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Pleural effusion initially identified with transducer in standard cephalo-caudad orientation. Of note, screen orientation was mistakenly reversed from usual bedside sonography convention.
Transducer is rotated 90 degrees, now perpendicular to the long axis of the patient's body. Effusion remains visible as an anechoic, crescentic area surrounding a prominent and heterogenously hyperechoic triangular protrusion representing atelectatic lung (plausible etiology compressive atelectasis given size of effusion)
The still image depicts how one would then calculate interpleural distance in keeping with a Balick formula calculation of pleural effusion volume.