The surgery began at nine in the morning and continued late into the night. Brain surgery is slow and dangerous, and removing a tumor can be like defusing a bomb. Often, surgeons look through a microscope and use long-handled, fine-tipped instruments to pull the tumor away from the brain before removing it with a sucker. A quarter of the body’s blood courses through the veins and arteries of the brain; if one of them is torn, bleeding and stroke can result. It’s also possible to remove important parts of the brain by accident, because brain tissue and tumor tissue look pretty much the same. Unlike the rest of the body, the brain and the spinal cord rarely heal. If a neurosurgeon makes a mistake, the damage is often permanent.
By midnight, Henry Marsh and his team had removed almost all of the tumor. The atmosphere in the operating theatre was relaxed and celebratory; the surgical team paused for cigarette breaks and listened to Abba and Bach. “I should have stopped at that point, and left the last piece of tumor behind,” Marsh writes in his memoir, “Do No Harm” (Thomas Dunne). Instead, he ventured further—he wanted to be able to say that he had taken it all out. “As I started to remove the last part of the tumor,” Marsh writes, “I tore a small perforating branch off the basilar artery, a vessel the width of a thick pin. A narrow jet of bright red arterial blood started to pump upwards.” The basilar artery carries blood to the brain stem, which regulates the rest of the brain. Marsh quickly stopped the bleeding, but the oxygen deprivation was enough to irreparably damage the man’s brain stem, and he never regained consciousness.
By midnight, Henry Marsh and his team had removed almost all of the tumor. The atmosphere in the operating theatre was relaxed and celebratory; the surgical team paused for cigarette breaks and listened to Abba and Bach. “I should have stopped at that point, and left the last piece of tumor behind,” Marsh writes in his memoir, “Do No Harm” (Thomas Dunne). Instead, he ventured further—he wanted to be able to say that he had taken it all out. “As I started to remove the last part of the tumor,” Marsh writes, “I tore a small perforating branch off the basilar artery, a vessel the width of a thick pin. A narrow jet of bright red arterial blood started to pump upwards.” The basilar artery carries blood to the brain stem, which regulates the rest of the brain. Marsh quickly stopped the bleeding, but the oxygen deprivation was enough to irreparably damage the man’s brain stem, and he never regained consciousness.








