Derm

Question 1

indications for KOH prep

Answer 1

lesions that produce a scale

Question 2

how does KOH work

Answer 2

10% KOH solution digests keratin in tissues but leaves most fungal forms intact

Question 3

how long does it take to determine fungus species?

Answer 3

3-4 weeks (culture)

Question 4

what does a positive KOH prep look like

Answer 4

spaghetti and meatballs appearance

budding hyphae

Question 5

how do you do a scabies prep

Answer 5

Wipe lesion onto a slide with a drop of mineral oil already in place
Mount with a cover slip
Examine under low power

Question 6

what may you see on a scabies prep

Answer 6

Mites, eggs, fecal pellets (scybala)

Question 7

biopsy where you remove the entire lesion

Answer 7

excisional biopsy- take the whole thing

Question 8

What type field does a shave or punch biopsy need to be on

Answer 8

clean field

Question 9

most appropriate biopsy for BCC, actinic keratosis, SCC, nevus (10 mm)

Answer 9

shave biopsy

Question 10

most appropriate biopsy for melanoma

Answer 10

excision or multiple punch biopsies

Question 11

best biopsy for psorasis, infection, dermatitis.

Answer 11

punch bx

Question 12

indications for cryotherapy

Answer 12

benign lesions (warts, SK) 
premalignant lesions (AKs) 
some malignant lesions (BCC, SCC)