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Abstract
Importance Vulvar melanosis is a common pigmentary change that accounts for most pigmented vulvar lesions. It presents as single or multiple asymptomatic macules or patches of varying size and color that may be asymmetric with poorly defined borders. The differential diagnosis of melanocytic lesions includes melanoma, which creates anxiety for patients and the physicians who diagnose the condition and treat the patients. Objective To evaluate the clinical and dermoscopic features of vulvar melanosis and their changes over time. Design, Setting, and Participants In this cohort study, patients with vulvar melanosis were recruited and followed up in the Department of Dermatology, University of Florence, Florence, Italy, between January 1, 1998, and June 30, 2019. Data on patient characteristics and on both the clinical and dermoscopic features of the vulvar lesions were collected. Each lesion was photographed clinically and dermoscopically at initial evaluation and at annual follow-up visits. Main Outcomes and Measures The clinical, dermoscopic, and histopathologic features of vulvar melanosis and their changes over time. Results This cohort study included 129 women (mean age at diagnosis, 46 years [range, 19-83 years]) with vulvar melanosis. A total of 87 patients (67%) with vulvar melanotic lesions were premenopausal, and 84 patients (65%) had received some type of hormone therapy. The most frequent location for vulvar melanosis was the labia minora (55 [43%]), followed by the labia majora (33 [26%]). In 39 of 129 cases (30%), the lesions increased in size and changed color after initial evaluation but ultimately stabilized. No malignant evolution was documented in any patient during a median follow-up of 13 years (range, 5-20 years). Conclusions and Relevance This study suggests that vulvar melanosis was a benign entity, and changes in lesions over time did not signify malignant transformation. An association between hormonal status and vulvar melanosis may be hypothesized.
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[Diagnosis of pigmented lesions of the vulva]. Ann Pathol 2021; 42:79-84. [PMID: 33568264 DOI: 10.1016/j.annpat.2021.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 01/15/2021] [Indexed: 11/15/2022]
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Dermoscopy for venereologists: an update on patterns of tumors, inflammatory and infectious diseases of the genitalia, and tips for differential diagnosis. Int J Dermatol 2020; 60:1211-1218. [PMID: 33448049 DOI: 10.1111/ijd.15333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 10/24/2020] [Accepted: 11/09/2020] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Dermoscopy is an integrative part of clinical dermatologic examination. For clinicians mainly dealing with genital dermatoses and other venereal diseases, the differential diagnosis includes a broad spectrum of neoplastic, inflammatory, and infectious entities. Dermoscopy might have a valuable role to enhance the clinical differential diagnosis and help avoid some biopsies done for diagnostic purposes. Although the dermoscopic patterns of most tumors and inflammatory diseases of the trunk/face have been described, their manifestations on genital areas are less elucidated. We aimed to provide a succinct summary of existing data on dermoscopy of dermatologic diseases on genital areas. METHODS A literature search was performed on PubMed using the terms dermoscopy OR dermatoscopy OR videodermoscopy OR video dermoscopy AND genital. All studies reporting on dermoscopic findings of at least one case of a dermatologic disease on genital areas were included in the review. Unless otherwise indicated, ×10 was the magnification used in the reported studies. The main outcome was to describe the dermoscopic feature of each disease. RESULTS A total of 31 articles were identified and analyzed. They included single case reports and case series. The described entities were categorized into anatomical variants, vascular and lymphatic lesions, tumors, inflammatory disorders, and infectious conditions. CONCLUSION In diseases of the genital area, dermoscopic findings can be highly diagnostic and might establish a confident diagnosis. Limitation is that most of the criteria are based on case series, and few of them have been validated.
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Dermoscopy of genital diseases: a review. J Eur Acad Dermatol Venereol 2020; 34:2198-2207. [PMID: 32531092 DOI: 10.1111/jdv.16723] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 05/20/2020] [Indexed: 12/15/2022]
Abstract
The male and female external genital regions are anatomical areas in which various types of skin disorders may occur. Although most of these conditions can be diagnosed by means of clinical examination and an accurate medical history, in most cases further investigations with time-consuming and/or invasive procedures are needed in order to reach the correct diagnosis. Dermoscopy, as a modern non-invasive tool, is able to better diagnose pigmented and non-pigmented skin tumours along with various inflammatory and infectious skin and appendage disorders. The aim of this paper was to provide a review of the use of dermoscopy in genital disorders based on published data and to include personal experience gained from real life, focusing on any possible gender difference and whether disease mucosal/semimucosal dermoscopy features may differ from those observed on the skin. In conclusion, genital dermoscopy should always be considered during clinical inspection in order to enhance the diagnosis or to rule out those conditions that may look similar but that show a different dermoscopy pattern, thus narrowing down the differential diagnoses and avoiding unnecessary invasive investigations.
