Image Quiz: Dermatology—The case of the crusty cat


Image Quiz: Dermatology—The case of the crusty cat

Jun 08, 2011

This 8-year-old neutered male domestic shorthaired cat has a two-month history of pruritic generalized crusting dermatitis that has been poorly responsive to antibiotics and bathing (Figure 1). Six weeks ago, a mediastinal thymoma was surgically removed; the crusting dermatitis preceded the surgery and persisted unchanged postoperatively.

Figure 1

Cytologic examination is performed on samples of exudate under pinnal crusts (Figure 2) and on moist crusts from the ventral trunk (Figure 3).

Figure 2

Figure 3

What is your tentative diagnosis?

a) Cutaneous lymphoma

b) Pemphigus foliaceus

c) Dermatophytosis

d) Bacterial pyoderma

e) Thymoma-associated exfoliative dermatosis

f) Both B and D

More Image Quizzes

Image quiz: Persistent evidence of parasites on a fecal flotation test

This beagle mix has been treated multiple times for similar findings. Can you figure out what’s going on?

Image Quiz: Can this dog's teeth be saved?

Test your skills at assessing troubled teeth with this quick veterinary dentistry quiz.

Equine Image Quiz: A large, ulcerated abdominal lesion

The itchy, growing wound also contains small, gritty masses. What is the most likely diagnosis?