Also known as: Giant aneurysm with heart defect
Katy is a doomsday prepper who presents with a massive aortic aneurysm caused by a congenital complete vascular ring defect. She requires two surgeries: first to repair the aneurysm (which ruptures intraoperatively), and second to correct the underlying congenital defect. The surgery becomes the vehicle for Dr. Thomas's final case and collapse.
Also known as: Trampled
Melissa is a cyclist crushed by a car after a tire blowout. Meredith performs field resuscitation and then multiple surgeries to repair extensive injuries including liver damage, pneumothorax, and vascular injuries. The case parallels Lexie's death and tests Meredith's emotional state as she fights to save a young woman with similar injuries to her sister.
Also known as: Connection between stomach and heart sac with air
A rare case of gastropericardial fistula with pneumopericardium that Parker offers to Cristina, which she turns down in favor of working with Dr. Thomas on the aneurysm repair.
Also known as: V-fib
Dr. Thomas collapses with ventricular fibrillation in the middle of surgery while repairing Katy's vascular ring. The team attempts resuscitation with defibrillation and CPR, but he dies, marking a pivotal and emotional moment for Cristina and the hospital.