Patients with severe hydrocephalus and reduced cortical mass maintain normal cognitive function
Evidence consistently shows that severe hydrocephalus and reduced cortical mass are associated with measurable motor and cognitive deficits rather than normal cognitive function. Clinical and experimental studies demonstrate that ventricular enlargement leads to impairments that often improve following surgical intervention.
The claim states that patients with severe hydrocephalus and reduced cortical mass maintain normal cognitive function. The retrieved literature directly refutes this, demonstrating that hydrocephalus and ventriculomegaly lead to learning, motor, and cognitive deficits (such as in iNPH or experimental models), which often improve after surgical shunting or CSF drainage. None of the papers support the assertion that patients maintain normal cognitive function in the presence of severe hydrocephalus and reduced cortical mass; instead, they document widespread cognitive impairment.
Olopade FE, Shokunbi MT, Sirén AL. The relationship between ventricular dilatation, neuropathological and neurobehavioural changes in hydrocephalic rats.. 2012. https://doi.org/10.1186/2045-8118-9-19
This study in rats demonstrates that hydrocephalus and reduced cortical thickness lead to significant learning and motor deficits that correlate with the degree of ventriculomegaly.
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ROBERT C. RUBIN, GERALD HOCHWALD, MELVIN TIELL, BOLEK LIWNICZ, FRED EPSTEIN. Reconstitution of the Cerebral Cortical Mantle in Shunt‐corrected Hydrocephalus. 1975. https://doi.org/10.1111/j.1469-8749.1975.tb03595.x
This study indicates that severe hydrocephalus disrupts structural and functional integrity of the brain, necessitating prompt intervention to preserve function.
Samanta Fabrício Blattes da Rocha, P. Kowacs, Ricardo Krause Martinez de Souza, M. K. Pedro, R. Ramina, H. Teive. Serial Tap Test of patients with idiopathic normal pressure hydrocephalus: impact on cognitive function and its meaning. 2021. https://doi.org/10.1186/s12987-021-00254-3
This study shows that patients with normal pressure hydrocephalus exhibit baseline cognitive decline which improves following cerebrospinal fluid drainage.
Chihiro Kamohara, Madoka Nakajima, Yuji Nozaki, Taiki Ieda, Kaito Kawamura, Kou Horikoshi, Ryo Miyahara, C. Akiba, I. Ogino, K. Karagiozov, Masakazu Miyajima, Akihide Kondo, Maki Sakamoto. A new test for evaluation of marginal cognitive function deficits in idiopathic normal pressure hydrocephalus through expressing texture recognition by sound symbolic words. 2024. https://doi.org/10.3389/fnagi.2024.1456242
This study documents that patients with normal pressure hydrocephalus experience mild cognitive disorders and deficits linked to ventricular pathology.
Masatsune Ishikawa, E. Mori, H. Kazui. Gait and frontal lobe function become associated in patients with idiopathic normal pressure hydrocephalus after shunt surgery. 2025. https://doi.org/10.3389/fneur.2025.1647707
This study evaluates cognitive and frontal lobe function in hydrocephalus patients, confirming measurable cognitive impairment associated with the condition.
James P. Caruso, T. E. El Ahmadieh, Tiffany Trent, Sonja E. Stutzman, Rachel L Anderson, Nathan J. Schneider, C.M. Woodruff, Ammar Adenwalla, Jason Wang, A. Almekkawi, Aardhra M Venkatachalam, DaiWai M. Olson, S. Aoun, Jonathan A. White. Neurologic Quality of Life Outcomes in Patients with Normal Pressure Hydrocephalus After Ventriculoperitoneal Shunt Placement: A Prospective Assessment of Cognition, Mobility, and Social Participation.. 2024. https://doi.org/10.1016/j.wneu.2024.06.068
This study highlights that normal pressure hydrocephalus presents with cognitive decline that significantly improves after shunt placement, refuting the idea of normal baseline function.
Healy LM, Tooze J, Quist D, Varma P, Carswell C, Fernández-Méndez R, Pickard JD, Smielewski P, Joannides AJ. Cognitive assessment methods and outcomes following shunt surgery in idiopathic normal pressure hydrocephalus (iNPH): a systematic review and meta-analysis.. 2026. https://doi.org/10.1186/s12987-026-00808-3
This meta-analysis establishes that patients with normal pressure hydrocephalus suffer from core cognitive deficits that show measurable impairment prior to treatment.
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