Pinealoma

Infobox_Disease
Name = PAGENAME


Caption = Pineocytoma
DiseasesDB = 10044
ICD10 = ICD10|D|44|5|d|37
ICD9 = ICD9|237.1, ICD9|194.4
ICDO = M9360/1
OMIM =
MedlinePlus =
eMedicineSubj = med
eMedicineTopic = 2911
MeshID = D010871

Pinealoma is a tumor of the pineal gland.

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 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).cite web |url=http://www.emedicine.com/med/topic2246.htm |title=eMedicine - Germinoma, Central Nervous System : Article by Daniel D Mais, MD |accessdate=2007-12-03 |format= |work=] 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. cite journal |author=Deshmukh VR, Smith KA, Rekate HL, Coons S, Spetzler RF |title=Diagnosis and management of pineocytomas |journal=Neurosurgery |volume=55 |issue=2 |pages=349–55; discussion 355–7 |year=2004 |pmid=15271241 |doi=]

References

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External links

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