Intraventricular neurocytoma presenting as Kleine-Levin syndrome: resolution after resection and review of neurosurgical conditions associated with hypersexuality. Illustrative case

Compression by an intraventricular mass on the septal area, diencephalon, and hypothalamus may induce secondary KLS (sKLS). Tumor removal can relieve the syndrome. Hypersexualty and sKLS were reported more frequently with neurosurgical diseases of the right hemisphere, but the number of cases reported is insufficient to reach a conclusion and further observations are needed. https://thejns.org/doi/10.3171/CASE25800.