Dear sir/madam. This US finding is very unspecific. Gallbladder stones can cause such symptoms, so called biliary colics which are usually associated with nausea and vomiting especially after meal. Also some other disorder such as diskynesia or polyps in gallbladder can cause the same. It is very often diagnosis and you shouldnt be worried at all. If your symptoms persists u should do repeated US tests and when diagnosis is confirmed then the surgical procedure, cholecystectomy needs to be done. Today it is done laparoscopicaly so recovery is fast and complications minimal. If you feel pain under the right rib arch associated with fever and vomiting or you notice jaundice and dark urine you should go to ER as soon as possible. WIsh you good health, Dr. Ivan Romich