Fig. 1From: Ultrasound characteristics of normal parathyroid glands and analysis of the factors affecting their displayRoutine Ultrasound Characteristics of normal PTGs. a-d: Longitudinal and transverse views of the left superior and left inferior PTGs, respectively. e-h: Longitudinal and transverse views of the right superior and right inferior PTGs, respectively. i-l: Internal blood flow signal of PTGs, in the order of grade 0 to grade IIIBack to article page