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✓ The authors present the cases of two young adults with low-grade astrocytomas limited to the aqueductal region of the tectum of the mesencephalon. The characteristic presentation of hydrocephalus without brain-stem signs is described. Careful radiological examination, including computerized axial tomography, failed to reveal any evidence of tumor. The diagnosis was established at postmortem examination. Literature review yielded 12 previous cases of similar presentation.

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