Illustration of agreement between incisional and ultrasound-guided core needle biopsy of the parotid gland. Different histopathologic features are shown of patients who underwent paired ultrasound-guided core needle biopsy and open biopsy: presence of lymphoepithelial lesions (left), germinal centres (middle) and a focus score of at least one (right). Filled-in dots represent patients who fulfil the 2016 ACR/EULAR classification criteria for primary SS, the empty dots represent patients who don’t. CN: core-needle