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Abscess. The patient presented with painful swelling of right cheek after hyaluronic acid injection 2 months earlier. Axial (A) and coronal (B) T2, axial T1 (C), and coronal fat-saturated postcontrast T1 (D) MR images show deposits of hyaluronic acid in the bilateral oral commissures and upper lip (arrowheads). Posterior to the filler on the right, there is a multiloculated rim-enhancing fluid collection (arrows).
