Congenital microcystic adnexal carcinoma

Periocular Microcystic Adnexal Carcinoma: A Case Report and a Major Review

PURPOSE

To describe a patient with periocular microcystic adnexal carcinoma (MAC) and to review the clinical presentation, systemic work-up, histopathologic features, and outcome of all previously reported periocular MAC.

METHODS

A major literature review. PubMed/MEDLINE and Google Scholar databases were searched for all well-documented cases of periocular MAC.

RESULTS

The final analysis yielded 93 patients with MAC, 48 (52%) females, 39 (42%) males, and 6 with sex not specified (6%) with an average age of 56 years (range 3 days-95 years). Most tumors were localized to the eyebrow (26/93, 28%) and lower eyelid (20/93, 22%). Of patients with known information, MAC most commonly presented as a nodule (37/68, 54%) or plaque (20/68, 29%) with poorly-defined margins (20/51, 39%) and distortion of eyelid margin (13/51, 25%). Orbital involvement at any point of the disease course was seen in 20 of 93 (22%) patients. An accurate histopathologic diagnosis on initial biopsy was made in 25 of 70 (36%) cases. Initial management included surgical excision (47/93, 51%), Mohs micrographic surgery (17/93, 18%), and excision with frozen section control of margins (8/93, 9%). Aggressive or recurrent MAC was managed with multimodal therapies, including adjuvant radiation (10/34, 29%). The average follow-up after the last treatment was 3 years (median 2, range 0.2-20 years). In total, 33 of 86 (38%) tumors recurred, and 6 of 87 (7%) metastasized. Disease-related mortality occurred in 3 of 79 (4%) of patients.

CONCLUSIONS

Periocular MAC is frequently misdiagnosed on initial biopsy and has a tendency for recurrence and locally aggressive behavior, highlighting the importance of accurate timely diagnosis, and appropriate management.

Current Diagnosis and Treatment Options for Cutaneous Adnexal Neoplasms with Apocrine and Eccrine Differentiation

Adnexal tumors of the skin are a rare group of benign and malignant neoplasms that exhibit morphological differentiation toward one or more of the adnexal epithelium types present in normal skin. Tumors deriving from apocrine or eccrine glands are highly heterogeneous and represent various histological entities. Macroscopic and dermatoscopic features of these tumors are unspecific; therefore, a specialized pathological examination is required to correctly diagnose patients. Limited treatment guidelines of adnexal tumor cases are available; thus, therapy is still challenging. Patients should be referred to high-volume skin cancer centers to receive an appropriate multidisciplinary treatment, affecting their outcome. The purpose of this review is to summarize currently available data on pathogenesis, diagnosis, and treatment approach for apocrine and eccrine tumors.

Microcystic Adnexal Carcinoma and a Summary of Other Rare Malignant Adnexal Tumours

OPINION STATEMENT

Microcystic adnexal carcinoma (MAC) is a rare, slow-growing, infiltrative malignant tumour most commonly found on the head and neck. It often presents as a solitary skin-coloured or yellow papule, plaque or nodule. Ultraviolet radiation, immunosuppression and ionising radiation are possible risk factors. Clinical and histological differential diagnoses include morpheaform basal cell carcinoma and desmoplastic trichoepithelioma. The diagnosis is usually made by skin biopsy, and the characteristic features are small keratin-filled cysts with nests and cords which resemble ductal structures. Immunohistochemistry can assist in differentiating MAC from other tumours. The local aggressive nature of the tumour and its potential to infiltrate beyond the assessed clinical margins warrant complete excision with marginal control, and we recommend Mohs micrographic surgery. Wide local excision is widely performed but is associated with recurrence given its infiltrative nature and extensive subclinical extension. The role of radiotherapy in the management of MAC is unclear.

Microcystic adnexal carcinoma in the axilla of an 18-year-old woman

Microcystic adnexal carcinoma (MAC) is an uncommon adnexal neoplasm with a predilection for the head and neck. The tumor rarely metastasizes but is locally aggressive and commonly demonstrates perineural invasion. MAC occurs most often in older adults. This report describes a young woman with a MAC in her left axilla who required two stages of Mohs micrographic surgery followed by a wide local excision because of persistent perineural invasion in close proximity to the brachial plexus. Other cases presenting in the pediatric age group are discussed.