The fundus of the gallbladder is diffusely abnormal and characterised by thickening of the gallbladder wall with multiple cystic spaces identified within this segment of the gallbladder wall. Within some of the cystic spaces, there are echogenic foci some of which demonstrate posterior acoustic shadowing consistent with stones. Further echogenic foci which are punctate and show 'comet tail' artefact and are consistent with cholesterolosis. Within the neck of the gallbladder, there is a calculus which is non-mobile.