Immunohistochemistry-Assisted Mohs Surgery for Invasive Eyelid and Periorbital Cutaneous Melanoma.

Background: Prior studies describe wide local excision and "slow Mohs" outcomes for periocular melanoma. Mohs micrographic surgery (MMS) with immunohistochemistry maximizes tissue preservation and offers same-day comprehensive margin evaluation, which facilitates expedited repair, and coordination of oculoplastic reconstruction when necessary.

Objective: To describe oncologic and reconstructive outcomes of invasive periocular cutaneous melanoma treated with immunohistochemistry-assisted MMS.

Materials and methods: Invasive melanoma cases affecting the eyelids or periorbital region treated with MMS between 2008 and 2018 were reviewed. Eyelid tumors and those in adjacent subunits were compared. Main outcome measures were recurrence, melanoma-specific death, and postreconstructive complications.

Results: Of 42 cases, 28 were classified as periorbital and 14 as eyelid involving. Most were T1 (37, 88.1%). There was 1 local recurrence in a patient with persistent positive conjunctival margin (2.4%). No local recurrences were observed in cases where negative Mohs margins were achieved, and no melanoma-related deaths occurred. Eyelid tumors were more likely to result in lid margin involving defects and require oculoplastic reconstruction. Eyelid complications developed in 10 cases (23.8%), and 5 (11.9%) required revision surgery.

Conclusion: Mohs micrographic surgery for periocular melanoma results in low rates of local recurrence and melanoma-specific death. Initial tumor location can aid in reconstructive planning.