Gallbladder Agenesis Mimicking Chronic Cholecystitis in a Young Woman.

Gallbladder agenesis is a rare anatomic congenital abnormality caused by the cystic bud failing to develop into the gallbladder. Gallbladder agenesis has a variable presentation, with 50% of patients presenting with symptoms mimicking biliary colic and 35% being incidentally discovered during surgery or autopsy, while another 15% can present with fatal fetal anomalies. In this article, we present a case of gallbladder agenesis in a young woman who presented with biliary-colic-like symptoms suggesting cholecystitis. The gallbladder was not well visualized on ultrasonography, simulating chronic cholecystitis due to shrunken or contracted bladder. Further imaging with computed tomography (CT) and magnetic resonance cholangiopancreatography (MRCP) helped in the successful diagnosis of gallbladder agenesis and helped prevent unnecessary surgical intervention. Due to the lack of clinical suspicion diagnosing gallbladder agenesis preoperatively is still rare. Persistent symptoms are often associated with biliary colic pain leading to surgery. Conservative management consists of using antispasmodic medications. MRCP may be required to rule out gallbladder agenesis and avoid unnecessary surgery. Gallbladder agenesis can present with symptoms similar to cholecystitis. If the gallbladder is not visualized well on the ultrasound, an additional radiological examination is required. Clinicians' understanding of the condition helps to accurately diagnose the condition preoperatively using the appropriate investigations, thereby minimizing the operative risk to the patient.