Abstract: Objective To study clinical ultrasonography characteristics on parathyroid cysts, so as to avoid misdiagnosis of that in clinic.Methods The ultrasonic image data on parathyroid cyst of 3 misdiagnosed cases hospitalized from June 2012 to May 2013 were retrospectively analyzed.Results The foci of 3 cases were located in the dorsal area under the left lobe distal polar of thyroid, and were confirmed by surgery and pathology. The common performance of ultrasonic images:round or oval anechoic area, clear boundary, integrity membrane, thin and smooth wall. The envelop between parathyroid cyst and thyroid presented with acute angle.Conclusion In thyroid ultrasonic examination, lesions in the parathyroid gland area, especially around the inferior pole of thyroid, should be considered to be differentiated from that of parathyroid disease.