Suprasellar calcification with polyuria seen in -
A suprasellar calcification is typical of craniopharyngioma Polyuria is d/t diabetes insipidus caused d/t compression by the tumor over pituitary. (Schwaz 7/e p1629 writes "Clinically, patients with suprasellar tumors typically present with diabetes insipidus, visual difficulties, or endocrinopathy.") Ref : Sutton's Radiology 7/e p1628
Langerhan cell histocytosis
Medulloblastoma
Pinealoma
Craniopharyngioma
Head and neck