5,312 results match your criteria: "Lentigo"

Perifollicular projections in a lentigo maligna of a 35-year-old patient.

Semergen

December 2024

Department of Dermatology, Hospital Clínic de Barcelona, Universitat de Barcelona, Barcelona, Spain; Department of Dermatology, Hospital de Figueres, Fundació Alt Empurdà, Spain. Electronic address:

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Melanoma of the lentigo maligna (LM) type is most commonly located on the head and neck region. This subtype of melanoma poses surgical challenges due to its location on anatomically sensitive areas and frequent presence of subclinical extension. To analyze the reconstruction patterns of LM patients undergoing margin-controlled surgery.

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Background: Understanding the factors influencing age at melanoma diagnosis by sex and anatomic site is crucial for developing effective prevention and early detection strategies. While previous research has highlighted sex-based differences in melanoma incidence by age and anatomic distribution, the underlying mechanisms remain unclear. We aimed to investigate sex-specific patterns in melanoma age at diagnosis across different anatomic sites and thickness categories, considering the potential influence of disease progression and detection rates.

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Background: Factors associated with nonadherence to guideline-recommended complete excision of suspicious cutaneous lesions are unclear.

Objective: The purpose of this study was to analyze patient, melanoma, and clinician factors associated with initial diagnostic biopsy type and determine whether unwarranted variation from guidelines occurred.

Methods: This population-based, cohort study involved the analysis of data from questionnaires completed by clinicians who managed patients with newly diagnosed, histopathologically confirmed primary invasive cutaneous melanomas reported to the New South Wales Cancer Registry between 2006 and 2007.

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Deciphering the role of skin aging in pigmentary disorders.

Free Radic Biol Med

December 2024

Department of Dermatology, Huashan Hospital, Fudan University, No.12 Wulumuqi Zhong Road, Shanghai 200040, PR China. Electronic address:

Article Synopsis
  • * The review highlights how skin aging can lead to pigmentary disorders, such as hyperpigmentation (like melasma) and hypopigmentation (like vitiligo).
  • * It discusses the mechanisms behind how aging affects skin pigmentation and proposes possible treatment strategies for managing skin aging and related pigmentary issues.
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Devonian Harpetidae from the central and eastern Anti-Atlas, Morocco.

Zootaxa

May 2024

12 Crescent Grove; London SW4 7AH; UK.

The systematics of 37 new species of Devonian Harpetidae from the central and eastern Anti-Atlas Mountains, Morocco, are described. The new material comes from the Dra-Tafilalet region and the province of Tata. A cladistic study was undertaken involving 138 taxa with the objective of assigning the new taxa to the appropriate genera, which are, as far as possible, monophyletic.

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Background: Lentigo maligna (LM), a type of melanoma in situ (MIS), usually develops on sun-damaged skin in the elderly. If left untreated, it may advance to the point of dermal invasion, developing into lentigo maligna melanoma (LMM). While surgeons have achieved robust clinical outcomes for LM treated with Mohs micrographic surgery (MMS), performing this treatment for LMM remains controversial and is not standard amongst all Mohs surgeons.

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Article Synopsis
  • Lentigo maligna (LM) and LM melanoma (LMM) are challenging to surgically remove due to unclear boundaries, especially on the face where minimizing tissue excision is important.
  • This study evaluated the long-term effectiveness of using Reflectance Confocal Microscopy (RCM) alongside the "spaghetti" surgical technique for excising LM/LMM in 70 patients.
  • Findings showed a 5.7% recurrence rate over an average of 6.3 years, with the RCM method achieving effective margin clearance (2.7 mm) while reducing tissue removal compared to traditional methods (6.7 mm).
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The Skin-Lightening Power of Tirbanibulin 1% Ointment.

Dermatol Ther (Heidelb)

November 2024

Department of Clinical and Experimental Medicine, Section of Dermatology, University of Messina, Messina, Italy.