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Ringlike pattern as a dermatoscopy sign for vulvar melanosis does not preclude synchronous existence of vulvar melanoma. J Eur Acad Dermatol Venereol 2019; 33:e312-e315. [DOI: 10.1111/jdv.15589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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6
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Dermoscopy and dermatopathology correlates of cutaneous neoplasms. J Am Acad Dermatol 2019; 80:341-363. [DOI: 10.1016/j.jaad.2018.07.073] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 07/01/2018] [Accepted: 07/04/2018] [Indexed: 12/21/2022]
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Abstract
The scope of dermatoscopy has now vastly expanded and shows promising use for characterization of both pigmentary and inflammatory dermatoses affecting the skin, nail, and mucosae. Due to concerns of contamination and spread of infection, dermatoscopy has not been widely studied for genital mucosal dermatoses. In this article, we review the dermatoscopic features of nonvenereal dermatosis affecting the genitalia. Although biopsy is required for a definitive diagnosis, dermatoscopy is useful to identify atypical and suspicious pigmentary lesions. For the inflammatory dermatoses and other benign dermatoses, presence of few characteristic findings can aid in the diagnosis.
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The diagnostic value and histologic correlate of distinct patterns of shiny white streaks for the diagnosis of melanoma: A retrospective, case-control study. J Am Acad Dermatol 2017; 78:913-919. [PMID: 29138058 DOI: 10.1016/j.jaad.2017.11.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 10/24/2017] [Accepted: 11/02/2017] [Indexed: 11/25/2022]
Abstract
BACKGROUND Shiny white streaks (SWSs) are best visualized with polarized dermoscopy and correlate with dermal fibroplasia histopathologically. SWSs have been described at higher frequencies in melanomas than in benign nevi. OBJECTIVE We assessed the diagnostic value of different patterns of SWSs and their histologic correlate in melanocytic lesions. METHODS Polarized dermoscopic images of 1507 histopathologically diagnosed melanocytic neoplasms were analyzed for presence and pattern of SWSs. Histology was also reviewed for correlation. RESULTS Among 1507 melanocytic neoplasms, SWSs were observed in 31 of 144 melanomas (22%) and 22 of 1363 benign neoplasms (1.6%) (P < .001). The sensitivity and specificity of SWSs for melanoma were 22% and 98%, respectively. Diffuse SWSs exhibited the greatest diagnostic value for melanoma, with sensitivity of 11.8% and specificity of 99.5%. Focal central and peripheral SWSs were comparable in diagnostic significance. The presence of SWSs was highly uncommon in dysplastic nevi, whereas in certain benign subgroups of nevi such as Spitz nevi and atypical genital special site nevi, SWSs were not uncommon. Diffuse SWSs correlated with greater breadth of deep fibroplasia than focal SWSs (P = .009), and SWSs correlated with greater Breslow depth among melanomas (P = .007). LIMITATIONS This study was retrospective. CONCLUSION Polarized dermoscopy is a valuable diagnostic tool in the identification of SWSs, a feature that is highly specific for melanoma.
