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Primary Cutaneous Adenoid Cystic Carcinoma: a Case Report and Review of the Literature

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Primary Cutaneous Adenoid Cystic Carcinoma: a Case Report and Review of the Literature Primary Cutaneous Adenoid Cystic Carcinoma: A Case Report and Review of the Literature Jennifer Barnes, MD; Carlos Garcia, MD Primary cutaneous adenoid cystic carcinoma is x-ray were normal. Serum carcinoembryonic antigen a rare cancer, with only 61 cases reported in levels were within reference range. The lesion was the literature. We report an additional case and treated with Mohs micrographic surgery and tumor- review the latest recommendations for workup free margins were achieved in 2 stages. The defect and treatment. was repaired with a rotation flap. The patient was Cutis. 2008;81:243-246. recurrence free at 6-month follow-up. Comment Adenoid cystic carcinoma can arise from a vari- Case Report ety of primary sites, including the salivary glands, A 62-year-old woman presented to her dermatolo- respiratory tract, cervix, vulva, breast, thymus, gist with several months’ history of a painless nodule prostate, external auditory canal, esophagus, and on the scalp. The patient had a prior medical his- skin.1,2 Adenoid cystic carcinoma most commonly tory of hypertension and osteoporosis. Results of a presents in the major and minor salivary glands, physical examination revealed a hard, 20311-mm, so primary adenoid cystic carcinoma of the major pink and flesh-colored lesion in the mid- and minor salivary glands must be ruled out. In line parietal region of the scalp with alopecia general, adenoid cystic carcinoma can have late- over the nodule (Figure 1). Results of a shave occurring metastasis, involving regional nodes, biopsy stained with hematoxylin and eosin was lungs, bone, and brain, but cutaneous metastasis diagnostic of primary cutaneous adenoid cystic from a primary head and neck adenoid cystic car- carcinoma (Figure 2). Mitotic figures were not read- cinoma is exceedingly rare, with only 3 recorded ily identified. The lesion demonstrated perineural cases.3-5 Primary cutaneous adenoid cystic car- invasion and did not invade the epidermis. The cinoma has been reported to metastasize most tumor cells were strongly and diffusely reactive with commonly to the lungs and pleura and also has CD117 (c-kit) in a cytoplasmic pattern with mem- metastasized to lymph nodes.6 branous accentuation. Clinically, primary cutaneous adenoid cystic Age-appropriate cancer screening tests were per- carcinoma usually is a chronic and asymptomatic formed. Results of a breast examination; mam- flesh-colored nodule. It also has been described mogram; otorhinolaryngological examination; and as a furuncle and as a lobulated, purple and red computed tomographic (CT) scans of the head and nodule that may ulcerate. The average diameter neck, as well as the chest and abdomen, did not of the clinical lesion is 3.8 cm. Primary cutane- reveal internal malignancy. Findings from a chest ous adenoid cystic carcinoma presents most com- monly in elderly and middle-aged patients, and the average age at diagnosis is 56 years. Males Accepted for publication August 3, 2007. and females are equally affected, though there From the University of Oklahoma College of Medicine, is a slight predilection for females (54%).7,8 The Oklahoma City. scalp is the most common location, followed The authors report no conflict of interest. Correspondence: Carlos Garcia, MD, Department of Dermatology by the chest, but primary cutaneous adenoid at OUHSC, 619 NE 13th St, Oklahoma City, OK 73104 cystic carcinoma has been described on many ([email protected]). locations, including the scrotum and eyelid.9,10 VOLUME 81, MARCH 2008 243 Cutaneous Adenoid Cystic Carcinoma Figure 1. Pink and flesh-colored lesion (20311 mm) in the mid- line parietal region of the scalp with alopecia over the nodule. The clinical course is commonly complicated by upon in the literature. Lack of continuity with local recurrence. epidermis, immunohistochemical staining, and Histologically, infiltrative growth extending histologic appearance of tubular and cribriform deep into the dermis and subcutaneous tissue and structures favor an eccrine origin.13 However, prominent perineural invasion are the character- the tumor cells contain cytoplasmic microfila- istic features of the tumor. Tumor cells are classi- ments in parallel bundles, making myoepithelial cally arranged in tubular and cribriform patterns origin possible.2 of the reticular dermis with a basaloid appear- The differential diagnosis of primary cutaneous ance, never extending to the epidermis. Adenoid adenoid cystic carcinoma includes adenoid basal cystic carcinoma follows a sequential transition cell carcinoma and mucinous carcinoma. Basal cell of its architectural pattern from tubular to crib- carcinoma may show a cribriform