摘要目的:通过对特发性孤立性促肾上腺皮质激素(ACTH)缺乏症(idiopathic isolated ACTH deficiency，IIAD)患者的临床资料分析、随访，总结疾病临床特征，揭示演变规律，加深对该疾病的认识。方法:回顾性分析本中心收治的12例IIAD患者的临床特点，并对患者进行随访，总结这些患者的临床特征。结果:12例IIAD患者，男女比例为3∶1，呈双峰发病趋势，2例为18岁以下发病(分别为1岁和11岁)，10例为成人发病，平均发病年龄59.4岁。成人以长期乏力、纳差、体重下降为主要症状，儿童患者可以出现低血糖及癫痫发作。低钠血症(50%)是常见的生化异常。所有患者ACTH、皮质醇、24 h尿游离皮质醇(UFC)均明显低下，垂体其他腺轴功能均正常。除2例患者垂体MRI显示空泡蝶鞍外，余患者均正常。最常见的伴随疾病是桥本甲状腺炎。经糖皮质激素替代治疗后，所有患者症状改善，替代剂量为醋酸泼尼松2.5~7.5 mg/d或氢化可的松12~20 mg/d。随访的8例患者均健在，ACTH缺乏状态持续存在，未出现垂体其他腺轴功能减退，亦未出现其他疾病。结论:IIAD患者呈双峰发病，男性多见，症状长期稳定存在，而不缓解，生理剂量糖皮质激素替代治疗预后良好。

abstractsObjective:To summarize the clinical characteristics, reveal evolutionary patterns, and enhance the understanding of idiopathic isolated adrenocorticotripin(ACTH)deficiency(IIAD)by conducting a clinical analysis and follow-up.Methods:The clinical data of 12 patients with IIAD in our center were analyzed retrospectively, and the patients were further followed up to summarize the clinical characteristics of these patients.Results:Among 12 patients with IIAD, the ratio of male to female was 3∶1. The onset showed a bimodal trend, with 2 cases occurring below the age of 18(at 1 year and 11 years respectively), and 10 cases occurring in adults, with an average onset age of 59.4 years old. In adults, the main symptoms were chronic fatigue, anorexia, and weight loss, while pediatric patients exhibited hypoglycemia and seizures. Hyponatremia(50%)was a common biochemical abnormality. ACTH, cortisol, and 24 h urinary free cortisol were significantly lower in all patients, and the functions of other pituitary gland axes were normal. All patients were normal except 2 patients with pituitary MRI showing vacuolar sella turcica. The most common accompanying disease was Hashimoto thyroiditis. After glucocorticoid replacement therapy, all patients showed symptom improvement. The replacement doses include prednisone acetate at 2.5-7.5 mg/d or hydrocortisone at 12-20 mg/d. All the 8 patients were still alive with ongoing ACTH deficiency, without any decline in other pituitary axis functions or occurrence of other diseases.Conclusion:IIAD exhibits a bimodal onset pattern with a higher prevalence in males. Symptoms persist in a chronic and stable manner without remission. Prognosis is favorable with physiological dose of glucocorticoid replacement therapy.