Colloid Cyst of the Third Ventricle

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A colloid cyst occurs in adults. Its size varies from a few millimeters to 3 to 4 cm.

The smooth cystic wall attaches to the choroid plexus, and may adhere to the fornices and the wall of the third ventricle. The content is mucinous (Fig. 11.39). The cyst intermittently blocks the foramen Mono and

figure 1 1.38

Epidermoid cyst in a 33-year-old mentally retarded epileptic man. A. A large cystic tumor situated in the pineal region compresses the tectum and the aqueduct. It breaks into the third and enlarged lateral ventricles. Small fragments of glossy material are deposited on the ventricular wall. B. The cyst wall consists of squamous epithelial cells, and the lumen contains keratin arranged in concentric lamellae. C. The ventricular wall shows epedymitis with foreign-body giant cells.

figure 1 1.38

Epidermoid cyst in a 33-year-old mentally retarded epileptic man. A. A large cystic tumor situated in the pineal region compresses the tectum and the aqueduct. It breaks into the third and enlarged lateral ventricles. Small fragments of glossy material are deposited on the ventricular wall. B. The cyst wall consists of squamous epithelial cells, and the lumen contains keratin arranged in concentric lamellae. C. The ventricular wall shows epedymitis with foreign-body giant cells.

figure 1 1.39

Colloid cyst of the third ventricle. A 35-year-old woman who suffered from severe headaches died suddenly. Transverse section at the thalamus level shows a cherry-sized colloid cyst blocking the foramen Monro. The lateral ventricles are moderately dilated. Separation of corpus callosum is artifactual.

figure 1 1.39

Colloid cyst of the third ventricle. A 35-year-old woman who suffered from severe headaches died suddenly. Transverse section at the thalamus level shows a cherry-sized colloid cyst blocking the foramen Monro. The lateral ventricles are moderately dilated. Separation of corpus callosum is artifactual.

gradually leads to hydrocephalus. Clinically, the colloid cyst presents with headaches, often precipitated and aggravated by head movements. Due to obstruction of the foramen Mono and a sudden rise of ICP, death may occur suddenly. Histologically, the cyst wall contains cuboidal and columnar epithelial cells and mucin-producing cells.

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