This book is for patients with chest deformity who are considering treatment. Patients who are seeking treatment need to find surgeons suited to them. There are various ways to find the best surgeon. Some patients might choose a nearby hospital. However, though the hospital claims that it can treat pectus excavatum, patients would hardly be able to receive excellent treatment, if the hospital treats only five to six pectus excavatum cases in a year. On the other hand, even though a certain surgeon proudly declares that he has treated hundreds of patients, the surgeon may not necessarily provide ideal outcomes for some types of patients. In particular, female patients may find it difficult to find a suitable surgeon. In order to receive optimal and satisfying treatment, patients with pectus excavatum should know more about the disease. They should participate in the decision-making process with their surgeons. Patients should have decent knowledge about pectus excavatum before receiving treatment, so that they can select the most suitable surgeons for them. The author expects this book to contribute to achieving this purpose.