Pediatrics(구연) Oral Session8 / Pediatrics (O-088) Rm.203 10월 30일(수) 16:00-17:00 Concealed index of concealed penis of prepubertal children 부산대학교 의과대학 비뇨의학과교실 Jae Min Chung, Sang Don Lee Purpose: There is no consensus on patient eligibility for the repair of the concealed penis (CP). To make an objective severity index of CP, we compared the penile parameters of CP with normal boys. Materials and Methods: In this cohort study, 444 boys with ages ranging from 6 months to 10 years who visited our hospital between June 2017 and May 2019 were included. Among these boys, 78 patients had a CP and 366 boys had a normal penis (NP) without CP. The stretched penile length (SPL), penile circumference (PC) and penile length above baseline skin level (BPL) were measured using a ruler (cm), and testicular volume was measured using orchidometry (ml). SPL was the distance from the base of the penis under the pubic symphysis to the tip of the glans. BPL was the distance from the baseline penile skin level to the tip of the glans. We defined the concealed index with SPL (CIs) as BPL/SPL, and the concealed index with circumference (CIc) as BPL/PC. Results: There was no difference between CP and NP in age, height, weight, BMI, penile circumference and testis volume. However, CP had significant smaller SPL, BPL, CIs, and CIc than NP (Table). Cutoff values of CIs and CIc were 0.53 and 0.59 (sensitivity 51.9 and 88.3%, specificity 94.8 and 80.6%) (Figure). After repair of CP, SPL, BPL, and CI were higher than preoperative findings. Conclusions: The CIs and CIc are a useful and objective parameter for checking the severity of CP. We newly introduce the cutoff value of CIs (0.53) and CIc (0.59) for diagnosis and indication of repair of CP. keywords : Penis, Penile diseases, Severity of illness index, Reconstructive surgical procedures, child