Dr. Carole Dennie, a professor of radiology at the University of Ottawa, discusses observational skills related to chest radiographs in a presentation titled "CXR: Lines, Stripes and Interfaces." Emphasizing the enduring importance of conventional radiography in investigating thoracic diseases, she focuses on recognizing normal and abnormal lines, stripes, and interfaces on chest radiographs. Dr. Dennie covers various structures, such as the anterior and posterior junction lines, paratracheal stripes, aortopulmonary window, and more. She highlights the significance of identifying abnormalities in these structures to guide further imaging and formulate a concise differential diagnosis. The talk underscores the need for a systematic approach to analyze chest x-rays and interpreting observed lines and interfaces accurately.