A form of diabetes insipidus that manifests during pregnancy (or in some cases, after pregnancy). It is characterized by theappearance of a polyuric-polydipsic syndrome that resultsin fluid intake ranging from 3 to 20 L/day. It is also charac-terized by excretion of abnormally high volumes of dilutedurine. This polyuria is insipid, i.e., the urine concentrationof dissolved substances is very low.