Si Segnalano due casi di idrocefalo tetraventricolare comunicante in cui la estensione delle indagini al rachide ha consentito di evidenziare due processi espansivi intramidollari oligosintomatici. Vengono riassunte le principali teorie fisiopatologiche finora formulate per interpretare la genesi dell'idrocefalo e suggerire alcune riflessioni di ordine diagnostico-terapeutico.
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