Pinealoma
American Heritage Stedman's Medical Dictionary:
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pin·e·a·lo·ma
(pĭn'ē-ə-lō'mə, pī'nē-)
n., -mas or pin·e·a·lo·ma·ta (-mə-tə).
n., -mas or pin·e·a·lo·ma·ta (-mə-tə).
A neoplasm derived from the pineal body and characterized by large, round, or polygonal cells with large nuclei and small cells that resemble lymphocytes.
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Pinealoma
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pinealoma
IN BRIEF: n. - Tumor of the endocrine gland located in the brain which secretes melatonin.
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Saunders Veterinary Dictionary:
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pinealoma
A rare tumor of the pineal body composed of neoplastic nests of large epithelial cells; it may cause hydrocephalus, precocious puberty and gait disturbances.
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Pinealoma
| Pinealoma | |
|---|---|
| Classification and external resources | |
 Pineocytoma |
|
| ICD-10 | D44.5, C75.3 |
| ICD-9 | 237.1, 194.4 |
| ICD-O: | M9360/1-9362/3 |
| DiseasesDB | 10044 |
| eMedicine | med/2911 |
| MeSH | D010871 |
Pinealoma is a tumor of the pineal gland.
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Contents
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Presentation
The pineal gland produces the hormone melatonin which plays a role in regulating circadian rhythms. A pinealoma may disrupt production of this hormone, and insomnia may result.
Frequently, paralysis of upward gaze along with several ocular findings known collectively as Parinaud's syndrome[1] are the only physical symptoms seen. This is caused by the compression of the vertical gaze center in the midbrain tectum at the level of the superior colliculus and cranial nerve III. Patients may also present with pupillary disturbances and eyelid retraction (Collier's sign).
A pinealoma may cause interruption of hypothalamic inhibiting pathways, sometimes leading to beta-hCG secretion and consequent Leydig's cell stimulation.
Other symptoms may include hydrocephalus, gait disturbances, and precocious puberty.
Etiology
Pinealomas can be due to proliferation of primary pineocytes (pineocytomas, pineoblastomas), astrocytes (astrocytoma), or germ cells (germinoma).[2] Germinomas are the most common tumor in the pineal gland.
Prognosis
Of the different types of pinealomas, the type with the most favorable prognosis is the pineocytoma. [3]
References
- ^ Gaspar N, Verschuur A, Mercier G, Couanet D, Sainte-Rose C, Brugières L (September 2003). "Reversible hearing loss associated with a malignant pineal germ cell tumor. Case report". J. Neurosurg. 99 (3): 587–90. doi:10.3171/jns.2003.99.3.0587. PMID 12959450.
- ^ "eMedicine - Germinoma, Central Nervous System : Article by Daniel D Mais, MD". http://www.emedicine.com/med/topic2246.htm. Retrieved 2007-12-03.
- ^ Deshmukh VR, Smith KA, Rekate HL, Coons S, Spetzler RF (2004). "Diagnosis and management of pineocytomas". Neurosurgery 55 (2): 349–55; discussion 355–7. doi:10.1227/01.NEU.0000129479.70696.D2. PMID 15271241.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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