Giant hypothalamic hamartoma: an unusual neonatal tumor.

A case of neonatal manifestation of giant hypothalamic hamartoma is reported. It is suggested that hypothalamic hamartoma should be included in the list of neonatal intracerebral tumors. Magnetic resonance imaging appearance similar to that of normal gray matter on T1-weighted images and slightly hyperintense on T2-weighted images, without enhancement after gadolinium injection, is suggestive of the diagnosis. Hypothalamic hamartomas are congenital malformations, consisting of disorganized mature neuronal elements in proportions similar to that of normal tissue [1]. They are clinically evidenced in infants ranging from 1 to 7 years of age [1-5]. This report describes a histologically proved giant hypothalamic hamartoma diagnosed in the neonatal period. Magnetic resonance imaging (MRI) is helpful to distinguish this congenital non-evolutive malformation from more aggressive neonatal tumors.