ABSTRACT
A patient with advanced lung adenocarcinoma developed symptoms of frequent urination and urgent urination after 14 cycles of Pembrolizumab combined with chemotherapy. After making comprehensive analysis of the results of urine routine test, renal function, cystoscope and computed tomography (CT) examination, immune checkpoint inhibitors related cystoureteritis and acute kidney injury were considered. The patient's symptoms were relieved after discontinuation of Pembrolizumab combined with chemotherapy. However, the symptoms of urinary irritation worsened significantly after rechallenging Pembrolizumab combined with chemotherapy, and the symptoms was relieved after corticosteroids treatment. If patients develop urinary symptoms during immune checkpoint inhibitors treatment, immune checkpoint inhibitors related cystoureteritis should be considered for early differential diagnosis in order to implement appropriate treatment. .