Surgical video of septum cavum colloid cyst

Cavum septum pellucidum (CSP) cysts are rare midline intracranial cysts, typically asymptomatic but capable of causing neurological symptoms when enlarged. With an incidence of approximately 0.04%, symptomatic cases are even rarer and may present with headaches, ataxia, seizures, visual disturbances, or cerebrospinal fluid (CSF) obstruction leading to hydrocephalus. These cysts are characterized by lateral bowing of the septal walls and a width of at least 10 mm. We present an operative video of a 41-year-old gentleman who presented with imbalance while walking, lower limb weakness, and memory impairment. His radiological evaluation was suggestive of a CSP cyst extending into the third ventricle with gross ventriculomegaly. Surgical excision of the cyst was performed via a transcallosal approach, leading to significant improvement in symptom complexity. This manuscript highlights the importance of considering CSP cysts in unexplained neurological conditions and the potential benefits of timely surgical intervention.