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Encephaloscopes with a nonflexible (i.e., rigid) structure that can follow only a straight path into the cranium; they consist of thin (e.g., 4 mm diameter) endoscopes that are available with different directions of view (e.g., 30 or 120 degrees) enabling direct examination of the cerebral ventricles (i.e., ventriculoscopy) and inspection of cystic tumors.
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