Module 7: Acral lesions

Question 1

Acral lesions

Answer 1

Acral nevus
Acral lentiginous melanoma
Melanosis
Hematoma
Pigmented wart
Pigmented due to PPDA

Question 2

What does PPDA stand for?

Answer 2

Paraphenylenediamine

Question 3

Causes of melanosis

Answer 3

Peutz Jeghers syn
Laugier Hunziker Baran syn
Drug induced

Question 4

Parallel furrow pattern

Answer 4

Regular - Nevus

Irregular - Melanoma

Question 5

Parallel ridge pattern

Answer 5

Irregular - Melanoma

Regular - Dermal nevus, melanosis, hematoma, wart

Question 6

Dermal furrow pattern corresponds to …

Answer 6

Crista profunda limitans

Question 7

Derma ridge pattern corresponds to …

Answer 7

Crista profunda intermedia

Question 8

Rule for excising acral lesions

Answer 8

Cut perpendicular to furrows

Question 9

Basic Dermoscopy of parallel pattern

Answer 9

Parallel furrow pattern
Lattice like pattern
Fibrillar pattern

Question 10

Variants of parallel pattern

Answer 10

Single solid line
Single dotted line
Double solid line
Double dotted line
Crista dotted
Crista reticulated
Tram like
Finer parallel

Question 11

3 distinct parts of sole

Answer 11

Weight loading area
Arch area
Marginal area

Question 12

Pattern on weigh loading area

Answer 12

Fibrillar

Question 13

Pattern on arch area

Answer 13

Lattice-like

Question 14

Pattern on marginal area

Answer 14

Crista reticulated

Question 15

Length of fibril

Answer 15

LCos0

Question 16

Where does each fibril start or end?

Answer 16

Furrow

Question 17

Compound nevus - features

Answer 17

Junctional component (brown) tends to regress peripherally with aging
Dermal component (blue grey) tend to remain and elevated later in adulthood

Question 18

Melanosis features

Answer 18

Homogenous PRP

Often multiple lesions

Question 19

Subcorneal hematoma features

Answer 19

Red-black PRP

Question 20

Pigmented wart

Answer 20

Central hyperkeratotic

PRP at periphery

Question 21

PPDA

Answer 21

Multiple areas

PRP