[Impact of systemic disease on the pituitary gland].

Systemic diseases located in hypothalamo-pituitary region can slowly induce pituitary deficiency, diabetes insipidus and morphological abnormalities. The aim of this study is to review recent clinical data about diagnosis of these rare diseases, with a focus on granulomatous diseases: histiocytosis and sarcoidosis. Recent clinical studies on histiocytosis have improved our knowledge about endocrine expression of the disease in children and in adults as well. Diabetes insipidus is the most frequent condition, described mainly in children. GH deficiency is the most frequent pituitary deficit in children and adult patients. During neurosarcoidosis, diabetes insipidus is the most frequent condition and gonadotropic deficiency is the most frequent deficit but GH has not been systematically studied. MRI allows visualisation of some lesions and is very useful to follow the disease course. Diagnosis of these diseases is made by clinical evaluation of all the sites and by pathological analysis of biopsies of peripheral lesions. While pituitary hormone replacement therapy does not seem to raise specific problems in these diseases, etiological treatments are not yet available and indications for antimitotic or immunomodulatory treatment are sometimes discussed.