In an unusual case, a surgeon developed a cancerous lump on his hand that stemmed from an injury he sustained while performing surgery.The patient: A 53-year-old man in Germany The symptoms: A surgeon developed swelling in his left hand near the base of his middle finger. This was the site of an injury he sustained five months earlier while removing a patient's malignant abdominal tumor. The lump in the surgeon's hand measured 1.2 inches (3 centimeters) in diameter. What happened next: The surgeon had the lump removed, and an analysis revealed that it was a cancerous fibrous histiocytoma, a type...