<unk>  is a benign tumor in which a disorganized collection of neurons and glia accumulate at the<unk><unk>  of the hypothalamus on the floor of the third ventricle. It is a congenital malformation, included on the spectrum of gray matter heterotopias. Formation occurs during embryogenesis, typically between days 33 and 41 of gestation. Size of the tumor varies from one to three centimeters in diameter, with the mean being closer to the low end of this range. It is estimated to occur at a frequency of one in one million individuals.
Tuber cinereum hamartoma
Eruptive vellus hair cyst
Ectodermal dysplasia with corkscrew hairs
Rathke's cleft cyst
Ganglion cyst
Trichofolliculoma
Neuroma cutis
Fibrous hamartoma of infancy