Novice sonographers can predict a positive I&D with SN 0.97 and SP 0.67 (vs clinical exam 0.76 and 0.83)
Gas gangrene






Abscess
Gas gangrene
Abscess
Hematoma






Hematoma
Hematoma
Hematoma
Fluid collect seen has heteroechoic or hypoechoic circular area
Hyperechoic ring
Posterior acoustic enhancement
Swirling or Squish Sign (movement of abscess debris) with compression
Irregular borders
Color flow may be used to differentiate vascular and lymphatic structures
In the inguinal crease strangulated bowel can mimic abscess
The collection seen under U/S may not correspond with actual collection size
Hematomas can look similar to abscess, so the right clinical context is needed
Ultrasound: Soft tissue
Ultrasound: Signs
Ultrasound: Bone
Ultrasound: Pharyngeal
Ultrasound: Tendons
Ultrasound: Lungs
Ultrasound: Joint
Ultrasound: Pelvic