Abstract
An atypical teratoid rhabdoid tumour (AT/RT) is an extremely rare malignant neoplasm. Cerebrospinal fluid (CSF) involvement at presentation indicates intracranial dissemination and is associated with an aggressive course and worse outcomes. We present the characteristic cytomorphological features of AT/RT in the cerebrospinal fluid from a toddler presenting with a posterior fossa space-occupying lesion.
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