Göran WettrellLund University, Sweden Clarence Crafoord Clarence Crafoord (1899–1984) was one of the most outstanding surgeons in Sweden during the twentieth century (Figure 1). He started his surgical training in the early 1920s. Postoperative complications such as obstructing pulmonary thrombosis were a frequent cause of death. In 1927, Crafoord performed two successful acute pulmonary embolectomies.1…