The authors report a case in which a hematoma of the quadrigeminal plate resulted from the rupture of a "cryptic" arteriovascular malformation (AVM) fed by the artery of the quadrigeminal plate. The AVM was symptomatic before rupturing and this clinical feature, associated with the lack of angiographic demonstration, led to the erroneous preoperative diagnosis of a tumor. In retrospect, the only finding that might have suggested the correct diagnosis was the beaded appearance on the ventriculogram of the aqueduct due to blood clots into this fluid space.
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| http://dx.doi.org/10.3171/jns.1978.49.4.0610 | DOI Listing |
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BACKGROUND The precedence effect (PE) is a physiological phenomenon for accurate sound localization in a reverberant environment. Physiological studies of PE have mostly focused on the central nucleus of the inferior colliculus (CNIC), which receives ascending and descending projections, as well as projections from the shell of the inferior colliculus (IC) and contralateral IC. However, the role of the dorsal cortex of the IC (DCIC), which receives ascending and descending projections to ensure sound information processing and conduction on PE formation, remains unclear.
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