Toddler with a whooping-sounding cough Pediatric Imaging Chest November 10, 2025September 18, 2025 CXR AP shows bilateral lung hyperexpansion with bilateral perihilar infiltrates that blur the border of the heart, resulting in the heart border having a shaggy appearance. The diagnosis was pertussis pneumonia. Related Published November 10, 2025September 18, 2025