Endourology & Stone Disease(구연) Oral Session 6 / Endourology & Stone Disease (Ⅰ) (O-058) Crystal A (3F) 11월28일(수) 14:00-15:00 일회용 연성요관경(Lithovue®)을 이용한 신장 하극 결석 치료의 유용성 원광대학교 의과대학 비뇨기과학교실 오태훈,이재환,박승철,정희종,서일영 Purpose To evaluate the efficacy of the disposable flexible ureterorenoscopy (Lithovue®) for lower pole renal stone. Material and Method From January 2016 to December 2016, patients who underwent retrograde intrarenal surgery (RIRS) used by Lithovue® after diagnosing lower calyceal stone at our hospital were included in study. Patients who did not have follow-up, or who did not have any evidence of stones free were examined through general urinalysis, plain radiography (KUB, DIP), and computed tomography were excluded. Stone free was defined as the absence of any residual disease, or a remnant of less than 3 mm without any symptoms. Results A total of 45 patients were enrolled in study. The mean age of the patients was 54.5±11.4 years and the male to female ratio was 29 (64.4%) to 16 (35.6%). The mean stone burden was 16.9±8.9 mm and mean Hounsfield Unit (HU) was 773.8±379.1. The stone composition was calcium oxalate monohydrate (29, 64.4%), uric acid (10, 22.2%), carbonite apatite (2, 4.4%). The 3-month stone free rate of the disposable flexible ureterorenoscopy (Lithovue®) was 80.0% (36/45) and the mean remnant stone size was 6.33 mm. The mean infundiblur pelvic angle (IPA) was 46.4±9.1 degrees and mean IPA of remnant stone patients was 44.2±7.8 degrees. Conclusions Our results show that Lithovue® is effective treatment for lower calyceal stone as like the results of reusable flexible ureterorenoscopy. Although our cases is small, if we have more cases and overcome learning curve, Lithovue® The high success rate results support Lithovue® as the effective treatment for lower calyceal stone. keywords : low pole stone, Lithovue®