In procedural medical and ultrasound, hydrodissection is a technique involving the injection of a fluid, typically saline or a local anesthetic, to separate tissue planes or create a safety margin around a structure. This method enhances visibility, facilitates safe needle advancement during biopsies or injections, and can mitigate nerve injury by isolating neural structures from surrounding tissues or lesions.
Hydrodissection is crucial in various ultrasound-guided interventions, improving procedural accuracy and patient safety. By creating anechoic fluid pockets, sonographers gain clearer views of target anatomy and critical adjacent structures, making delicate procedures like nerve blocks, cyst aspirations, or tumor ablations more precise and less prone to complications.