<prompt> A patient with polyuria and polydipsia is newly diagnosed with central diabetes insipidus DI. Which of the following is the most likely finding on magnetic resonance imaging MRI of the brain?hypothalamic tumorhyperintense signals in the cerebral cortexagenesis of the corpus callosumlack of hyperintense signals from the posterior pituitary  <response>: Because diabetes insipidus is usually caused by destruction, or agenesis, of the posterior pituitary, its normal signaling is lost. Pituitary diabetes insipidus can also result from trauma, tumors both primary and secondary, granulomas, infections, inflammatory diseases, chemical toxins, congenital malformations, and genetic disorders.Depending on the cause, the MRI may demonstrate other associated findings. 