WordNet

a cluster of leaves growing in crowded circles from a common center or crown (usually at or close to the ground)
an ornament or pattern resembling a rose that is worn as a badge of office or as recognition of having won an honor
of or relating to neuroglia

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Synchronous rosette-forming glioneuronal tumor and diffuse astrocytoma with molecular characterization: a case report.

Cachia D, Prado MP, Theeler B, Hamilton J, McCutcheon I, Fuller GN.
Clinical neuropathology.Clin Neuropathol.2014 Jul 2. [Epub ahead of print]
Rosette-forming glioneuronal tumor (WHO grade I) is a rare neoplasm primarily arising in young adults that is characterized by distinctive neurocytic rosette formation, a spindled glial component resembling pilocytic astrocytoma, and a high incidence of PIK3CA mutation. Low-grade diffuse astrocytoma
PMID 24986181

A case report of an ependymoblastoma in the rectovaginal space and a review of the literature.

Smolle E1, Smolle M, Ronaghi F, Rogatsch H, Moinfar F, Haybaeck J.
Anticancer research.Anticancer Res.2014 Feb;34(2):819-27.
INTRODUCTION: Ependymomas are glial neoplasms that arise at or close to the inner ependymal surface of the ventricular system. They are most frequently located intraventricularly, but they may also occur in the spinal cord or, very seldom, at extraneural sites. Here we report a case of an ectopic ep
PMID 24511018

Rosette-forming glioneuronal tumor of the fourth ventricle with neurocytoma component.

Chiba K1, Aihara Y, Eguchi S, Tanaka M, Komori T, Okada Y.
Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery.Childs Nerv Syst.2014 Feb;30(2):351-6. doi: 10.1007/s00381-013-2216-3. Epub 2013 Jul 2.
Rosette-forming glioneuronal tumor (RGNT) was first published in 2002 and was described as a benign and indolent tumor. It was also included in the 2007 World Health Organization (WHO) classification of tumors as a grade 1 tumor for its benign clinical behavior and the possibility of surgical cure.
PMID 23817994