This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
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? 
Select and explain. 
A. hypothalamic tumor, B. hyperintense signals in the cerebral cortex, C. agenesis of the corpus callosum, D. lack of hyperintense signals from the posterior pituitary
D: lack of hyperintense signals from the posterior pituitary
Answer: D: lack of hyperintense signals from the posterior pituitary 
Explanation: 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.