DIAGNOSTIC STRATEGIES IN PEDIATRIC IMAGING

Magnetic resonance imaging is the modality of choice to visualize the pituitary gland. In pituitary dwarfism with growth hormone deficiency, neuroimaging can be normal or can disclose abnormalities: (1) Tumors, mainly craniopharyngiomas. These benign tumors vary greatly in size a nd composition (calcifications, a cystic component in approximatively 80% of cases, typically with high signal intensity on T-1-weighted ima ges). (2) Classical midline malformations such as septo-optic dysplasi a or corpus callosum agenesis. (3) Recently described minor malformati ons: pituitary hypoplasia, pituitary stalk aplasia, and translocation of the pituitary bright spot to the median eminence called an 'ectopic ' posterior lobe. All these malformations can be isolated or associate d. (4) Pituitary adenomas (prolactinomas), which are not frequent in c hildren.