Microcystic Adnexal Carcinoma Follow-up
- Author: Nektarios I Lountzis, MD; Chief Editor: Dirk M Elston, MD more...
Further Outpatient Care
The longest latent period for microcystic adnexal carcinoma (MAC) recurrence following simple excision is 30 years. This particular patient underwent a simple excision for adnexal adenoma in 1953. When he presented again 30 years later, the initial slides were reviewed, and a retrospective diagnosis of microcystic adnexal carcinoma was made. This case illustrates the indolent nature of microcystic adnexal carcinoma and supports the view that simple excision may be not adequate and long-term follow-up care is required.
Deterrence/Prevention
Sun avoidance minimizes UV exposure, which may be a predisposing factor.
Complications
Local recurrence is a complication if it is not properly excised. Additionally, because of the deep penetration of the tumor, destruction of underlying tissue (eg, bone, cartilage, muscle) can lead to structural changes and increased morbidity.
Prognosis
Overall, the prognosis is good, especially when margin-control techniques such as Mohs micrographic surgery (MMS) are used, with a modest tendency for recurrence and a very low rate of metastases.
The largest series of cases reports an overall (combining results from simple excision and MMS) 10-year recurrence rate of 18%. Others have reported a 12% recurrence rate at mean follow-up of 39 months.[5]
Although microcystic adnexal carcinoma is considered a nonmetastasizing tumor, rare reports detail histologically confirmed lymphatic spread. Of the more than 300 reported cases of microcystic adnexal carcinoma, only 9 have been metastatic.[6, 7, 8, 9, 10, 11, 12, 13, 14]
Two deaths have been attributed to metastatic microcystic adnexal carcinoma. One patient presented with mediastinal lymphadenopathy and later died of the disease. However, no histologic evidence from the lymph nodes confirmed the cause of death.[12] The other death occurred from a microcystic adnexal carcinoma of the right-upper eyebrow that lead to perineural spread though the orbit with central nervous system dissemination.[11] In another reported case of distant metastatic disease, the patient eventually died of aspiration pneumonia, not from the microcystic adnexal carcinoma itself.[13]
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