CORRELATION BETWEEN ULTRASOUND-BASED ACR TI-RADS AND BETHESDA SYSTEM FOR REPORTING THYROID-CYTOPATHOLOGY: A PROSPECTIVE STUDY AT TERTIARY CARE
CENTER IN EASTERN INDIA
BACKGROUND: Ultrasound(USG) is the initial imaging tool for the assessment of thyroid lesions, due to its easy availability and no radiation risk.USG based TIRADS uses particular lexicons for reporting a focal thyroid nodule,based on which risk of malignancy is calculated and finally a TIRADS category is assigned.The lexicons used are helpful for effective communication between the practitioners. OBJECTIVE:To determine the efficacy of ACR based TIRADS in predicting suspicious thyroid nodules and categorizing the patients in need of further evaluation with FNAC or follow up. MATERIALS AND METHODS: This prospective study was done over a period of 1 year (January 2019–January 2020)and include 50 patients. Patients having thyroid nodules in B-mode ultrasound were included in the study. The nodules were then grouped into their respective categories based on ACR TI-RADS and further management was decided. Pathological correlation using Bethesda classification and cancer risk of each TIRADS category was determined in the follow-up period simultaneously. RESULTS:All the 6 nodules classified under the TIRADS 5 category were found to be malignant while none of the TIRADS 2 nodules out of 29 were malignant i.e.Bethesda IV or higher.The risk of malignancy for ACR TI-RADS categories 1,2,3,4 and 5 was 0, 14.3, 62.5 and 100%, respectively.The risk of cancer in our study is almost comparable to other prominent studies. CONCLUSION:ACR based TIRADS classification is reliable in predicting thyroid malignancy.