The image is a page from a book or document, specifically focusing on "3. Trường hợp xác định." This section appears to be discussing medical or diagnostic procedures. The text is written in Vietnamese and includes several bullet points, each detailing different aspects of the procedure. The text is organized into numbered points, with each point containing more detailed information. The background of the page is white, and there are some images and diagrams accompanying the text. The overall layout suggests that this page is part of a larger document, possibly a textbook or instructional manual.