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University of Pennsylvania scientists are using AI to mine Reddit threads to evaluate the safety and side effects of prescription drugs

these include congenital melanocytic nevi, Laugier syndrome, and drug-induced exogenous pigmentations.1,7,14,55 In these cases, nonmelanoma-associated Hutchinson sign is the preferred terminology.1 Pseudo-Hutchinson sign refers to the apparent pigmentation of the cuticle arising from transparency of the underlying nail plate.1,14 Nevertheless, the presence of the Hutchinson sign in melanonychias in adults with other atypical features is considered highly suspicious.1,70,71 In parallel, pigmentation of the hyponychium (which appears in more advanced phases) linked with longitudinal melanonychia corresponds to spread of the lesion to acral skin and its presence is also suggestive of subungual melanoma.1,7,9 Finally, it is important to remember that up to 25% of nail melanomas can be amelanotic, presenting as nail dystrophy or an amelanotic module in very advanced phases.1,7,34 The most frequent histopathologic variant of subungual melanoma is acral lentiginous melanoma and diagnosis in early phases can be very difficult.3,7,8,44,51,72 Initially, the only indication is an increased number of melanocytes, which are large, with pyknotic nuclei and atypical features.7,8,33,72 They are distributed irregularly, with a preference for the basal layer of the nail matrix or, less frequently, the nail bed.7,8,72 As with other acral melanomas, formation of melanocytic nests occurs late in the course of the tumor.8,9 Neoplastic melanocytes are large, with hyperchromatic nuclei and elongated dendrites.1,7,8,14,51,72 The ascent of melanocytes to the upper layers of the matrix, considered physiological in this anatomical site, is much more evident, with disordered pagetoid spread that may be accompanied by the presence of melanocytes in the nail plate (Fig

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ElSheikh MG, Hosny MB, Elshenoufy A, Elghamrawi H, Fayad A, Abdelrahman S

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