8142 Endocrine Considerations Prior to Pituitary Tumor Resection

Abstract Disclosure: P. Einafshar: None. T. Delibasi: None. Endocrine Considerations in Pituitary Tumor Resection Introduction: Diabetes Insipidus (DI) is an endocrine condition involving a disturbance to the action of Anti-Diuretic Hormone (ADH) resulting in polyuria, and polydipsia with complications such as severe water and electrolyte disturbances. It can be classified into Central DI which affects the secretion of ADH or Nephrogenic DI which affects peripheral ADH receptors in Distal Convoluted Tubules (DCTs) in the renal system. Both subtypes however present similarly and are usually known to be transient. It is important to consider the most common etiologies contributing to both central and nephrogenic DI as severe complications may arise if not diagnosed and treated promptly. The most important step is to monitor and manage water and electrolytes and avoid excessive water loss which can lead to irreversible complications. This can be accomplished by introducing synthetic ADH called DDAVP or Desmopressin. Case Description: A 57-year-old female was admitted in preparation for a supra-orbital resection of a suprasellar mass. Two hours post-procedure, she was found to have an increase in urine output with her labs notable for a significant acute increase in serum sodium and a decrease in urine osmolality. Upon emergent Endocrinology evaluation, due to concerns of Acute Diabetes Insipidus in the setting of insult to the pituitary stalk, she was started on emergent treatment with IV DDAVP. Her course was complicated with persistent DI resulting in a case of permanent DI requiring out-patient daily treatments with DDAVP. Discussion: Injury to the pituitary stalk resulting in various endocrine abnormalities has been studied involving a trans-sphenoidal resection of pituitary tumors, but there is a paucity of cases reported when patients undergo a supra-orbital surgical approach. It is vital for Endocrinology and Neurosurgical services to be aware of this phenomenon, and a multi-disciplinary approach to patient management should be considered. Furthermore, close follow-up of pituitary hormones in the post-operative setting is imperative in order to avoid severe complications, such as brain damage or poor mental status. We hope to educate residents and fellows about this phenomenon that is rarely reported in the literature but can have profound effects on patient’s quality of life if not considered by the consulting Endocrinology team. References Christ-Crain, M., Winzeler, B., & Refardt, J. (2021). Diagnosis and management of diabetes insipidus for the internist: an update. Journal of internal medicine, 290(1), 73-87. Mutter, C. M., Smith, T., Menze, O., Zakharia, M., & Nguyen, H. (2021). Diabetes insipidus: pathogenesis, diagnosis, and clinical management. Cureus, 13(2). Presentation: 6/1/2024