Pineocytoma

Pineocytoma
Other names	Pinealocytoma
Micrograph of a pineocytoma. HPS stain.
Specialty	Oncology

Pineocytoma, is a benign, slowly growing tumor of the pineal gland. Unlike the similar condition pineal gland cyst, it is uncommon.

Diagnosis[]

Pineocytomas 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)^{[citation needed]} and,
• have the characteristic pineocytomatous/neurocytic rosettes, which is an irregular circular/flower-like arrangement of cells with a large meshwork of fibers (neuropil) at the centre.^[1] Pineocytomatous/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.

Management[]

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See also[]

• Pineal gland

References[]

External links[]