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Early diagnosis of genital mucosal melanoma: how good are our dermoscopic criteria? Dermatol Pract Concept 2016; 6:43-46. [PMID: 27867747 PMCID: PMC5108646 DOI: 10.5826/dpc.0604a10] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/25/2016] [Indexed: 12/18/2022] Open
Abstract
Background There are limited studies on the dermoscopic features of mucosal melanoma, particularly early-stage lesions. Described criteria include the presence of blue, gray, or white colors, with a reported sensitivity of 100%. It is unclear if these features will aid in the detection of early mucosal melanoma or improve diagnostic accuracy compared to naked-eye examination alone. Case An Asian female in her fifties was referred for evaluation of an asymptomatic, irregularly pigmented patch of the clitoral hood and labia minora of unknown duration. Her past medical history was notable for Stage IV non-small cell lung cancer. She denied a personal or family history of skin cancer. Dermoscopic evaluation of the vulvar lesion revealed heterogeneous brown and black pigmentation mostly composed of thick lines. There were no other colors or structures present. As the differential diagnosis included vulvar melanosis and mucosal melanoma, the patient was recommended to undergo biopsy, which was delayed due to complications from her underlying lung cancer. Repeat dermoscopic imaging performed three months later revealed significant changes concerning for melanoma, including increase in size, asymmetric darkening, and the appearance of structureless areas and central blue and pink colors. Histopathological examination of a biopsy and subsequent resection confirmed the diagnosis of melanoma in situ. Conclusion Previously described dermoscopic features for mucosal melanoma may not have high sensitivity for early melanomas. Additional studies are needed to define the dermoscopic characteristics of mucosal melanomas that aid in early detection. Health care providers should have a low threshold for biopsy of mucosal lesions that show any clinical or dermoscopic features of melanoma, especially in older women.
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Non-invasive diagnostic techniques in the diagnosis of squamous cell carcinoma. J Dermatol Case Rep 2015; 9:89-97. [PMID: 26848316 DOI: 10.3315/jdcr.2015.1221] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 12/25/2015] [Indexed: 12/15/2022]
Abstract
Squamous cell carcinoma is the second most common cutaneous malignancy after basal cell carcinoma. Although the gold standard of diagnosis for squamous cell carcinoma is biopsy followed by histopathology evaluation, optical non-invasive diagnostic tools have obtained increased attention. Dermoscopy has become one of the basic diagnostic methods in clinical practice. The most common dermoscopic features of squamous cell carcinoma include clustered vascular pattern, glomerular vessels and hyperkeratosis. Under reflectance confocal microscopy, squamous cell carcinoma shows an atypical honeycomb or disarranged pattern of the spinous-granular layer of the epidermis, round nucleated bright cells in the epidermis and round vessels in the dermis. High frequency ultrasound and optical coherence tomography may be helpful in predominantly in pre-surgical evaluation of tumor size. Emerging non-invasive or minimal invasive techniques with possible application in the diagnosis of squamous cell carcinoma of the skin, lip, oral mucosa, vulva or other tissues include high-definition optical coherence tomography, in vivo multiphoton tomography, direct oral microscopy, electrical impedance spectroscopy, fluorescence spectroscopy, Raman spectroscopy, elastic scattering spectroscopy, differential path-length spectroscopy, nuclear magnetic resonance spectroscopy, and angle-resolved low coherence interferometry.
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In vivo confocal microscopic substrate of grey colour in melanosis. J Eur Acad Dermatol Venereol 2015; 29:2458-62. [PMID: 26403597 DOI: 10.1111/jdv.13394] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 07/27/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND Melanosis is the most common cause of mucosal pigmentation and can be clinically difficult to differentiate from early melanoma (MM). Dermoscopy can help in the distinction between melanosis and MM, but in some instances, melanoses may exhibit overlapping features with MM such as the presence of grey colour. OBJECTIVE We sought to evaluate whether reflectance confocal microscopy (RCM) can help to better understand the dermoscopic features of melanoses in order to assist clinicians in their diagnosis. METHODS All melanoses diagnosed between June 2011 and December 2014 in the Departments of Dermatology of the University of Saint-Etienne (France) and of Modena and Reggio Emilia (Italy), for which dermoscopic and RCM images were available, were included. Twenty-two lesions were biopsied to confirm the clinical diagnosis, whereas the others did not present any change at a follow-up of at least 6 months. The correlation between dermoscopic and RCM features were evaluated by the Spearman's rho correlation coefficient. RESULTS 55 melanoses were studied: 31 of the oral mucosa and 24 of the genital mucosa. 49% (n = 27) of melanoses exhibited a grey colour under dermoscopy. The grey colour correlated with the presence of melanophages under RCM (ρ = 0.424, P = 0.002). CONCLUSION Our findings highlight that the presence of the grey colour on dermoscopy, considered as an alerting feature, is common in melanoses and it is related to the presence of melanin-laden inflammatory cells in the papillary dermis on RCM. When it is present as a 'pure' feature not associated to other colours than brown or to atypical dermoscopical structures, it could be related to the diagnosis of melanosis.
