Objectives: The rationale of Ultrasound in Aesthetics, Dermatology and Plastic surgery

Introduction: The field of aesthetic medicine is constantly growing and attracting always more practitioners all over the world. with the increase of the number of procedures, the side effects are always more frequent. Although the practitioners are very prepared and have a good knowledge of Anatomy, Injecting in major vessels and having vascular compromise is still possible because of Anatomical variation in every unique patient. Also when a patient comes to our practice, we never know what type of dermal fillers exactly have been injected in the past, permanent or resolvable ones.

Conclusion: The occurrence of ‘retrograde flow along the cannula/needle tract’ during filler injections has not been extensively addressed. The retrograde flow phenomenon can be described as follows: as the cannula creates a tract in the tissue, filler can spread within this potential space. This is because filler material tends to spread towards areas of least resistance. According to rheology, the extent of flow depends on the filler's cohesivity and the applied compression force. Conclusion: In conclusion, the retrograde phenomenon is a unidirectional lateral dispersion of filler material along cannula

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