Patients
tumor, papillary thyroid cancer, Cancer
CANCER, TUMOR, METASTASIS, PAPILLARY THYROID CANCER, PATHOLOGY, THYROID CANCER
The study's operational flowchart is depicted in Figure The following were the criteria for inclusion: (1) patients with papillary thyroid cancer were diagnosed by postoperative pathology; (2) preoperative thyroid ultrasound examination and surgery were performed at Tianjin Medical University Cancer Hospital; (3) all patients were under 18 years of age.The exclusion criteria were as follows: (1) patients at our institution who did not have preoperative thyroid ultrasonography; (2) patients who underwent thyroidectomy in other hospitals and only underwent cervical lymph node dissection in our hospital; (3) patients with incomplete ultrasound and pathophysiological information; (4) other types of thyroid cancer; and (5) preoperative imaging examination confirmed distant metastasis.Age, sex, and clinical data, including tumor location and pathological features, were retrieved from medical records. This retrospective study was authorized by the Cancer Institute and Hospital of Tianjin Medical University's local ethics council, and informed consent was not necessary.