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Noninvasive assessment of benign pigmented genital lesions using reflectance confocal microscopy. Br J Dermatol 2015; 173:1312-5. [PMID: 26076369 DOI: 10.1111/bjd.13947] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dermoscopic and clinical features of pigmented skin lesions of the genital area. An Bras Dermatol 2015; 90:178-83. [PMID: 25830986 PMCID: PMC4371665 DOI: 10.1590/abd1806-4841.20153294] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 03/04/2014] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND The dermoscopic features of vulvar melanosis lesions are well known. To our
knowledge, there are only a few case reports about dermoscopic features of
pigmented genital lesions in male patients. OBJECTIVE To evaluate dermoscopic and clinical characteristics of benign lesions of the
genital area in both males and females, and to assess the distinguishing
dermoscopic criteria of vulvar melanosis and atypical melanocytic nevi of
the genital type. METHODS 68 patients with pigmented genital lesions were included in this
observational study (28 male and 40 female). A punch biopsy was taken from
all pigmented lesions and histopathological examination was performed on all
specimens. RESULTS We histopathologically diagnosed: genital melanosis in 40 lesions, atypical
melanocytic nevi of the genital type in 15 lesions, melanocytic nevi in 9
lesions, seborrheic keratosis in 4 lesions. The most frequent locations were
the glans penis (19 patients, 67.9%) in males and the labia minora (19
patients, 47.5%) in females. The mean age of patients with atypical nevi
(28,6 ± 11,36) was significantly lower than the mean age of patients with
genital melanosis (47,07 ± 15,33). CONCLUSIONS Parallel pattern is prominent in genital melanosis, ring-like pattern is only
observed in genital melanosis. Most pigmented lesions on the genital area
are solitary. Blue-white veil and irregular dots are only observed in AMNGT.
According to these results, we propose that histopathological examination is
performed, especially if blue-white veil and irregular dots are found by
dermoscopy.
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Dermatoscopic features of vulval lesions in 97 women. Australas J Dermatol 2015; 57:48-53. [PMID: 25754966 DOI: 10.1111/ajd.12298] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 11/23/2014] [Indexed: 11/30/2022]
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Vulvar nevi, melanosis, and melanoma: An epidemiologic, clinical, and histopathologic review. J Am Acad Dermatol 2014; 71:1241-9. [DOI: 10.1016/j.jaad.2014.08.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 08/01/2014] [Accepted: 08/13/2014] [Indexed: 02/03/2023]
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Dermoscopic and confocal microscopy patterns of vulvar mucosal melanotic macules. J Am Acad Dermatol 2014; 70:e81-e82. [DOI: 10.1016/j.jaad.2013.10.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 10/15/2013] [Indexed: 11/16/2022]
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Abstract
The anatomic region influences the dermoscopic features of different lesions. In this article, the particular characteristics of the scalp, mucosal membranes, and lesions located on the milk line are explained. In histopathology, the benign melanocytic lesions in these locations are also named nevi of special sites, considering the difficulty of the histopathologic diagnosis.
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Typical and atypical dermoscopic presentations of dermatofibroma. J Eur Acad Dermatol Venereol 2012; 27:1375-80. [PMID: 23176079 DOI: 10.1111/jdv.12019] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Dermatofibroma is a common skin neoplasm that is usually easy to recognize, but in some cases its differentiation from melanoma and other tumours may be difficult. OBJECTIVE To describe the dermoscopic features of dermatofibromas, with special emphasis on the characteristics of atypical patterns, and to calculate pattern frequency according to the patients age and gender, anatomical site and histopathological subtype. METHODS Two groups of patients were consecutively seen, one with dermatofibromas that were surgically excised because of clinically and/or dermoscopically equivocal aspects or following patient request, and another with non-equivocal dermatofibromas. Each lesion was scored for previously reported global dermoscopic patterns and for additional features. RESULTS A typical pattern was observed in 92 of 130 (70.8%) lesions, whereas an atypical pattern, that we named the 'non Dermatofibroma (DF)-like' pattern, was seen in 38 of 130 (29.2%). Atypical dermatofibromas showed features reminiscent of different conditions, such as melanoma in 21(16.2%) cases, vascular tumour in six (4.6%), basal cell carcinoma in five (3.8%), collision tumour in three (2.3%) and psoriasis in three (2.3%). A significant association was found between the 'melanoma-like' pattern/'vascular tumour-like' pattern and males, whereas a trend was observed between the above-mentioned patterns and hemosiderotic/aneurysmal DFs. 'Peripheral pigment network and central white scar-like patch' pattern was found associated with females and classic histopathological variant of DF. CONCLUSION Dermatofibromas may display different morphological faces. The typical dermoscopic patterns allow a confident diagnosis, whereas a full surgical excision is always recommended in all doubtful cases.
