In elderly patients, numerous factors subsidize the diagnostic challenge and high incidence of complications in this specific population, taking gangrenous cholecystitis as a critical example. The aim of this work is to report an unusual case of gangrenous choleystitis in an elderly diabetic women and its atypical clinical presentation. A 79-year-old female patient came to our observation; her medical history showed nausea and vomiting of about 2 hours which rapidly ended with symptomatic therapy, without recurrence, and a 3-week history of intermittent fever associated with productive cough. No abdominal discomfort was declared. Physical examination of the abdomen was negative. Laboratory analysis revealed leukocytosis with the remaining criteria within the normal range. After 2 days, she started with a mildabdominal pain in the epigastric region that rapidly progressed to the right upper quadrant, right flank and right iliac fossa, without nausea, vomiting or fever. Abdominal computer tomography findings revealed thickness of the gall-bladder and important densification of the vascular bed. Acute cholecystitis was diagnosed. The patient was then submitted to a laparoscopic cholecystectomy under general anaesthesia with findings suggestive of gangrenous acute cholecystitis confirmed by histologic examination of the specimen. Delays in diagnosing acute cholecystitis in specific populations, such as elderly diabetics, result in a higher prevalence of morbidity and mortality due to potentially serious complications as gangrenous cholecystitis. Consequently, the diagnosis should be measured and investigated promptly in order to prevent poor outcomes.