原发性T环异常 essential T vector change ; primary t loop abnormality

T环异常 T-ring

t环形态 t loop morphology ; t-loop morphology

横面t环 horizontal plane t loop

t环异常 abnormal t loop

继发性T环异常 secondary t loop abnormality

T形环 T-IUD

H面T形环行器 H-plane T circulator