When interpreting frontal chest x-rays, mediastinal lines, stripes, and interfaces can serve as soft markers for an underlying disorder in the medial lung/pleura, mediastinum, or left atrium.

• Suggested CaseStacks.com cases:

• https://www.casestacks.com/chest/radiographs/mediastinum/classic-case8/

• https://www.casestacks.com/chest/radiographs/practice-cases/case19/

• https://www.casestacks.com/chest/radiographs/practice-cases/case26/

• https://www.casestacks.com/chest/radiographs/practice-cases/case44/