Extraocular Sebaceous Carcinoma Treated With Mohs Micrographic Surgery-A 24-Year Retrospective Review of Tumor Characteristics and Treatment Outcomes.

Background: Extraocular sebaceous carcinoma (SC) is rare, with distinct features from its ocular counterpart. These neoplasms have been associated with Muir-Torre syndrome (MTS). Associated internal malignancies include gastrointestinal and genitourinary.

Objective: Assess for local recurrence, metastasis, disease-specific death, and additional malignancies in patients with extraocular SC treated with Mohs micrographic surgery (MMS) at a single referral center.

Methods: Review of patients with extraocular SC treated with MMS between 1995 and 2019. Follow-up was obtained by chart review.

Results: Thirty-eight patients with 41 tumors were identified (25, 66% male). During a mean follow-up of 5.9 ± 5 years, one case of metastasis was identified in an incompletely treated case. No recurrence was identified in the remaining 40 tumors. Five of 41 (12%) tumors had aggressive histologic features. Seven of 38 (18%) patients had a diagnosis of MTS or associated risk factors. There was no association between MTS or its risk factors and high-risk tumors.

Conclusion: There were no incidences of local recurrence, metastasis, or disease-specific death in cases treated completely with MMS. Metastasis and disease-specific death occurred in an incompletely treated case, highlighting the risk associated with aggressive tumors.