Skin

Question 1

Merkel cell carcinoma acronym AEIOU

Answer 1

A- asymptomatic
E- rapidly enlarging
I- immune suppression
O- older than 50 years
U- UV exposed site 

Polyoma virus 🦠 ( MCPyV IHC)

Question 2

Antibodies in bullous pemphigoid

DIF- linear deposition of IgG and C3 along basement memb.

Answer 2

IgG antibodies to BP230 and BP180.

Others:
Ab to laminin5 - cicatricial pemphigoid
Ab to keratin 5 and 14 - epidermolysis bullosa simplex
Ab to integrity subunit alpha- junctional epudermolysis bullosa

Question 3

Best stain to use to poseudoxanthoma elasticum

Answer 3

Von kossa

Due to calcification of elastic fibers

Question 4

Organism with Marquee sign, GMS neg

Answer 4

Leishmaniasis

Dense dermal infiltrate of L and PCs.

Question 5

DIF in dermatitis herpetiformis

Answer 5

Granular IgA at dermal papillae

VS linear IgA in vancomycin associated disease

Question 6

Most common precipitating factor of erythema multiforme in adults is

Answer 6

Infections with HSV-1

Other causes: infections, drugs and neoplastic conditions

Question 7

What are the features of drug induced Lichenoid dermatitis ?

Answer 7

Eosinophils and focal parakeratosis

These are unusual for LP

Question 8

Which type of psoriasis is triggered by strept infections?

Answer 8

Guttate (raindrop) psoriasis and few other variants

Question 9

Common location of cellular blue Nevus

Answer 9

Sacrum and buttock