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feline eosinophilic granuloma indolent ulcer lip plaque cat skin lesion veterinary
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Eosinophilic Granuloma Complex in Dogs and Cats
Note: The medical textbook library available here contains human medicine textbooks only — no veterinary titles. The information below is synthesized from peer-reviewed veterinary literature (PubMed) and established veterinary dermatology knowledge.
Overview
The Eosinophilic Granuloma Complex (EGC) is a group of reactive inflammatory dermatoses characterized by eosinophilic and mast cell tissue infiltration. It manifests differently in cats and dogs, and the term encompasses distinct clinical entities.
In CATS
Feline EGC is well-recognized and consists of three distinct lesion types, often occurring concurrently:
1. Indolent Ulcer (Rodent Ulcer / Eosinophilic Ulcer)
| Feature | Details |
|---|---|
| Location | Upper lip (philtrum), less often lower lip or oral mucosa |
| Appearance | Well-demarcated, concave, ulcerated lesion with a brownish-red or yellowish, eroded surface; raised, indurated borders |
| Pruritus | Usually non-pruritic |
| Histopathology | Chronic ulcerative inflammation with mononuclear cells; eosinophils may be sparse |
| Sex predisposition | Possibly female, but not consistent |
2. Eosinophilic Plaque
| Feature | Details |
|---|---|
| Location | Ventral abdomen, medial thighs, perineum |
| Appearance | Raised, erythematous, well-circumscribed, moist, intensely pruritic plaques; may be ulcerated |
| Pruritus | Markedly pruritic |
| Histopathology | Dense eosinophilic infiltrate with spongiosis; "flame figures" (collagen deposition around eosinophil granule contents) |
3. Eosinophilic Granuloma (Linear Granuloma)
| Feature | Details |
|---|---|
| Location | Caudal thighs (linear), oral cavity (tongue, hard palate), lips (raised lip lesion/"pouting lip"), footpads, chin |
| Appearance | Linear, raised, yellow-pink to white papules, plaques, or nodules; coalescing into raised streaks on the caudal thighs; oral lesions are nodular/cobblestone |
| Pruritus | Usually non-pruritic to mildly pruritic |
| Histopathology | Granulomatous inflammation with central collagen degeneration ("flame figures"), eosinophils, giant cells, and histiocytes |
Aetiology (Cats)
Most cases have an underlying hypersensitivity reaction as the trigger:
- Flea allergy dermatitis — most common cause
- Environmental (atopic) allergy
- Food allergy/adverse food reaction
- Insect bite hypersensitivity
- Genetic predisposition — reported in Norwegian Forest Cats (non-pruritic granuloma, possibly autosomal dominant)
- Idiopathic — a minority of cases
Buckley & Nuttall (2012, J Feline Med Surg, PMID: 22736681) emphasize that EGC lesions are clinically recognizable but the underlying aetiology can be challenging to identify, and long-term management is often needed.
Diagnosis (Cats)
- Clinical appearance is usually diagnostic
- Cytology: eosinophils ± mast cells on impression smear
- Histopathology: confirms lesion type
- Allergy workup: intradermal/serology testing, elimination diet trial
- Rule-outs: bacterial or fungal infection, neoplasia (especially mast cell tumor, squamous cell carcinoma for indolent ulcer)
Treatment (Cats)
| Treatment | Use |
|---|---|
| Glucocorticoids (prednisolone/methylprednisolone) | First-line; 1–2 mg/kg/day tapering |
| Triamcinolone (IM/SC) | Effective for single-episode cases |
| Cyclosporine | For recurrent/steroid-resistant cases |
| Oclacitinib (Apoquel) | Off-label in cats; emerging use |
| Essential fatty acid supplementation | Adjunct |
| Allergen-specific immunotherapy | For confirmed atopic cats |
| Address underlying trigger | Flea control, dietary elimination — critical for long-term control |
In DOGS
Eosinophilic lesions in dogs are less common and more heterogeneous than in cats. Dogs do not have the classic "EGC" triad; instead, eosinophilic conditions present in several organ systems:
1. Cutaneous Eosinophilic Granuloma (Oral/Cutaneous)
| Feature | Details |
|---|---|
| Location | Oral cavity (tongue, hard palate), lip, occasionally skin |
| Appearance | Raised, firm, yellow-white to pink nodule or plaque; oral lesions may ulcerate |
| Breed predisposition | Siberian Husky, Cavalier King Charles Spaniel — strong breed associations; also reported in Samoyeds, Malamutes |
| Pruritus | Variable |
| Histopathology | Collagen degeneration with eosinophilic "flame figures," granulomatous reaction, eosinophilic infiltrate |
First reported in dogs by Carroll & Simon (1967, JAVMA, PMID: 6068076).
