Granulomatosis With Polyangiitis Manifesting With Diabetes Insipidus and Cranial Nerve Involvement: A Case Report and Review of the Literature.

This report describes a rare case of granulomatosis with polyangiitis presenting with diabetes insipidus and third cranial nerve involvement. Given the wide range of vasculitis presentations, this case highlights the importance of considering such diagnoses in patients with diverse signs and symptoms to prevent misdiagnosis or delayed diagnosis and to utilize targeted laboratory and paraclinical studies based on clinical suspicion to achieve an accurate diagnosis.