Atypical teratoid rhabdoid tumour (AT/RT)
Infant with a mass on CT (not shown) for further evaluation.
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Left lateral intraventricular mass lesion.
The patient went on to have a craniotomy and debulking of the tumour.
Frozen section diagnosis: Left lateral ventricular tumor: Malignant neoplasm, differential between choroid plexus carcinoma and atypical teratoid rhabdoid tumor and anaplastic ependymoma.
Immunohistochemistry: CTK+, EMA+, GFAP+, NFP-, VIMENTIN+, SYNAPTOPHYSIN+, CD56 focal, BAF-47 absent, SMA+
Electron Microscopy: EM07-513
FINAL DIAGNOSIS: Atypical teratoid / rhabdoid tumour (AT/RT)
This very aggressive tumour with extension into the ventricles was shown to be an atypical teratoid / rhabdoid tumour (AT/RT), which more frequently occur in the posterior fossa. A reasonable differential on imaging in this age group is of a choroid plexus carcinoma.