Atypical teratoid rhabdoid tumor (ATRT)


Suggested by MRI and confirmed by pathology (brain biopsy/resection)

Findings on Investigations:

Posterior fossa > supratentorial



  • Small round blue cell tumor, with rhabdoid cells= eccentric nucleus with prominent nucleolus, eosinophilic cytoplasmic inclusions,
  • Immunohistochemistry: INI1 negative (distinguishes it from choroid plexus carcinoma which is INI1 positive, but this is not a perfect test), EMA positive, smooth muscle actin positive, Cytokeratin positive, GFAP= positive

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