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Observations of an angioscope inserted into the cisterna magna Panel (a) depicts the use of the angioscope to observe the floor of the fourth ventricle of the central sulcus (arrow), as well as the cerebral aqueduct (arrow head). Panel (b) indicates the use of the angioscope inserted through the foramen magnum to observe the anterior surface of the spinal cord (double arrow), which could be evaluated up to the C3 vertebrae.
