Examination methods
The removed tonsils immersed in 10% formalin solutionwere divided into
parts passing through the upper and lower pole, and were fixed in a
paraffin block by the same operator. The paraffin block-was made into
4-5 micron sections and stained with hematoxylin–eosin method. The
pathological section was photographed by KF-PRO-120 digital pathology
panoramic scanner(KFBIO,Yuyao,China), and the necrosis depth was
measured by K-Viewer software(KFBIO,Yuyao,China).