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Patient positioning for the examination, anatomical references, and evaluated regions. A: Horizontal supine position. B: Left lateral position. PSL, parasternal line; AAL, anterior axillary line; PAL, posterior axillary line. 1, anterosuperior region; 2, anteroinferior region; 3, upper lateral region; 4, lower lateral region; 5, posterosuperior region; 6, posteroinferior region.
