| Homer-Wright rosettes | Pseudorosettes formed by the arrangement of tumour cells around an area of fibrillarity, evidence of neuroblastic differentiation in a medulloblastoma or primitive neuroectodermal tumour. (05 Mar 2000) |
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| Wintersteiner rosettes | Rosette's found only in retinal embryonic tumours, formed by a group of columnar cells with a peripheral basement membrane arranged in a radial manner around a central cavity, the spokes corresponding to the photoreceptors. (05 Mar 2000) |
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| E rosettes | <haematology> The clustering of sheep erythrocytes around a leucocyte or other cell. E rosette formation is used as a marker for T lymphocytes of humans and most mammals, in this case erythrocytes are untreated, compared with other rosette tests such as EA where erythrocytes have antibody bound to their surface. (06 Mar 1998) |