for diagnosing and characterizing hemimegalencephaly.
• Associated features include cortical thickening, abnormal gyration, and grey-white matter blurring.

Observation:

• A ten-year-old boy with a history of infantile spasms and developmental delay presented with disinhibited behavior.
• Clinical presentation prompted a pediatric neurology consultation and neuroimaging.
• The patient exhibited behavioral changes within a family environment.

Findings:

• MRI revealed isolated hemimegalencephaly, a condition affecting one cerebral hemisphere.
• Polymicrogyria, characterized by excessive small gyri, was specifically noted in the right occipital lobe.
• The imaging findings confirmed a focal brain malformation.

Implications:

• This case underscores the importance of neuroimaging in diagnosing rare brain malformations like hemimegalencephaly.
• Understanding the specific patterns of malformation, such as isolated hemimegalencephaly with polymicrogyria, aids in prognosis.
• Further research into the neurobiological underpinnings of such conditions is warranted for improved therapeutic strategies.