Pineocytoma
| Pineocytoma | |
|---|---|
 Micrograph of a pineocytoma. HPS stain. | |
| Classification and external resources | |
| Specialty | oncology |
| ICD-10 | C75.3 |
| ICD-O | M9361/1 |
| MeSH | D010871 |
Pineocytoma, also known as a pinealocytoma, 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) 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.
See Also
References
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