PMC4900200_01
22-year-old female with rosette-forming glioneuronal tumor. Images reveal a hypodense mass lesion involving the midline posterior fossa, with predominant involvement of the fourth ventricle. Calcifications are seen within the lesion. A: Sagittal, noncontrast CT image. B: Axial, noncontrast CT image.
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22-year-old female with rosette-forming glioneuronal tumor. T2-weighted MRI shows a heterogeneous, hyperintense lesion in the midline posterior fossa, with involvement of the fourth ventricle. A: Axial view. B: Coronal view.
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T2 hyperintense lesion, with multiple cystic areas, involving the fourth ventricle, which was expanded (Figs. 2A, B). The lesion was closely related to the midline vermis; no definite plane between the lesion and the vermis was seen.
22-year-old female with rosette-forming glioneuronal tumor. Noncontrast, T1-weighted image shows a heterogeneous, hypointense lesion involving the midline posterior fossa, with predominant involvement of the fourth ventricle. A: Axial view. B: Sagittal view.
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On the T1-weighted sequence, the lesion was predominantly hypointense and mildly heterogeneous (Figs. 3A, B).
22-year-old female with rosette-forming glioneuronal tumor. Postcontrast T1-weighted image shows patchy areas of enhancement involving the midline posterior fossa lesion, with involvement of the fourth ventricle. A: Axial view. B: Sagittal view.
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Linear and serpiginous areas of enhancement were seen within the lesion (Figs. 4A, B).