A healthy 42-year-old woman walked into the emergency department with a serious chest problem. Her internal thoracic artery had developed a weak spot and burst. This type of artery runs along the chest wall and supplies blood to the breast and chest muscles. When it ruptures, it can cause severe bleeding into the chest cavity. This condition is rare but dangerous because it can look like a simple fluid buildup. Doctors often miss it at first glance.
The medical team acted quickly to save her life. They performed an emergent transcatheter arterial embolization. This procedure uses tiny coils to plug the leaky artery and stop the bleeding. They also placed a chest tube under ultrasound guidance to drain the fluid. These steps achieved definitive hemostasis, which means they completely stopped the bleeding.
The patient recovered uneventfully and was discharged without complications. No adverse events or serious side effects were reported during her stay. This case report highlights a critical diagnostic pitfall in emergency medicine. It shows how a ruptured internal thoracy artery aneurysm can masquerade as a simple pleural effusion. The story underscores the pivotal role of computed tomography angiography and endovascular therapy in optimizing outcomes for these rare but critical conditions.