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Somenek. Plast Aesthet Res 2022;9:16  https://dx.doi.org/10.20517/2347-9264.2021.84  Page 5 of 10

               Rhombic transposition flap
               One of the most versatile flaps in the periocular area. The principle is shown in Figure 2A. The 60° to 120°
               rhombus can be thought of as two 60° equilateral triangles that are aligned at the bases. All sides are equal in
               length, and the designed flap is equal in size to the defect. After the transfer of the flap, the greatest wound
               closure tension is at the flap donor site . This is important when considering possible distortion of the
                                                 [5]
               surrounding tissues.

               Unipedicle and bipedicle rectangular advancement flap
                                                                                       2
               This versatile flap is appropriate for this area and used for defects as large as 25 cm [Figure 2B]. It can be
               particularly useful for defects in the medial upper and lower eyelids as well as those in the eyebrows. The
               resulting scar can be designed within the natural creases to avoid injury to the natural lid margin.


               V-Y advancement flap
               Tend to be useful for epicanthal folds and scar contractures. Their main function is to increase the length of
               the palpebral fissure.

               Cervicofacial advancement cheek flap
               The cervicofacial rotation advancement is a random-pattern flap that provides an excellent match for lid
               and cheek reconstruction. The incision runs from the superior aspect of the defect superolaterally to the
               preauricular cheek. The incision is then extended crossing under the ear and inferiorly along the lateral
               neck. The arterial supply arises from perforators of the facial and submental arteries. The cervical skin is an
               excellent source of redundant tissue and allows for proper tissue matching compared to a graft.

               Reconstruction of full-thickness lid defects involving margin
               Small defect (up to 25% to 50% of lid length)
               The lids have an inherent ability to stretch, which is why it is usually possible to reconstruct small defects
               that involve 33% or less of the eyelid with direct approximation. This can be accomplished by conversion of
               the defect into a pentagonal defect with the vertical sides covering the height of the tarsal plate. This helps to
               eliminate dog ear deformities and also create a clean tarsal edge, avoiding misalignment or notching.


               The most important suture is the approximation of the tarsus. 6-0 Vicryl suture is used to perfectly align the
               eyelid margin. An alternative to Vicryl can be monocryl or polydiaxonone. The lash line is then
               approximated with a 6-0 Vicryl followed by repair of the orbicularis oculi muscle. Both of these layers are
               crucial to minimize tension to the skin closure and maximize the appearance of the final scar. The skin is
               closed with a 6-0 nonabsorbable suture with nylon or polypropylene the preferred choices.

               If there is some tension noted, particularly for the defects that range from 33% to 50%, a lateral canthotomy
               and cantholysis are performed to gain a few additional millimeters. Taking care to evert the lid margin
               wound edges will prevent a notched appearance to the eyelid when using the method of closure.

               Tenzel semi-circular advancement flap
               Medium defect (50% to 75% of lid length)
               The Tenzel semi-circular advancement flap was originally described by Dr. Tenzel and Stewart  in 1978. It
                                                                                               [6]
               is a very useful technique to repair defects of the eyelid that are full-thickness, ranging from 33%-75% of the
               horizontal length of the lower eyelid and 30%-66% of the upper eyelid. The flap is a very similar concept to
               the Mustarde rotational flap but uses less tissue rearrangement to repair the eyelid lamellae. The benefit of
               this technique is that it is performed in a single-stage operation.
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