logo Benign melanocytic lesions key points test

Skin lesions

Benign melanocytic lesions key points test

Dermoscopy is used to differentiate: #! Benign pigmented lesions from melanoma # Amelanotic melanoma from basal cell carcinoma #! Atypical naevus from melanoma # Dermatitis from psoriasis Explanation: Dermoscopy is used to differentiate benign pigmented lesions from melanoma. Match the dermoscopic feature with the picture: Mix and match: : Red or blue lacunes characteristic of haemangioma : Multiple colours characteristic of melanoma : Homogenous pigmentary pattern in benign melanocytic naevus : Keratin-filled crypts characteristic of seborrhoeic keratosis Match the pigmented lesion with its histology: Mix and match: Ephelis : Hyperpigmented keratinocytes Lentigo : Melanocytic hyperplasia at dermal-epidermal junction Compound naevus : Naevus cells at dermal-epidermal junction and dermis Blue naevus : Naevus cells in dermis (heavily melanized) Intradermal naevus : Naevus cells in dermis (unmelanized) Which of the following statements are correct? # Benign skin lesions do not require pathological examination #! Spitz naevus can be difficult to distinguish from melanoma # A punch biopsy from the darkest part of a mole is the best way to identify malignant change # The only way to remove hair from a mole is to excise the whole lesion Explanation: Almost all skin lesions should be subjected to pathological examination after they have been removed because melanoma is frequently misdiagnosed clinically. Spitz naevus is sometimes difficult to distinguish clinically and histologically from melanoma. A suspicious pigmented skin lesion should be excised with at least a 2mm margin. Hair can be removed from a mole by plucking, electrolysis, laser epilation or by excision of the entire mole.