Module 7: Acral lesions Flashcards
Acral lesions
Acral nevus Acral lentiginous melanoma Melanosis Hematoma Pigmented wart Pigmented due to PPDA
What does PPDA stand for?
Paraphenylenediamine
Causes of melanosis
Peutz Jeghers syn
Laugier Hunziker Baran syn
Drug induced
Parallel furrow pattern
Regular - Nevus
Irregular - Melanoma
Parallel ridge pattern
Irregular - Melanoma
Regular - Dermal nevus, melanosis, hematoma, wart
Dermal furrow pattern corresponds to …
Crista profunda limitans
Derma ridge pattern corresponds to …
Crista profunda intermedia
Rule for excising acral lesions
Cut perpendicular to furrows
Basic Dermoscopy of parallel pattern
Parallel furrow pattern
Lattice like pattern
Fibrillar pattern
Variants of parallel pattern
Single solid line Single dotted line Double solid line Double dotted line Crista dotted Crista reticulated Tram like Finer parallel
3 distinct parts of sole
Weight loading area
Arch area
Marginal area
Pattern on weigh loading area
Fibrillar
Pattern on arch area
Lattice-like
Pattern on marginal area
Crista reticulated
Length of fibril
LCos0
Where does each fibril start or end?
Furrow
Compound nevus - features
Junctional component (brown) tends to regress peripherally with aging Dermal component (blue grey) tend to remain and elevated later in adulthood
Melanosis features
Homogenous PRP
Often multiple lesions
Subcorneal hematoma features
Red-black PRP
Pigmented wart
Central hyperkeratotic
PRP at periphery
PPDA
Multiple areas
PRP
