Anatomy: Radiograph of Chest

Image A: A normal chest radiograph. Image B: Q fever pneumonia.
ICD-10 code:
ICD-9 code:	87.3-87.4

Front of thorax, showing surface relations of bones,lungs (purple), pleura (blue), and heart (red outline). The location of best auscultation for each heart valve are labeled with "M", "T", "A", and "P".

First heart sound: caused by atrioventricular valves - Mitral(M) and Tricuspid (T).

Second heart sound caused by semilunar valves -- Aortic(A) and Pulmonary/Pulmonic (P).