Reverb Comets and Rings

• Equally spaced reflection artifact
• A lines – normal finding in lung US

• Dense tapering trail of reverberation artifact
• Metallic elements, calcifications, cholesterol

• Adenomyomatosis
• Benign condition of gallbladder
• Cholesterol deposits in wall

• Dense tapering trail of reverberation artifact
• Metallic elements, calcifications, cholesterol

• Resonance from an air liquid interface
• From air (not calcium, metal, etc.)
• Can appear similar to comet tail
• Confusion in the literature

"B lines"

• Alveolar interstitial syndrome (AIS)
• Air - water -> artifact
• Pulmonary edema, others

• Resonance from an air liquid interface
• From air (not calcium, metal, etc.)

• Pneumobilia
• Air in liver from gas forming organism in sepsis