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      Dermoscopic “Landscape Painting Patterns” as a Clue for Labial Melanotic Macules: An Analysis of 80 Cases

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          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Background

          Labial melanotic macules (LMMs) are benign pigmented lesions that usually take the shape of flat asymmetrical macules with tan-brown to black color and variable size. Whereas the dermoscopic features of other pigmented skin lesions have been relatively well described, little is known about LMMs.

          Objective

          To describe the dermoscopic features and find typical and schematic dermoscopic patterns in LMMs.

          Methods

          A retrospective dermoscopic study was conducted on 80 lesions with histopathologically proved LMMs.

          Results

          We described and defined, for the first time to our knowledge, landscape painting patterns found in 65 of 80 melanotic lesions (81.3%), characterized by parallel lines or circle lines, overlapping vessels with background brown pigmentation. The background brown pigmentations were observed in 74 of 80 lesions (92.5%), the parallel lines in 62 (77.5%), the circle lines in 20 (25.0%), and overlapping vessels in 69 (86.3%). The structureless black pigmentations were only presented in 26 of 80 (32.5%).

          Conclusion

          Dermoscopy can be useful for the clinical detection of LMMs, and “Landscape painting patterns” may represent a dermoscopic clue for the diagnosis of these lesions.

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          Most cited references 6

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          Dermoscopy of pigmented lesions of the mucosa and the mucocutaneous junction: results of a multicenter study by the International Dermoscopy Society (IDS).

          To better characterize the dermoscopic patterns of mucosal lesions in relation to the histopathologic characteristics. Retrospective and observational study. Fourteen referral pigmented lesion clinics in 10 countries. A total of 140 pigmented mucosal lesions (126 benign lesions, 11 melanomas, 2 Bowen disease lesions, and 1 metastasis) from 92 females (66%) and 48 males (34%) were collected from October 2007 through November 2008. Scoring the dermoscopic patterns (dots, globules, or clods, circles, lines, or structureless) and colors (brown, black, blue, gray, red, purple, and white) and correlation with the histopathologic characteristics. Based on univariate analysis and 2 diagnostic models, the presence of structureless zones inside the lesions with blue, gray, or white color (the first model) had a 100% sensitivity for melanoma and 92.9% sensitivity for any malignant lesion, and 82.2% and 83.3% specificity for benign lesions in the group with melanoma lesions and the group with malignant lesions, respectively. Based on the colors (blue, gray, or white) only (the second model), the sensitivity for the group with melanoma was 100% and for the group with any malignant lesion was 92.9%, and the specificity was 64.3% and 65.1%, respectively. Patients with malignant lesions were significantly older than patients with benign lesions (mean [SD] ages, 60.1 [22.8] years vs 43.2 [17.3] years, respectively). The combination of blue, gray, or white color with structureless zones are the strongest indicators when differentiating between benign and malignant mucosal lesions in dermoscopy.
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            Dermoscopy of pigmented lesions on mucocutaneous junction and mucous membrane.

             T Saida,  Jian Lin,  M. Takata (2009)
            The dermoscopic features of pigmented lesions on the mucocutaneous junction and mucous membrane are different from those on hairy skin. Differentiation between benign lesions and malignant melanomas of these sites is often difficult. To define the dermoscopic patterns of lesions on the mucocutaneous junction and mucous membrane, and assess the applicability of standard dermoscopic algorithms to these lesions. An unselected consecutive series of 40 lesions on the mucocutaneous junction and mucous membrane was studied. All the lesions were imaged using dermoscopy devices, analysed for dermoscopic patterns and scored with algorithms including the ABCD rule, Menzies method, 7-point checklist, 3-point checklist and the CASH algorithm. Benign pigmented lesions of the mucocutaneous junction and mucous membrane frequently presented a dotted-globular pattern (25%), a homogeneous pattern (25%), a fish scale-like pattern (18.8%) and a hyphal pattern (18.8%), while melanomas of these sites showed a multicomponent pattern (75%) and a homogeneous pattern (25%). The fish scale-like pattern and hyphal pattern were considered to be variants of the ring-like pattern. The sensitivities of the ABCD rule, Menzies method, 7-point checklist, 3-point checklist and CASH algorithm in diagnosing mucosal melanomas were 100%, 100%, 63%, 88% and 100%; and the specificities were 100%, 94%, 100%, 94% and 100%, respectively. The ring-like pattern and its variants (fish scale-like pattern and hyphal pattern) are frequently observed as well as the dotted-globular pattern and homogeneous pattern in mucosal melanotic macules. The algorithms for pigmented lesions on hairy skin also apply to those on the mucocutaneous junction and mucous membrane with high sensitivity and specificity.
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              Dermoscopic features of mucosal melanosis.

              Melanosis (lentiginosis, labial melanotic macula) is a benign pigmented lesion of mucosa characterized by pigmentation of basal keratinocytes with melanocytic normal or slightly increased in number. Melanosis, particularly when occurring on genitalia, can clinically mimic mucosal melanoma thus creating concern in both the patient and the physician. In this study dermoscopic features from a series of clinically equivocal (n=11) or clinically typical (n=10) mucosal melanosis were analyzed. All the women consecutively seen at the Vulva Clinic of the Department of Obstetrics and Gynecology, University of Florence, Italy, from May 1, 2002 to June 30, 2002, were examined. Three major dermoscopic patterns were identified: (1) a "structureless" pattern, predominantly found in clinically equivocal vulvar melanosis, with a blue hue, associated with the presence of melanophages in the upper dermis, present in the majority of these lesions; (2) a "parallel pattern," often found in clinically typical melanotyc macules of the lips and penis; and (3) a "reticular-like" pattern associated with clinically equivocal melanosis occurring at peculiar sites such as the areola (all the three cases occurred at that site) or, rarely, on the lip. Dermoscopy can play a role in the noninvasive classification of mucosal melanosis. The risk of misclassification with melanoma is probably dependent on dermoscopy pattern shown by the lesion. Prospective studies including early melanomas are needed to establish diagnostic performance of dermoscopy in pigmented lesions of the mucosa.
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                Author and article information

                Journal
                Ann Dermatol
                Ann Dermatol
                AD
                Annals of Dermatology
                The Korean Dermatological Association; The Korean Society for Investigative Dermatology
                1013-9087
                2005-3894
                June 2018
                23 April 2018
                : 30
                : 3
                : 331-334
                Affiliations
                [1 ]Department of Dermatology, Pusan National University School of Medicine, Busan, Korea.
                [2 ]Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.
                Author notes
                Corresponding author: Moon-Bum Kim, Department of Dermatology, Pusan National University Hostpital, 179 Gudeok-ro, Seo-gu, Busan 49241, Korea. Tel: 82-51-240-7338, Fax: 82-51-245-9467, drkmp@ 123456hanmail.net
                Article
                10.5021/ad.2018.30.3.331
                5929951
                Copyright © 2018 The Korean Dermatological Association and The Korean Society for Investigative Dermatology

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                Categories
                Original Article

                Dermatology

                dermoscopy, labial melanotic macules, landscape painting patterns

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