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Research Letter |

Clinical and Dermoscopic Features of Cutaneous Melanoacanthoma

Esther Chung, BA1; Ashfaq A. Marghoob, MD1; Cristina Carrera, MD, PhD1; Michael A. Marchetti, MD1
[+] Author Affiliations
1Dermatology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
JAMA Dermatol. 2015;151(10):1129-1130. doi:10.1001/jamadermatol.2015.1453.
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This review of previously acquired data reports that the use of a 2-step algorithm and pattern analysis in dermoscopy can identify benign cutaneous melanoacanthoma in patients with seborrheic keratosis.

Cutaneous melanoacanthoma (CM) is traditionally considered to be a heavily pigmented variant of seborrheic keratosis (SK).1 The characteristic histologic feature of CM is the presence of large, highly dendritic, melanin-rich melanocytes spread throughout an acanthotic epidermis.2 Owing to their pigmentation, CMs may mimic the clinical appearance of melanoma.1 Although the dermoscopic features of SK are well defined, little is known about the dermoscopic features of CM.3,4 Our objective was to evaluate the clinical and dermoscopic features of CM.

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Figure 1.
Cutaneous Melanoacanthoma on Scalp

A, Clinical image reveals an irregular plaque. B, Milialike cysts, comedolike openings, hairpin vessels with a white halo, a blue-white veil, hemorrhagic crusts, and erosions are visualized with dermoscopy.

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Figure 2.
Cutaneous Melanoacanthoma on Neck

A, Clinical image reveals a pigmented plaque. B, Ridges and/or fissures, milialike cysts, comedolike openings, sharp demarcation, and a subtle blue-white veil are visualized with nonpolarized dermoscopy. C, A polarized dermoscopic image shows more conspicuous comedolike openings, milialike cysts, and blue color.

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