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Abstract
Medulloblastomas have been characterized as solid, homogeneously enhancing, midline
masses of the posterior fossa. To evaluate atypical MRIcharacteristics, we retrospectively
reviewed 13 histologically proven medulloblastomas. MRI examinations were correlated
with pathologic specimens and operative reports. Atypical features included cyst formation
(77%), irregular enhancement (19%), extension through fourth ventricle foramina (15%),
and presentation as a cerebellopontine angle mass (8%). We conclude that “atypical”
characteristics are common. In the child or young adult, medulloblastomas must be
included in the differential diagnosis of any posterior fissa mass.
Keywords
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Article info
Publication history
Accepted:
May 6,
1992
Received:
March 2,
1992
Identification
Copyright
© 1992 Published by Elsevier Inc.
