Background/aim: Immature teratomas (IMT) are malignant germ cell tumours composed of immature embryonal tissue, mostly neuroectodermal tubules and rosettes. Meanwhile, embryonal tumours with multilayered rosettes (ETMR) are aggressive central nervous system tumours composed of neurocyte proliferation with rosette formation. The histopathological appearance of rosette formation in ETMR is the same as that in IMT.
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