The present study aimed to describe the techniques that were used, and the results obtained, with the reverse Yu flap to reconstruct medium-sized upper lip defects following resection for adenoid cystic carcinoma (ACC). Data concerning the clinical and pathological characteristics of tumours, the size and location of the defects, surgical resection and the reconstructive procedure used were evaluated in three patients, as well as postoperative complications and outcomes. In all cases, a complete surgical removal of ACC was achieved with clear margins of at least 1 cm. Histopathological features revealed two cases with a predominant solid growth pattern, and one case of cribriform. Following tumour excision, the average size of the upper lip defect was 35.7×30 mm. The reverse Yu flap was raised simultaneously with tumour resection in all cases. No flap failed, and both excellent aesthetic and functional results were obtained. All the patients had a satisfactory oral competence, without microstomia, after a median of 20 months follow-up (range, 12-30 months). Adjuvant radiation therapy was not necessary in any case. On the basis of the present case study and literature review, reverse Yu flap is revealed to be a simple and reliable technique for the reconstruction of defects ranging from one-third to two-thirds of the total upper lip length, involving the commissure, nasolabial fold and philtrum, with minimal donor morbidity and a good functional and aesthetic outcome. This flap appears to be a valid surgical option for reconstruction of medium-sized upper lip defects, which may be considered following radical excision of ACC.
Keywords: Yu flap; adenoid cystic carcinoma; combined rotation and advancement flap; lip reconstruction; upper lip.