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General
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Radiologic images
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Tumor at midline of posterior brain

Partially calcified pineal mass

Homogeneous enhanced pineal tumor

Case reports
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Treatment
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Gross description
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Micro description
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Micro images
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Typical pineoblastoma with a fibrillar background

Histologic aspects

Highly cellular tumor

Homer-Wright rosettes


Dense small nuclei and scant cytoplasm

Fibrillary, neuropil-like background

Numerous atypical mitoses


Neurofilament

GFAP

Synaptophysin

Ki-67 labelling index - 30%

Cytology images
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Small blue cell neuroepithelial malignant tumor

Positive stains
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Negative stains
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Electron microscopy description
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Electron microscopy images
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Presence of abundant filopodia and rare intercellular junctions but no definitive synapses

Differential diagnosis
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End of CNS tumor > Pineal tumors > Pineoblastoma



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