<unk> s are diagnosed from tissue, i.e. a brain biopsy.They consist of: *cytologically benign cells (with nuclei of uniform size, regular nuclear membranes, and light chromatin) and, *have the characteristic<unk> tous/neurocytic rosettes, which is an irregular circular/flower-like arrangement of cells with a large meshwork of fibers (neuropil) at the centre.<unk> tous/neurocytic rosettes are superficially similar to Homer Wright rosettes; however, they differ from Homer Wright rosettes as they have (1) more neuropil at centre of the rosette and, (2) the edge of neuropil meshwork irregular/undulating.
Pineocytoma
Oncocytoma
Brown tumor
Myxoma
Melanocytoma
Histiocytoma
Mastocytoma
Glomus tumor