What is the fine-grained topic of the following text: Ravikumar Veeraswamy, M.D., Director of the Division of Vascular Surgery at the MUSC Health Heart and Vascular Center, discusses thoracic endograft, a minimally invasive approach for repairing a thoracic aortic aneurysm, using surgical footage and imaging to illustrate. Only return the topic.
Discussion on thoracic endograft for repairing thoracic aortic aneurysm by Dr. Ravikumar Veeraswamy