Gallbladder hydrops, otherwise known as gallbladder mucocele, is an uncommon gallbladder condition characterised by gallbladder distention and accumulation of clear mucous-like inspissated bile. Patients with gallbladder hydrops are usually asymptomatic and incidentally diagnosed on cross-sectional imaging or diagnostic laparoscopy. This case report presents a rare case of calculous gallbladder hydrops measuring 217mm in maximal length in a 56-year-old female presenting with atypical abdominal and urinary symptoms. The radiological and intraoperative images will also be presented to highlight the extensiveness of the disease and therefore the importance of considering gallbladder hydrops as a differential in these patients.