Article Synopsis
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Article Synopsis
  • Facial pigmented skin lesions are common, especially in South-European countries, and can be either malignant or benign; diagnosing them can be challenging, even for specialists like dermatologists.* -
  • A study was conducted to assess the impact of a one-day dermoscopy training course on ophthalmologists, focusing on their ability to evaluate periorbital pigmented lesions through clinical and dermoscopic analysis.* -
  • Results showed that before the training, ophthalmologists had an accuracy of 63.7%, but after the course, their sensitivity improved, indicating a positive effect of the training on their diagnostic skills.*
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Lentigo maligna (LM) often poses a diagnostic challenge due to its clinical and dermoscopic mimicry of benign lesions, leading to delayed diagnosis. Focal areas of reticular disruption have been described as one of the earliest dermoscopic signs observed. To describe a novel dermoscopic sign in LM, namely the presence of a parallel pigmented network.

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Melanomas on the dorsum of the hand are exceedingly rare, with limited documentation in medical literature. This report presents seven cases of dorsal hand and finger melanomas, encompassing patients from Australia, New Zealand and Turkey, predominantly women with a mean age of 53 years. The majority were invasive, with a mean Breslow thickness of 1.

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Reflectance confocal microscopy for margin mapping of melanoma of the lentigo maligna type: A systematic review and meta-analysis.

J Eur Acad Dermatol Venereol

November 2024

Department of Dermatology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile.

Melanoma of the lentigo maligna (LM) type and its invasive counterpart, lentigo maligna melanoma (LMM), occur in chronically sun-damaged skin and tend to have subclinical extension that makes presurgical margin mapping challenging. Reflectance confocal microscopy (RCM) is a non-invasive imaging modality that enables in vivo visualization of the skin at the cellular level, allowing for adequate estimation of LM/LMM margins. We aimed to perform a systematic review and meta-analysis evaluating RCM's performance compared with histopathology in margin mapping of LM/LMM.

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Lentigo maligna (LM) is a growing problem worldwide and the main type of melanoma in situ in some Caucasian populations. It presents as a spectrum from atypical intraepidermal melanocytic proliferation (AIMP) to invasive lentigo maligna melanoma (LMM). Accurate diagnosis and staging are crucial for determining appropriate management strategies.

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[Current research status of Peutz-Jeghers syndrome in children].

Zhongguo Dang Dai Er Ke Za Zhi

October 2024

Department of Digestive Nutrition, Hunan Children's Hospital, Changsha 410007, China.

Article Synopsis
  • - Peutz-Jeghers syndrome (PJS) is a rare genetic disorder caused by mutations in the STK11/LKB1 gene, leading to skin pigmentation and multiple polyps, which increase cancer risk.
  • - Complications of PJS include gastrointestinal issues like bleeding and blockage, with a high risk for intussusception in children that can affect their growth and require surgery.
  • - The article discusses the current knowledge on the clinical features, causes, diagnosis, and treatment options for PJS, particularly in pediatric patients.
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Comparative Analysis of AI Models for Atypical Pigmented Facial Lesion Diagnosis.

Bioengineering (Basel)

October 2024

Dermatology Unit, Department of Medicine, Surgery and Neuroscience, University of Siena, 53100 Siena, Italy.

Article Synopsis
  • Diagnosing atypical pigmented facial lesions (aPFLs) is difficult for dermatologists and crucial for patient care, as incorrect diagnoses can lead to mismanagement and delays in treatment.
  • The study compared machine learning and deep learning models to improve diagnostic accuracy of aPFLs using 1197 dermoscopic images classified into seven categories, focusing on the potential role of AI in supporting clinicians.
  • Results showed that while dermatologists were 71.2% accurate in identifying malignant versus benign lesions, their accuracy dropped to 42.9% when distinguishing among specific lesions, highlighting the complexity of aPFL evaluations.
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Background: Melanoma in young adults significantly impacts the survival of this age group. There are limited studies that analyze melanoma characteristics in young patients. We aimed to describe the epidemiological, clinical, and histological characteristics of melanoma in young adults and their temporal trends over the last decades.

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Cutaneous melanoma in situ (MIS), also known as 'stage 0 melanoma', is a collection of malignant melanocytes in the epidermis and epithelial adnexa, without evidence of microinvasion to the papillary dermis. Distinct histologic subtypes include lentigo maligna (LM), superficial spreading (SS) MIS and acral lentiginous (AL) MIS. LM is the most common subtype, usually diagnosed later in life (median age at diagnosis of 66-72 years) and associated with cumulative ultraviolet radiation exposure.

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