Fig. 1

Definitions of EUS findings. a, The form of a homogeneous tumor was protruded. No change was observed in the LHEL. b, The form of a heterogeneous tumor was protruded. The LHEL became thick (arrows). c, The form of a heterogeneous tumor was wide. The LHEL became thick (arrows). d, The form of a heterogeneous tumor was wide. The LHEL became narrow (arrows). LHEL, lateral hyperechoic layer