Mustardé Cheek Rotation-Advancement Flap: A Case-Based Experience in Reconstruction of a Large Defect of the Lower Eyelid Due to Squamous Cell Carcinoma.

: Restoring the integrity of the lower eyelid presents a complex surgical challenge due to its lamellar structure and the high risk of complications. Among these, ectropion is the most frequent and troublesome outcome. : This study aims to present a case of lower eyelid reconstruction following the excision of squamous cell carcinoma using Mohs micrographic surgery combined with the Mustardé cheek rotation flap technique, highlighting its advantages, limitations, and applicability in elderly patients. : A 93-year-old female patient with right lower eyelid squamous cell carcinoma underwent Mohs micrographic surgery. The resulting defect was reconstructed using a Mustardé cheek rotation flap, chosen for its suitability in patients with adequate skin laxity. Patient-specific risk factors, including advanced age, a history of ischemic stroke, and class II heart failure (NYHA classification), were considered in the surgical planning stage. : The Mustardé cheek rotation flap provided a reliable closure with a favorable esthetic outcome and inconspicuous scarring, aligned with natural anatomical margins. The technique was technically straightforward in this patient owing to age-related skin laxity. No major postoperative complications were observed. : The Mustardé cheek rotation flap represents a safe and effective reconstructive option for elderly patients with lower eyelid defects following tumor excision. This case illustrates the esthetic and functional benefits of the technique while emphasizing the need to tailor reconstruction strategies to patient comorbidities and defect characteristics.