growth pattern riform to solid. A tubular pattern has the best with lumina formation, cystic degeneration, scant prognosis and represents the best differentiation. cytoplasm, and hyaluronic acid mucin, mimick- However, the solid pattern is the least differen- ing primary cutaneous adenoid cystic carcinoma, tiated with the worst prognosis. The cribriform but primary cutaneous adenoid cystic carcinoma pattern appears to lie between the tubular and lacks the peripheral palisading nests of tumor cells solid patterns, both histologically and clinically.11 and the elongated basaloid cell shape of basal cell Staining reveals eosinophilic hyaline material carcinomas. Also, basal cell carcinoma tumor cells that is hyaluronidase sensitive and positive for connect with the epidermis and lack perineural periodic acid-Schiff and Alcian blue stains at invasion, which is a characteristic finding in pH 2.5. These findings are consistent with the primary cutaneous adenoid cystic carcinoma.12,14 presence of hyaluronic acid.12 Perineural inva- Differentiating primary cutaneous adenoid cystic sion is a histologic characteristic as well as a carcinoma from mucinous carcinoma is easily predictor of aggressive clinical behavior. resolved using histochemistry; primary cutaneous The cell of origin of adenoid cystic carci- adenoid cystic carcinoma stains hyaluronic acid noma has been hypothesized to be eccrine gland, palely, while mucinous carcinoma stains densely myoepithelial cell, and undifferentiated duct because of sialomucins.12 cell,2,13 but the exact origin of primary cutaneous Prior literature of primary cutaneous adenoid adenoid cystic carcinoma has not been agreed cystic carcinoma failed to discuss a thorough 244 CUTIS® Cutaneous Adenoid Cystic Carcinoma literature, none of the lesions recurred, but the recorded tumor-free intervals ranging from 6 to 28 months do not allow sufficient time for recur- rence.15,16 The average size of tumors treated with Mohs micrographic surgery is 2.1 cm, smaller than the average recorded lesion. Primary cutaneous adenoid cystic carcinoma contains large amounts of hyaluronic acid, so toluidine blue stain is useful in revealing the tumor during treatment.16 Although rare, lymph nodes may be involved by direct extension. There have been 3 reported cases of lymph node metastasis17-19 and some authors have suggested regional lymph node dis- Figure 2. Multiple ductal structures embedded in a section as a reasonable option for larger primary focally dense sclerotic stroma. The ducts are lined by lesions.17,18 Irradiation may be used in conjunc- fairly monomorphous cuboidal cells with moderate tion with surgery, especially if there is doubt of amounts of eosinophilic cytoplasm and round to ovoid complete excision or if the lesion is extensive.20,21 nuclei with fine chromatin and small inconspicuous nucle- Chemotherapy was implemented in cases with oli. Some of the ducts show cribriform architecture and distant metastases.18,22 Follow-up for primary contain luminal mucin (H&E, original magnification 34). cutaneous adenoid cystic carcinoma necessitates regular chest x-rays, as 8% of patients develop diagnostic workup for a patient with the dis- pulmonary metastases as late as 18 years after ease, resulting in confusion of primary origin the excision of the primary lesion.6 Because of and missed metastatic lesions. The workup for a its indolent nature and long tumor-free intervals, patient diagnosed with primary cutaneous adenoid long-term close clinical follow-up for patients cystic carcinoma includes a breast examination; with primary cutaneous adenoid cystic carci- otorhinolaryngological examination; CT scans noma is necessary. of the head and neck, as well as the chest and abdomen; and chest x-ray. Although metastasis REFERENCES of adenoid cystic carcinoma to the skin is rare, 1. Barnhill RL. Textbook of Dermatopathology. Vol 1. 2nd ed. an otorhinolaryngologist would best be able to St. Louis, MO: McGraw-Hill; 1998. eliminate primary salivary gland adenoid cystic 2. Lawrence JB, Mazur MT. Adenoid cystic carcinoma: carcinoma as a diagnosis. Primary salivary gland a comparative pathologic study of tumors in salivary adenoid cystic carcinoma should be strongly gland, breast, lung, and cervix. Hum Pathol. 1982;13: considered if the patient has a history of head 916-924. and neck adenoid cystic carcinoma.3 Although 3. Chang CH, Liao YL, Hong HS. Cutaneous metastasis rare, salivary gland adenoid cystic carcinoma can from adenoid cystic carcinoma of the parotid gland. involve skin by direct extension or metastasis.3,4 Dermatol Surg. 2003;29:775-779. An x-ray and CT scan of the chest will rule out 4. Vinod SU, Gay RM. Adenoid cystic carcinoma of the pulmonary metastasis because it is the most com- minor salivary glands metastatic to the hand. South Med J. mon site for primary cutaneous adenoid cystic 1979;72:1483-1485.
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