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Abstract
Pigmented lesions represent an enormous range of conditions, from benign to malignant tumors, and from infectious to post-inflammatory. Pigmented lesions are much less easily diagnosed on anogenital skin, and clinicians should have a low threshold for biopsy confirmation of diseases not classic in appearance.
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Abstract
Approximately one of every 10 women has a pigmented vulvar lesion. Given the risk of melanomas and pigmented vulvar intraepithelial neoplasia (squamous cell carcinoma in situ), proper evaluation of vulvar pigmented lesions is critical. Most vulvar lesions are benign; however, vulvar lesions grossly, dermoscopically, and histologically can appear atypical compared with pigmented lesions on the rest of the body. Thus, it is imperative to use not only a keen eye but also a low threshold for biopsy.
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Abstract
BACKGROUND The dermoscopic criteria for benign and malignant lesions on the vulva are not well established due to the lack of large series of such lesions. Melanoma should always be included in the differential diagnosis of pigmented lesions on the vulva especially when they are wide, or of recent onset. Elsewhere on the skin dermoscopy plays an important role in the selection of suspicious pigmented lesions, as well as in the selection of the best site to perform the biopsy. OBJECTIVES To analyse the dermoscopic patterns observed in pigmented lesions of the vulva. METHODS We analysed a nonselected consecutive series of 68 histopathologically proven cases comprising five melanomas, 16 naevi, 20 lentigos, 12 benign vulval melanoses, 11 cases of postinflammatory pigmentation, three pigmented cases of usual vulval intraepithelial neoplasia (VIN) and one seborrhoeic keratosis seen at our institution. The dermoscope was covered by translucent disposable food wrap and/or antibacterial gel to prevent possible transmission of infections. Descriptive statistics were performed using multiple correspondence analysis. RESULTS The parallel (37%), ring-like (9%), homogeneous (22%), globular-like (13%) and reticular-like (6%) patterns were observed on benign lesions (naevi, lentigo, vulval melanosis and postinflammatory pigmentation). The cerebriform pattern (6%) was observed only on VIN and seborrhoeic keratosis. The multicomponent pattern (6%) was associated with melanoma (60%). In cases of melanoma we also occasionally observed an irregular pattern, a whitish or blue-whitish veil, irregularly distributed dots and globules and atypical vascular pattern. Using multiple correspondence analysis, we designed a new algorithm for the early detection of vulval melanomas. CONCLUSIONS Dermoscopy can play a role in the noninvasive classification of vulval melanosis. However, further studies of larger collaborative series are needed to validate our vulval melanoma diagnostic algorithm. VIN and seborrhoeic keratosis share the same dermoscopic features and biopsy should be considered for seborrhoeic-like keratosis. In case of doubt pathological examination of a biopsy remains mandatory.
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Melanoma of the vulva: a pigmented lesion is also significant in a non-sun-exposed area. Arch Gynecol Obstet 2009; 280:831-4. [PMID: 19255768 DOI: 10.1007/s00404-009-1011-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Accepted: 02/12/2009] [Indexed: 10/21/2022]
Abstract
PURPOSE The foremost important aetiological factor for malignant melanoma is considered to be sunlight exposure. However, primary lesions are also seen in non-sun-exposed areas. Vulvar melanoma is rare and associated with impaired outcome. Herein, we attempt to increase physicians' awareness for early diagnosis in order to improve prognosis. CASE REPORT A 64-year-old female presented with pruritus and irritation at her external genitalia. At examination a pigmented lesion of the vulva 3 cm in diameter was seen. Incisional biopsy revealed melanoma. Clinical examination and imaging studies did not show evidence for metastatic disease. She underwent wide excision of the melanoma with primary wound closure and biopsy of sentinel lymph nodes, which were free of disease. After a follow-up period of 43 months, she remains free of disease. CONCLUSIONS Literature review shows that prognosis is poorer than at other sites, most probably due more advanced disease at diagnosis. This case demonstrates that early diagnosis by physicians aware of this malignancy at this relatively rare site is of crucial importance since it may result in improved outcome, similar to that of melanoma at more common sites.
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