Book excerpt: A 35-year-old woman arrives on the labour ward complaining of abdominal pain and vaginal bleeding at 36 weeks 2 days' gestation. The pain started 2 hours earlier while she was in a cafe and is not relieved by lying still or walking around. The bleeding is bright red. You are the medic on duty... 100 Cases in Obstetrics and Gynaecology presents 100 obstetric- or gynaecology-related scenarios commonly seen by medical students and junior doctors in the emergency department, outpatient clinic, or on the ward. A succinct summary of the patient's history, examination, and initial investigations—including photographs where relevant—is followed by questions on the diagnosis and management of each case. The answer includes a detailed discussion on each topic, with further illustration where appropriate, providing an essential revision aid as well as a practical guide for students and junior doctors. Making speedy and appropriate clinical decisions, and choosing the best course of action to take as a result, is one of the most important and challenging parts of training to become a doctor. These true-to-life cases will teach students and junior doctors to recognize important obstetric and gynaecological conditions, and to develop their diagnostic and management skills.