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Feline leprosy: spontaneous remission in a cat
P Roccabianca1, M Caniatti, E Scanziani
1Istituto di Anatomia Patologica Veterinaria e Patologia Aviare, Università degli Studi di Milano, Italy.
Insights
Feline leprosy, a rare skin condition, was diagnosed in a cat presenting with a solitary lesion. The condition resolved spontaneously without treatment, indicating a potential for self-healing in some feline mycobacterial infections.
Area of Science:
- Veterinary Dermatology
- Infectious Diseases
- Feline Medicine
Background:
- A solitary cutaneous lesion on a domestic shorthair cat prompted investigation for a neoplastic process.
- Fine-needle aspiration biopsy was performed for cytological examination.
Observation:
- Cytology revealed neutrophils, lymphocytes, and acid-fast bacilli within macrophages and giant cells.
- Bacteriological culture for Mycobacterium spp. was negative.
- Intraperitoneal injection of lesion material induced generalized mycobacteriosis in a mouse model.
Findings:
- A diagnosis of feline leprosy was established based on cytological and experimental findings.
- The cat's lesion underwent complete spontaneous remission within 3.5 months.
- The cat remained disease-free for 14 months post-diagnosis without intervention.
Implications:
- This case highlights the possibility of spontaneous resolution in feline leprosy.
- It suggests that some feline mycobacterial infections may have a self-limiting course.
- Further research into the host-pathogen interactions and immune response in feline leprosy is warranted.
Abstract:
A two-year-old, male domestic shorthair with a solitary lesion of the right forelimb was presented for fine-needle aspiration biopsy of a suspected cutaneous, neoplastic process. Neutrophils, lymphocytes, and acid-fast bacilli packed in the cytoplasm of foamy macrophages and giant cells were seen on cytological examination. Bacteriological culture of the material from the skin lesion was negative for Mycobacterium spp. Intraperitoneal injection of homogenized material from the lesion resulted in generalized mycobacteriosis in one mouse after 10 months. Based on these results, a diagnosis of feline leprosy was made. No medical or surgical therapy was performed. Nonetheless, the lesion showed progressive and complete spontaneous remission within 3.5 months from the time of diagnosis; after 14 months, the cat still is free of disease.
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