06 - Diagnostic Aids

Question 1

(Skin Scrapings)

1. skin scraping is indicated anytime the differential diagnosis includes what?
2. cheap, easy, informative
3. equipment needed (scalpel blade, mineral oil, slides, slips, microscope)

Answer 1

1. microscopic ectoparastic diseases (eg. demodicosis, sarcoptic mange, and cheyletiellosis)

Question 2

(Skin scrapings cont)

Just read circled portion on p30

but also answer these questions

1. superficial scrapings covering a broad area are sufficient for what?
2. To assure that adequate sample is obtained, scrape until you get what?
3. deep scrapings are needed for what?

Answer 2

1. surface dwelling mites such as Cheyletiella, Chorioptes, Demodex gatoi, demodex cornei
2. small amount of blood from laceration
3. deeper-dwelling parasites such as demodex canis, demodex injay and demodex cati

Question 3

(B. Trichogram or Trichography)

(read through this section as well… will cover important points though)

1. what is this?

(interpretation of abnormal findings)

1. presence of broken tips =
2. large melanin clumps =
3. hyphae and spores =
4. the presence of most or all hair shafts in telogen (rest) stage suggests what?
5. what do anagen bulbs look like?
6. telogen?

Answer 3

1. analyzing plucked hairs
2. excessive licking in feline self inflicted alopecia
3. color dilution alopecia
4. dermatophysis
5. a diagnosis of telogen defluxion or endocrinopathy

(normal animals have mix of anagen and telogen hairs)

5. rounded, smooth, shiny, soft
6. club or spear-shaped, rough-surfaced, non-pigmented, straight

Question 4

(C. Direct Examination of Hair and Scales for Dermatophytes)

just read circled portion on p31

Question 5

(D. Wood’s Lamp Examination)

1. just read on p31

Question 6

(E. Cytologic Examination)

just read the rest until p37… seems silly to do flash cards on this stuff