3 - Derm - Benign and Malignant Melanocytic Lesions - Moles (naevi) Flashcards Preview

CP2 > 3 - Derm - Benign and Malignant Melanocytic Lesions - Moles (naevi) > Flashcards

Flashcards in 3 - Derm - Benign and Malignant Melanocytic Lesions - Moles (naevi) Deck (13):
1

differences between acquired and congenital naevi

acquired - usually appear before 25 - progress through stages 1-3 over time

congenital - at birth, 1% of newborns

2

Acquired naevi - what causes them? when do they appear?

abnormal but benign proliferation of melanocytes in epidermis
appear in adolescence and early adulthood

3

3 main types of acquired naevi?

junctional
compound
dermal

4

3 other types of acquired naevi?

blue
atypical
halo

5

junctional - appearance? where is proliferation?

macular and dark
at dermoepidermal junction - within epidermis

6

Compound - appearance? where are melanocytes?

brown papules (warty)
melanocytes in epidermis and dermis

7

Dermal - confused with? appearance? where?

only in dermis
loss of pigment, light brown to skin coloured
possible to confuse with BCC

8

atypical naevi - similar to? aetiology? risk of?

melanoma
genetic, UV exposure
higher risk of melanoma esp if >50y/FHx

9

Halo naevi - where? who? appearance + why?

back of young adults
white halo due to lymphocyte mediated loss of melanocytes

they are benign

10

blue naevus - appearance and why

blue - melanocytes residing deeper in epidermis

11

2 types of congenital naevi

giant congenital naevi
cafe au lait macule

12

giant congenital naevus - appearance? risk?

"bathing costume naevus"
increased risk of melanoma

13

cafe au lait macule - appearance? multiple can be sign of?

tanned macule, oval usually
multiple can be sign of neurofibromatosis

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