Background Porencephaly is an extremely rare neurological disease characterized by the presence of solitary or multiple degenerative cerebrospinal fluid (CSF) cavities within the brain parenchyma. Case Report We describe a case involving a 23-year-old male who presented with involuntary movements of the left upper limb of 6 months' duration. A diagnosis of porencephaly was confirmed by magnetic resonance imaging (MRI). Conclusion The rarity of occurrence and atypical presentation of such a lesion present a challenge to clinicians. Little is known about the pathogenesis and appropriate management of porencephaly. Further studies of the implications of porencephaly for neurodevelopment and behavior are needed.
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