RT Journal Article SR Electronic T1 Asymptomatic nutcracker phenomenon: entrapment of the left renal vein shown by CT without left flank or pelvic pain, or macroscopic haematuria JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e233867 DO 10.1136/bcr-2019-233867 VO 13 IS 1 A1 Masaki Tago A1 Naoko E Katsuki A1 Yuka Hirakawa A1 Shu-ichi Yamashita YR 2020 UL http://casereports.bmj.com/content/13/1/e233867.abstract AB