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#POCUS appearance of pneumoperitoneum (thread) - appreciate how normally abdominal wall, peritoneal line and intraperitoneal structures can be appreciated 
Pneumoperitoneum causes peritoneal line to be enhanced, and gas scatter beneath means intraperitoneal structures can't be seen. Instead, reverberation artefacts from peritoneal line - similar to pleural A-lines - can be seen.
#POCUS at borderzone of pneumoperitoneum can show "peritoneal point" (cf. lung point in pneumothorax)
On compression, free gas in peritoneal cavity can displaced, revealing intraperitoneal structures - "Curtain Sign"
Turn the patient to left side, pneumoperitoneum will rise and be seen caudal to pleural line - and instead of liver, you will see EPSS and A-line pattern
Same finding using phased array probe - but if doubtful, reduce depth/use high frequency probe to distinguish pleural line from EPSS - as shown in previous tweet
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