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Blake's pouch cyst (BPC), or persistent Blake's pouch, is a condition that arises when Blake's pouch, an invagination in the fourth ventricle that ruptures at around 4 months of gestation to form the foramen of Magendie (medial aperture), fails to rupture. This can lead to a dilated fourth ventricle and subsequent hydrocephalus of all four ...
Craniopharyngioma is a rare, usually suprasellar [15] neoplasm, which may be cystic, that develops from nests of epithelium derived from Rathke's pouch. [16] [17] Rathke's pouch is an embryonic precursor of the anterior pituitary. [citation needed] Craniopharyngiomas are typically very slow-growing tumors.
Rathke's pouch is a sac-like structure that gives rise to the pars distalis, pars intermedia, and pars tuberalis of the pituitary gland. The cells of Rathke's pouch proliferate and differentiate into various hormone-producing cells, including Somatotrophs, Lactotrophs, Corticotrophs, Thyrotrophs, and Gonadotrophs.
While the pathogenesis of cervical thymus cyst is still unclear, there are two main mechanisms by which this lesion occurs: Congenital: During the fetal development, the thymus forms from the third branchial pouch which descends lateral to the mediastinum toward the thyroid gland. A remnant of this thymic tissue can persist during its descent ...
The cyst wall is composed of squamous epithelium (90%), columnar cells with or without cilia, or a mixture of both, with lymphoid infiltrate, often with prominent germinal centers and few subcapsular lymph sinuses. The cyst is typically surrounded by lymphoid tissue that has attenuated or absent overlying epithelium due to inflammatory changes.
Fetus in fetu (or foetus in foetu) is a rare developmental abnormality in which a mass of tissue resembling a fetus forms inside the body of its twin. An early example of the phenomenon was described in 1808 by George William Young. [1] There are two hypotheses for the origin of a fetus in fetu.
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The thyroid gland starts developing in the oropharynx in the fetus and descends to its final position taking a path through the tongue, hyoid bone and neck muscles. The connection between its original position and its final position is the thyroglossal duct.