Affiliation:
1. Department of Urology Kagawa University Faculty of Medicine Miki‐cho Kagawa Japan
2. Departments of Diagnostic Pathology, Faculty of Medicine Kagawa University Miki‐cho Kagawa Japan
3. Department of Dermatology Kagawa University Faculty of Medicine Miki‐cho Kagawa Japan
Abstract
IntroductionSkin tissue contamination within transcutaneous visceral organ biopsies is seldom found. We encountered a rare case of extramammary Paget's disease incidentally diagnosed by prostate biopsy during active surveillance for prostate cancer.Case presentationA 71‐year‐old Japanese patient was diagnosed with prostate cancer, and active surveillance was selected. After 1 year, prostate biopsy was performed by a transperitoneal approach, and 16 biopsy cores were taken. One biopsy core contained skin tissue showing extramammary Paget's disease. Careful skin examination confirmed the presence of an extramammary Paget's disease lesion in the left perineum, and curative surgical resection was performed. Recurrence and metastasis did not occur after 6 months of follow‐up.ConclusionAlthough the perianal region is a common site of extramammary Paget's disease, early‐stage extramammary Paget's disease is often asymptomatic. Thus, during a transcutaneous biopsy, it is important to consider the appearance of the skin and the pathological features of migrating skin tissue.