Granulomatous hepatitis in dogs: nine cases (1987-1990)

Area of Science:

• Veterinary Pathology
• Canine Internal Medicine

Background:

• Granulomatous hepatitis (GH) is a rare histopathologic finding in dogs.
• Fungal infections are commonly suspected as the primary cause of GH in canine patients.
• A comprehensive understanding of diverse etiologies is crucial for effective management.

Purpose of the Study:

• To review medical records and histopathologic findings of dogs diagnosed with GH.
• To identify and document a wider range of specific causes associated with canine GH.
• To correlate clinical and biochemical findings with histopathologic diagnoses.

Main Methods:

• Retrospective review of medical records and histopathology reports for 9 dogs with GH.
• Analysis of associated diseases and clinical presentations.
• Evaluation of clinicopathologic data, including liver enzymes and physical findings.

Main Results:

• Identified various diseases associated with GH: intestinal lymphangiectasia (2), lymphosarcoma (1), histiocytosis (1), dirofilariasis (1), and histoplasmosis (1).
• In some cases, GH was concurrent with other conditions like granulomatous pneumonitis or periportal hepatitis with temporal muscle wasting.
• All dogs exhibited clinical signs of liver disease (hepatomegaly, icterus, ascites) or elevated liver enzymes (alkaline phosphatase, alanine aminotransferase).

Conclusions:

• Canine granulomatous hepatitis can stem from a wide spectrum of underlying diseases beyond fungal infections.
• Accurate etiological diagnosis is essential for guiding appropriate treatment strategies and providing reliable prognoses.
• Further research into less common causes of GH in dogs is warranted.