<prompt> Homer wright rossette are seen in-a Neuroblastomab Astrocytomac Meningiomad Pinealomaadcacab  <response>: RosettesRosettes are pathological findings characterized by a halo or spoke wheel arrangement of cells surrounding a central core or hub.Type of Rosette1. Flexner - Wintersteiner RosettesA halo of cells surrounds a largely empty central hub but small cytoplasmic extension from cells project into the lumen.It is characteristic of retinoblastoma.May also be seen in Medulloblastoma, Primitive neuroectodermal tumor, Pineoblastoma.2. Homer Wright rosettesA halo of cells surrounds a central hub that contains a meshwork of fibres neutrophil rich centre.Homer-Wright rosettes are characteristic of neuroblastomas and medulloblastomas.May also be seen in Primitive neuroectodermal tumors PNET, Pineoblastomas, Retinoblastomas.3. True ependymal RosetteA halo of cells surrounds an empty lumen.It is characteristic of ependymomas.4. Perivascular pseudorosettesA halo of cells surrounds a blood vessel.The term pseudo is used because the central structure is not formed from the tumor itself, and represents a nonneoplastic element.May be seen inEpendymonasGlioblastomasMedulloblastomasRetinoblastomaPrimitive neuroectodermal tumors Monimorphous pilimyxoid astrocytomaCentral neurocytoma 