[Diencephalic syndrome. Case report and review of literature].

We report the case of a twenty-three month old, normally eating child, affected by organic macies and severe dystrophy. After the negative response of blood and laboratory examinations let us exclude a malabsorption syndrome, only the performance of neuro-radiologic exams showed evidence of a subthalamic tumor as the cause of a "Diencephalic syndrome". Diencephalic syndrome or Russel's syndrome is a diencephalic tumor induced disease, which sets in the first three years of life. The disease clinical markers are a severe emaciation with appetite preservation and absence or very scarce evidence of any telltale neurological sign. the tumoral histo-pathology most frequently shows a low grade of malignancy astrocytoma, whose eradication is very often difficult because of the particular anatomic site. Choice treatment includes an excisional biopsy associated to chemotherapy and to radiotherapy.