Premalignant Skin Lesions, Keratinocyte Carcinomas, Nevi and Malignant Melanoma
Connect the major pathological, clinical and diagnostic relationships of the topic for rapid revision.
1. THE TOPIC IN ONE CONNECTED FLOW
This topic connects abnormal growth of keratinocytes and melanocytes with their clinical appearance and histological diagnosis. Chronic epithelial injury may progress through premalignant change to carcinoma, while melanocytic lesions range from benign nevi to melanoma. Clinical morphology raises suspicion, but histopathology establishes the definitive diagnosis.
2. KEY CLINICAL CONNECTIONS
Rough, firm or keratotic lesion → squamous differentiation → keratin pearls / intercellular bridges → SCC.
Pearly translucent papule + telangiectasia → basaloid proliferation → peripheral palisading / stromal retraction → BCC.
Symmetry + regular border + stable color → favors benign nevus.
Asymmetry + irregular border + variable pigmentation or change → suspicious lesion → dermoscopy → histopathological assessment when indicated.
Clinical evolution → increasing asymmetry, border irregularity or color variation → suspicion of melanoma.
Atypical melanocytes + pagetoid spread → radial growth → deeper vertical invasion → greater invasive potential.
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