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Permanent central diabetes insipidus after mild traumatic brain injury

Aim: The patients in the permanent diabetes insipidus (DI) group are more likely to have more severe TBI, which is defined by a post-resuscitational and pre-sedational Glasgow Coma Scale (GCS) score of 8/15 or less. This study presents a case of permanent, central DI following mild traumatic brain injury with post-resuscitation GCS 13/15. Case report: A 17-year-old boy suffered from mild brain injury and experienced permanent DI without any anatomical changes on image in the early stage of traumatic brain injury. However, 1 year later, magnetic resonance imaging (MRI) of the brain in this patient has revealed some sequel of contusion. Moreover, the patient still has DI after treatment with diamino-8-D-arginine vasopressin (DDAVP). Conclusion: This patient had a rare clinical presentation of permanent, central DI, following a mild traumatic brain injury. Identification of head trauma as the aetiology of hypopituitarism may be overlooked if there is a long delay in onset after trauma. Since anterior hypopituitarism can develop decades after the episode of head trauma, monitoring for endocrine dysfunction during follow-up of these patients is important.