| Colloid Cyst
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Etiology
•Unknown
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Pathogenesis
•The colloid cyst is thought to arise from the vestigial
paraphysis in the anterior end of the third ventricle
at the level of the foramina of Monroe.,
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Epidemiology
•Colloid cysts are rare tumors of the third ventricle,
making up 2% of glial tumors and seen most often in
young adults.
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General Gross Description
•The colloid cyst consists of a round encapsulated
structure containing a grayish translucent firm material.
which lies just behind the foramina of Monroe and
sometimes impacts itself in the foramina causing
acute hydrocephalus.
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General Microscopic Description
•The tumor has a collagenous capsule lined by columnar
to cuboidal cells.
•The central PAS positive material may
contain macrophages or debris.
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Clinical Correlation
•Since the colloid cyst is just behind the foramina of
Monroe, it can move into a position occluding one or
both of the foramina causing an acute rise in intracranial pressure with
symptoms are severe headache which may be
intermittent as the tumor occludes and unoccludes the
foramina.
•If the rise in intracranial pressure is
severe enough or prolonged enough the patient may become
comatose or die.
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References
• Poirer J et.al. Manual of basic neuropathology. Philadelphia: Saunders, 1990, pp. 29-30.
• Cotran RS, Kumar V, Robbins SL: Robbins Pathologic Basis of Disease. 5th ed. Philadelphia, W.B. Saunders, 1994, pp. 1346.
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| Colloid Cyst
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| Synopsis by: M.L. Grunnet M.D. (TX2000M33400)[370]
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