What is the diagnosis based on the given HIDA-scan?

IOC for diagnosis of acute cholecystitis - USG HIDA scan is the gold standard investigation for diagnosis of acute cholecystitis (Hepatobiliary Imino Diacetic Acid scan) Whenever radio-nucleoid agent is given by I.V route; It is going to be taken by phagocytic cells of the liver (Kupffer cells) & are excreted into Bile and follow the pathway which bile is going to flow. The diagram given is HIDA scan in which gall bladder is not visualized means, it is diagnostic of Acute cholecystitis (because temporary obstruction of cystic duct is the initiating event of cholecystitis).