Clinical findings and pathology of a tumor-regressed lymph node. (A) Ulcero-fungating mass in the right buccal area, which proved to be a squamous cell carcinoma. (B) Gross photo of the excised primary tumor. (C-D) Radiation fields for adjuvant radiotherapy, which did not include the left lower neck. (E-F) Pathology view with hematoxylin and eosin staining of the tumor-regressed lymph node.