2. Eosinophilic Pulmonary Granulomatosis (EPG)
| Feature | Details |
|---|---|
| Presentation | Chronic cough, dyspnea, exercise intolerance |
| Imaging | Pulmonary nodules, interstitial pattern, hilar lymphadenopathy |
| Bronchoscopy | Intraluminal mass lesions (distinguishes EG from eosinophilic bronchitis/bronchopneumopathy) |
| BAL cytology | Marked eosinophilia |
| Treatment | Corticosteroids; prolonged survival (>55 months) documented |
Johnson et al. (2019, J Vet Intern Med, PMID: 31468629) categorized eosinophilic lung disease in 75 dogs into eosinophilic bronchitis (EB), eosinophilic granuloma (EG), and eosinophilic bronchopneumopathy (EBP) based on imaging, bronchoscopy, and BAL findings.
Abbott & Allen (2020, J Vet Diagn Invest, PMID: 32180541) provide a detailed case report and literature review of canine eosinophilic pulmonary granulomatosis.
3. Eosinophilic Skin Disease (Canine)
- Less well-defined than feline EGC
- Associated with atopic dermatitis, food allergy, parasitic hypersensitivity
- Bloom (2006, Vet Clin North Am, PMID: 16364781) provides a comparative review of canine and feline eosinophilic skin diseases
Comparative Summary Table
| Feature | Cats — Indolent Ulcer | Cats — Eosinophilic Plaque | Cats — Eosinophilic Granuloma | Dogs — Oral/Cutaneous EG | Dogs — Pulmonary EG |
|---|---|---|---|---|---|
| Location | Upper lip | Ventral abdomen/thighs | Caudal thighs, oral cavity | Oral cavity, lips | Lungs |
| Pruritus | No | Yes (intense) | No/mild | Variable | N/A |
| Histopathology | Chronic ulceration | Eosinophilic spongiosis | Flame figures, granulomas | Flame figures, granulomas | Eosinophilic infiltrate, nodules |
| Key cause | Hypersensitivity | Hypersensitivity | Hypersensitivity/genetic | Breed-related ± hypersensitivity | Idiopathic |
| First-line Rx | Glucocorticoids | Glucocorticoids | Glucocorticoids | Glucocorticoids | Glucocorticoids |
Key References
- Buckley L & Nuttall T (2012). Feline eosinophilic granuloma complex(ities): some clinical clarification. J Feline Med Surg. PMID: 22736681
- Bloom PB (2006). Canine and feline eosinophilic skin diseases. Vet Clin North Am Small Anim Pract. PMID: 16364781
- Johnson LR et al. (2019). Eosinophilic bronchitis, eosinophilic granuloma, and eosinophilic bronchopneumopathy in 75 dogs. J Vet Intern Med. PMID: 31468629
- Abbott DEE & Allen AL (2020). Canine eosinophilic pulmonary granulomatosis: case report and literature review. J Vet Diagn Invest. PMID: 32180541
- Leistra WH et al. (2005). Non-pruritic granuloma in Norwegian forest cats. Vet Rec. PMID: 15866902
Caveat: The integrated medical textbook library used by this system contains only human medicine textbooks. For veterinary-specific textbook excerpts (e.g., Small Animal Dermatology by Muller & Kirk, Skin Diseases of the Dog and Cat by Hnilica, Feline Internal Medicine by August), you would need access to those veterinary titles directly. The above synthesis is drawn from peer-reviewed veterinary journal literature.
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