Page 2761 - Cote clinical veterinary advisor dogs and cats 4th

1437.e2 Nodular Dermatosis

Nodular Dermatosis
VetBooks.ir History and physical

examination

Draining No draining tracts

Larval breathing hole: Multiple skin Fine-needle
• Cuterebriasis scrapings aspirate

Positive Negative Cells Parasite recovered
• Demodicosis • Perform impression recovered Dracunculiasis
• Dirofilariasis smears Dirofilariasis

Cytologic evaluation

Acid-fast stain: Gram stain: Diff-Quik:
• Feline leprosy • Staphylococcus spp. • Foamy macrophages
• Atypic mycobacteria • Proteus spp. • Granulomatous/pyogranulomatous inflammation
• Nocardia (weak • Pseudomonas spp. • Sporothrix schenckii yeast forms
positive) • Actinomyces spp. • Cryptococcosis, blastomycosis, histoplasmosis
• Nocardia spp. • Eosinophilic inflammation (pythiosis, foreign body,
• Rhodococcus equi insect-bite reaction)
• Eosinophilic granulomas
• Neoplastic cells

Skin biopsies for dermatohistopathology and special stains

Noninfectious granuloma/pyogranuloma: Neutrophilic: Eosinophilic:
• Idiopathic sterile pyogranuloma/granuloma • Deep pyoderma • Eosinophilic granulomas
• Idiopathic sterile nodular panniculitis • Familial vasculopathy of • Dracunculiasis
• Reactive histiocytosis (cutaneous, systemic) German shepherds • Dirofilariasis
• Juvenile cellulitis • Abscess • Pythiosis
• Sarcoidosis • Insect-bite granulomas
• Acral lick dermatitis/granuloma • Ruptured hair follicle
• Foreign body reaction
• Cutaneous xanthomatosis

Infectious granuloma/pyogranuloma: Lymphocytic/plasmacytic: Other fibrosing, dysplastic,
• Deep and intermediate mycoses • Lupus profundus or neoplastic cells:
• Phaeohyphomycosis/zygomycosis • Vaccine reaction, • Dermoid cyst
• Mycetoma/pseudomycetoma erythema nodosum • Acral pruritic nodule/fibropruritic nodule
• Actinomycotic infections • Plasma cell pododermatitis • Calcinosis circumscripta
• Mycobacteria/opportunistic • Lymphomatoid granulomatosis • Nodular dermatofibrosis
mycobacteriosis • Pseudolymphoma • Mucinosis
• Canine leishmaniasis • Epitheliotropic lymphoma • Hemangioma
• Plasmacytoma • Mast cell tumors
• Sebaceous hyperplasia/adenoma

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