Cysts and nodules are both part of the imaging examination for the diagnosis of lesions, there will be some differences between the two, the main difference is that the composition is not the same, the results of the imaging examination is not the same, the care program is not the same. 1. Different components: the main component of the cyst is liquid, or secretion of water absorption after the formation of paste, mainly due to various reasons for the accumulation of liquid caused by; nodules generally indicate soft tissue lesions, and cell proliferation. 2. Different imaging results: imaging results of cysts are liquid, smooth edges, not accompanied by blood supply; the nodule itself can be manifested as irregular edges, irregular morphology, through ultrasound and other examinations may have blood supply. 3. Different treatment programs: cysts generally do not require too much intervention, the volume is particularly large can be done surgical drainage; nodules generally need to be closely observed, there may be malignant need for puncture biopsy, radical surgical resection if necessary. Through the examination of the lesions found, must pay attention to the combination of enhanced examination for comprehensive judgment, to determine the specific cause of the disease and then do standardized treatment.