Abstract
Testicular adenomatoid tumor is very rare. More understanding of the tumor and treatment is required for better outcomes. A 63-year-old man visited a urologist for staghorn calculus. During follow-up, he had recurrent left flank pain and intermittent hematuria. Computed tomography demonstrated left staghorn calculus, and then further assessment revealed left testicular swelling. Ultrasound showed epididymal mass. Percutaneous nephrolithotomy was deferred and we performed left radical orchiectomy. A pathologic examination revealed testicular adenomatoid tumor. This case highlights the importance of awareness of a very rare benign tumor in a patient with staghorn calculus.