Postoperative oval hypoechoic light mass of thyroid cancer usually refers to thyroid nodules. If the patient’s imaging examination shows findings such as unclear borders of thyroid nodules, it may be due to recurrence of thyroid cancer, and the patient can undergo puncture examination. Postoperative oval hypoechoic light mass of thyroid cancer is the description of the result of ultrasound examination of thyroid nodule, which generally cannot indicate anything, because only with one examination result cannot judge that the patient has a disease. Patients are advised to pay attention to the boundary of the thyroid nodule, morphology, and whether it is calcified during the examination. If the border of the thyroid nodule is not clear, the shape is irregular and there is calcification, it means that the patient may have thyroid cancer recurrence. If the patient is suspected to have recurrence of thyroid cancer, it is suggested that the patient should go to the hospital in time to do the puncture pathology examination of the nodule, which can accurately determine whether it is a malignant tumor or not.