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Knee Desmoplastic Melanoma, an Uncommon Tumor, Disguised as a Malignant Peripheral Nerve Sheath Tumor: A Case Report and Review of the Literature.
Cureus
December 2024
Medical Oncology, Mohammed VI University Hospital, Oujda, MAR.
Desmoplastic melanoma is a rare and distinct subtype of cutaneous melanoma, it presents diagnostic challenges due to the lack of specific clinical features and overlapping histopathological characteristics with other malignancies, which necessitate careful clinicopathological correlation and advanced immunohistochemical profiling. While surgical excision remains the cornerstone of treatment, advances in precision medicine, particularly immune checkpoint inhibitors, have shown promise in improving outcomes for unresectable and metastatic desmoplastic melanoma. We present a case study involving a 52-year-old woman misdiagnosed with a malignant peripheral nerve sheath tumor and later identified as desmoplastic melanoma through re-evaluation of histopathological and immunohistochemical findings.
View Article and Find Full Text PDFDesmoplastic melanoma in Sweden in 2009-2022: A population-based registry study demonstrating distinctive tumour characteristics, incidence and survival trends.
J Eur Acad Dermatol Venereol
January 2025
Department of Oncology and Pathology, Karolinska Institutet, Stockholm, Sweden.
Background: Desmoplastic melanoma (DM) is a rare subtype, accounting for less than 5% of primary cutaneous invasive melanomas. DM often arises in chronically sun-exposed skin, in older individuals. While the incidence of cutaneous melanoma has increased globally, trends specific to DM are less documented and studies on survival outcomes for DM are inconsistent.
View Article and Find Full Text PDFThe Diagnostic Utility of PRAME in Primary Cutaneous Dedifferentiated and Transdifferentiated Melanomas.
J Cutan Pathol
January 2025
Department of Anatomical Pathology, Dorevitch Pathology, Heidelberg, Victoria, Australia.
Melanomas show a wide spectrum of clinical, morphological, immunohistochemical, and molecular features, which can impact treatment and prognosis. Dedifferentiated and transdifferentiated melanomas (DTM) are defined as melanomas which have lost conventional melanocytic morphologic and immunohistochemical features, showing sarcomatous morphology and/or immunohistochemical staining of other cell lineages, and as such, can be mistaken for other entities such as collision tumors and undifferentiated spindle cell tumors. In this series, we highlight the utility of preferentially expressed antigen in melanomas (PRAME) in diagnosing undifferentiated/dedifferentiated melanomas.
View Article and Find Full Text PDFDesmoplastic melanoma in the era of immune checkpoint blockade.
J Am Acad Dermatol
November 2024
Division of Endocrine and Oncologic Surgery, Department of Surgery, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
Cyclin-Dependent Kinase Inhibitors in the Rare Subtypes of Melanoma Therapy.
Molecules
November 2024
Department of Histology and Embryology, Faculty of Medicine, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, 85-067 Bydgoszcz, Poland.
Melanoma occurs in various forms and body areas, not only in the cutis, but also in mucous membranes and the uvea. Rarer subtypes of that cancer differ in genomic aberrations, which cause their minor sensibility to regular cutaneous melanoma therapies. Therefore, it is essential to discover new strategies for treating rare forms of melanoma.
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