RESUMO
BACKGROUND: Lips are considered a key element of facial attractiveness due to their central position in the face and their elemental role in verbal and nonverbal communication. OBJECTIVES: The authors sought to provide clinically relevant information on the 3-dimensional pathway of the superior and inferior labial arteries within the lips to increase safety during labial soft tissue filler injections. METHODS: The study enrolled 41 healthy volunteers with a mean age of 26.17â ±â 9.6 years and a mean body mass index of 23.09â ±â 2.3 kg/m2. Ultrasound imaging was performed at 6 different locations. The position of the labial arteries within the lips, depth of the arteries, cranio-caudal location of each artery in relation to the vermilion border, and diameter of the superior/inferior labial arteries were recorded. RESULTS: The most frequent location of both the superior and inferior labial arteries was the submucosal plane (58.5%) followed by intramuscular (36.2%) and subcutaneous (5.3%) planes. The depth of the superior labial artery in the upper lip was 5.6â ±â 0.13 mm, whereas the depth of the inferior labial artery in the lower lip was 5.2â ±â 0.14 mm. Both arteries were more frequently located within the red lip: upper lip (83% vs 18.7%) and lower lip (86.2% vs 13.8%). In the midline, the artery coursed within the red lip in all investigated volunteers. CONCLUSIONS: Clinically, results of this study favor a superficial injection plane for lip volumization procedures. A perpendicular approach to the lip (coming from the cutaneous lip) might increase safety because the artery is located most frequently within the red lip.