• Pasquale De Bonis, Carmelo Lucio Sturiale, Carmelo Anile, Simona Gaudino, Annunziato Mangiola, Matia Martucci, Cesare Colosimo, Luigi Rigante, and Angelo Pompucci.
• Institute of Neurosurgery, Catholic University School of Medicine, L.go A. Gemelli 8, 00168 Rome, Italy.
• Clin Neurol Neurosurg. 2013 Aug 1;115(8):1308-12.

BackgroundDecompressive craniectomy (DC) is a known risk factor for the development of post-traumatic hydrocephalus. The occurrence of subdural hygroma (SH) was also reported in 23-56% of patients after DC and it seemed to precede hydrocephalus in more than 80% of cases. We analyzed the relationship among DC, SH and hydrocephalus.MethodsFrom 2007 to 2011, 64 patients underwent DC after head trauma. Variables we analyzed were: intaventricular hemorrhage, age, GCS, distance of craniectomy from the midline, evacuation of a hemorrhagic contusion (HC) and infection. Logistic regression was used to assess the independent contribution of the predictive factors to the development of hydrocephalus.ResultsNineteen patients (29.7%) developed hydrocephalus. Interhemispheric SH was present in 8/19 patients with hydrocephalus and temporally preceded the occurrence of ventricular enlargement. Moreover, most patients who developed a interhemispheric SH had been undergone DC whose superior margin was close to the midline. Logistic regression analysis showed that craniectomy closer than 25 mm to the midline was the only factor independently associated with the development of hydrocephalus.ConclusionCraniectomy close to the midline can predispose patients to the development of hydrocephalus. SH could be generated with the same mechanism, and these three events could be correlated on a timeline.Copyright © 2012 Elsevier B.V. All rights reserved.

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