Doctors remove 3.1‑kg bladder stone, possibly world’s largest

A massive bladder stone weighing roughly the same as a full‑term newborn—approximately 3.5 kilograms (7.7 pounds)—has been identified as the largest of its kind ever recorded. The stone was discovered during a routine examination at a regional hospital, prompting immediate surgical intervention to relieve the patient’s severe urinary obstruction and associated pain.

Surgeons performed an open cystolithotomy to extract the stone, noting its unusual size and composition. Medical staff reported that typical bladder stones range from a few grams to a few hundred grams, making this specimen an extreme outlier. Pathology analysis is underway to determine the stone’s mineral makeup and potential contributing factors, such as chronic infection, metabolic disorders, or dietary influences. The case has been documented for inclusion in urological research databases, and physicians anticipate that the findings may inform future prevention and treatment strategies for rare, large‑scale calculi.

The successful removal of the record‑breaking bladder stone underscores the importance of early detection and comprehensive care for patients with urinary tract symptoms. Health officials plan to disseminate the case details to raise awareness among clinicians and to encourage further study of the underlying causes that can lead to such extraordinary stone formation.