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Epithelioid and Fusiform Blue Nevus of Chronically Sun-damaged Skin, an Entity Distinct From the Epithelioid Blue Nevus of the Carney Complex

Authors: Pedram, Yazdan; Zahra, Haghighat; Joan, Guitart; Pedram, Gerami;

Epithelioid and Fusiform Blue Nevus of Chronically Sun-damaged Skin, an Entity Distinct From the Epithelioid Blue Nevus of the Carney Complex

Abstract

Epithelioid blue nevus (EBN) was first described in patients with Carney complex (CNC) and subsequently shown to also occur sporadically. Over 50% of patients with CNC harbor mutations in the gene PRKAR1A, which codes for protein kinase A regulatory subunit 1α (R1α) involved in the signaling pathway regulating melanogenesis and melanocytic proliferation. Immunohistochemical expression of R1α has been shown to be absent in the majority of pigmented epithelioid melanocytomas and all CNC-associated EBNs but present in melanomas and other melanocytic nevi. We have observed several examples of EBN occurring in chronically sun-damaged (CSD) skin with a predominance of epithelioid morphology but also containing a component of fusiform and conventional blue nevus cells, which we have termed epithelioid and fusiform blue nevus of CSD skin. Several of these cases demonstrated notable pleomorphism and nuclear atypia with rare mitotic activity raising concern for the possibility of melanoma; however, the clinical outcomes, detailed histologic review, and molecular results were most consistent with a benign melanocytic neoplasm. We report our clinical, histopathologic, immunohistochemistry, and fluorescence in situ hybridization experience with this distinct entity of epithelioid and fusiform blue nevus and demonstrate that it is a unique subtype of blue nevus occurring on CSD skin with a higher frequency of an associated conventional blue nevus component compared with EBN and without association with CNC or loss of R1α expression typically found in pigmented epithelioid melanocytoma and CNC-associated EBN. We also postulate that the epithelioid pattern may represent a subclone of the conventional blue nevus component induced by chronic UV damage.

Keywords

Adult, Aged, 80 and over, Male, Skin Neoplasms, Cyclic AMP-Dependent Protein Kinase RIalpha Subunit, DNA, Neoplasm, Middle Aged, Diagnosis, Differential, Nevus, Blue, Nevus, Epithelioid and Spindle Cell, Biomarkers, Tumor, Sunlight, Humans, Female, Photosensitivity Disorders, Carney Complex, In Situ Hybridization, Fluorescence, Aged, Skin

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
8
Average
Average
Average
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