ODP631 Infectious Disease Causing Damage Of The Adrenal Glands, A Life Threating Event

INTRODUCTION: Primary Adrenal Insufficiency (PAI) is not a common cause of adrenal insufficiency. The most common cause is Addison disease that is an autoimmune condition. Other causes include hemorrhage, infiltration, infections, necrosis and metastasis. We present a rare case of primary adrenal insufficiency caused by disseminated histoplasmosis. CASE PRESENTATION: 87 yo male from the Midwest with a history of HTN, HLD, CAD s/p CABG was admitted to our hospital for fatigue and 15 lbs weight loss. In the ED, he was found to have persistent hypoglycemia (BG in the 50s mg/dl after several vials of D50%). He was admitted to ICU for continuous D10% infusion. His laboratory showed Na 137mmol/L, K 3.7mmol/L. Further work up for hypoglycemia showed BG of 53 mg/dl with C-peptide of 0.92ng/ml and Insulin <1uIU/ml. Due to the concern of non-insulin dependent hypoglycemia, AM cortisol was done which was low7ug/dl. Immediately, he was started on high dose hydrocortisone. Head CT was negative for pituitary lesions. CT showed lung nodules and bilateral peripherally calcified adrenal lesions 3.6 & 2.6 cm homogenous, well defined borders (HU 20-30). Adrenal hormones work up showed normal metanephrines, Aldosterone <1ng/dl and PRA 1.35ng/ml/h (0.25-5.82). ACTH stim test revealed cortisol level of 9. 0 ug/dl, 9.4 ug/dl, and 9.2 ug/dl at baseline, 30min and 1hr respectively with a baseline ACTH of 539. Lung biopsy showed necrotizing granuloma and fungal spores compatible with histoplasmosis. He was started on amphotericin then transition to itraconazole for 1 year. Additionally, the dose of HC was decrease and Fludrocortisone 0.1mg daily was added. He refused adrenal biopsy at that point and wanted to continue current treatment with a plan to repeat imaging in 3 months and possible adrenal biopsy depending on CT results. On follow-up, patient regained weight and hypoglycemia resolved. Repeated adrenal CT showed shrinkage of the adrenal nodules bilateral. He was continued on PAI replacement. DISCUSSION: Histoplasmosis is a fungal infection caused by (H. capsulatum), found in soil contaminated with bird or bat droppings. Infection usually limited to respiratory disease in immunocompetent host but may cause disseminated infection in immunocompromised patient which can involve any organ system. Less commonly, disseminated type may occur in an immunocompetent host with the adrenal gland being the most common infected organ. Treatment involves systemic antifungal therapy; ketoconazole or itraconazole for mild-moderate forms and amphotericin B for 12-18 months for severe ones. Relapse rate is high; ∼ 7.5% and most patients require long-term glucocorticoid replacement. Because unrecognized disseminated histoplasmosis accompanying PAI usually results in a high mortality rate, considerable suspicion and appropriate investigations are necessary for correct diagnosis of this rare but treatable disease. Presentation: No date and time listed