Abstract
Peripheral lymph fistula （PLF） may improve hearing prognosis with early surgical treatment. From April 2014 to October 2014, we performed endoscopic lymph fistula closure in seven cases suspected of PLF in our hospital. Cochlin-tomoprotein （CTP） was positive in six of the cases. Average hearing level improved by more than 15 dB in five of the six CTP positive cases. Only four cases showed signs of leakage of perilymph fluid during surgery. In endoscopic surgery, it was possible to obtain a good operative field only with an arc-shaped incision of the external ear canal, and it was possible to diagnose leakage of perilymph fluid and to close the fistula with low invasion. CTP is useful because it can objectively diagnose leakage of perilymph fluid.
