Hemorrhage into the posterior fossa is a rare neurosurgical emergency in neonates. CT scanning is diagnostic. Blood layering under the apex of the tentorium cerebelli, however, may resemble a dilated vascular structure, and the rigidity of the pressured tentorium may prevent upward transmission of increased intracranial pressure, resulting in a soft fontanelle.
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Coker et al. (1987) studied this question.
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