Recurrent multiloculated cystic variant of Lhermitte-Duclos disease managed with cyst fenestration and Ommaya reservoir placement: illustrative case.

Although LDD generally follows a benign course, multiloculated cystic variants can present with progressive recurrence and neurological deterioration. This case emphasizes the importance of recognizing cystic changes in LDD and demonstrates that adequate fenestration with communication to cisternal spaces, supplemented by Ommaya reservoir placement when necessary, can provide durable disease control. https://thejns.org/doi/10.3171/CASE25907.