What is the rare type of diabetes that stops your pituitary gland from makin adh (vasopressin)?

Diabetes insipidus: Diabetes insipidus is caused by a lack of production of antidiuretic hormone by the posterior pituitary gland. It is not related in any way to diabetes mellitus, which is the kind of diabetes characterized by elevated blood sugar. (diabetes refers to the production of a large amount of urine, a symptom shared by both conditions), but in all other ways they are completely different.