The POCUS Kingdom
Ultrasonography is a visual discipline and metaphors relating to familiar analogous items such as animals make recognition of normal and abnormal images easier. They also serve as teaching aids, enhancing memory retention of the learners. Some authors use the term “ultrasound pareidolia” to describe this concept. The ‘POCUS Kingdom’ section is dedicated to such interesting comparisons.
Kidney and Bladder
Another Dromedary hump 
Twin kidney appearance: perinephric hematoma 
ACKD = acquired cystic kidney disease 
Kidney on Fire appearance: Normal Power Doppler
Other abdominal organs
Another Portal triad 
Gall bladder and portal vein appearing like an exclamation mark! 
Another example of Banana peel 
Another example looking more like a goat head 
Liver and IVC long axis appearing like a fish head or snake head 
IVC ‘smoke’ seen in heart failure due to stasis/rouleaux formation (also seen in healthy thin individuals when using high-resolution US machines)
Heart
“Swinging heart” in pericardial effusion: echo equivalent of electrical alternans 
Arrows point to pulmonary veins 
Subcostal bicaval view appearing like a snail
Lung
Another whale tail + spine sign 
Rt. pleural effusion from subxiphoid view: Dinosaur head sign (effusion = mouth, collapsed lung = tongue, IVC = eye, liver = face) 
Curtain sign: Normally aerated supradiaphragmatic lung (A-lines) moving over the diaphragm and liver/spleen. Usually lost in pleural effusion/basal consolidation.
Vascular and others
Police siren sign: alternating red-blue pattern (only D-wave below the baseline) indicating severe hepatic vein congestion