Nodular/Draining dermatoses Flashcards Preview

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Flashcards in Nodular/Draining dermatoses Deck (10):
1

What are the 3 major differentials for nodules?

1. Infectious
- bacterial
Staph furunculosis or botryomycosis
Mycobacteria
Nocardia/Actinomyces
Acral lick dermatitis causing deep pyoderma

- FUNGAL
Kerion: Microsporum canis/gypseum
Trichophyton mentagrophytes

Eumycotic mycetoma= draining tracts with growths and grains of the fungus present.
Curvularia geniculata (black grains) - SKIN
Pseudoallescheria boydii, Acremonium (white grains) ABDOMEN, DEADLY

Phaeohyphomycosis - pigmented fungi (melanin)

Zygomycosis - live in decaying wood and vegetable matter. RARE

Pythosis - aquatic organism not really a fungus (Pythium insidiosum) gets in DAMAGED TISSUE. pyogranulomatous inflammation. silver stain.
Lagenidiosis - pyogranulomatous inflammation + eosinophils. causes 2 dermatoses; one deadly, one stays local

Blastomycosis

Histoplasmosis

cryptococcus - pigeon poo!

coccidiomycosis

sporotrichosis

- parasitic (demodex)
- viral (papilloma virus)

2. Neoplastic
Histiocytoma (benign cutaneous tumor of langerhans cell)

Cutaneous Histiocytosis - erythematous plaques or nodules in dermis or panniculus face back neck trunk.

Mast cell tumor

cutaneous lymphoma

melanocytoma

trichoblastoma (basal cell tumor)


3. Sterile
- FB reaction
- insect hypersensitivity
- Juvenile cellulitis
- Sterile nodular panniculitis: pyogranulomatous inflammation
- sterile granuloma/pyogranuloma syndrome
- follicular cyst/epidermal inclusion cyst
- sebaceous gland nodules

2

What do you first suspect when cytology of a nodule shows pyogranulomatous inflammation?

INFECTIOUS UNTIL PROVEN OTHERWISE
- Eumycotic mycetoma (Curvularia, Pseudoallescheria, Acremonium)
- Phaeohyphomycosis
- Lagenidiosis (Lagenidium)
- Histoplasmosis
- Sporotrichosis
- Sterile nodular pannilculitis

3

Diagnostic workup of skin nodule?

- FNA & scrape: cytology. look for inflammatory, neoplastic, abnormal cells.
- Biopsy: culture and histopath
- culture & sensitivity: bacterial and fungal
- CBC/Chem/UA for underlying disease

4

Diagnosis of a sterile skin nodule?

diagnosis of exclusion: rule out infection, neoplastic causes

5

Pythosis/Lagenidiosis treatment

Treatment difficult, wide surgical excisions. Itraconazole.

6

Sporotrichosis typical complaint?

non-healing wounds

7

Blastomycosis lesions are typical at ___ junctions

mucocutaneous

8

papilloma virus typically causes warts around ___ mucose in ____dogs.

oral; young

9

What physical findings regarding a nodule cause you to worry?

poor/inflitrative margins, deep nodule, animal has systemic illness, manipulation alters the lesion, location (inoperable? eye? brain/cns? face? genitals?)

10

What are the two rules of Acral Lick dermatitis?!

they are always infected, and always secondary to something!