Sean Klepper M.D.
Stephen Lyle, M.D., ...
- Caused by a gram-negative bacillus Bartonella henelae
- Infection caused by a cat scratch or bite, most commonly on the hand or arm of children.
- The initial skin lesion heals within two weeks, and patients may develop systemic symptoms.
- Tender regional lymphadenopathy develops several weeks later, and the lymph nodes are more commonly biopsied than skin lesions.
- Skin lesions may show palisading granulomas surrounding areas of necrobiosis, sometimes with ulceration or epidermal hyperplasia.
- Sometimes the findings are less characteristic, showing only perivascular or lichenoid lymphoplasmacytic or neutrophilic infiltrates.
- Clumps of the bacilli may be visible on Warthin-Starry stain.