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Malignant pilomatricoma in 3 dogs
E E Carroll1, S L Fossey, L M Mangus
1Armed Forces Institute of Pathology, Washington, DC, USA. erica.carroll@med.navy.mil
Veterinary Pathology
|May 15, 2010
Summary
Malignant pilomatricoma, a rare canine neoplasm, was diagnosed in 3 dogs, with 2 showing metastasis. This suggests malignant pilomatricoma may be more common in dogs than previously thought.
Area of Science:
- Veterinary Pathology
- Canine Oncology
Background:
- Malignant pilomatricoma, also known as pilomatrix carcinoma, is considered a rare canine neoplasm.
- Previous literature suggests a low incidence of this tumor in dogs.
Observation:
- Three cases of malignant pilomatricoma in canine patients are presented.
- Histologic features included basaloid cell trabeculae, abrupt keratinization, and ghost cells, indicative of malignancy.
- Two of the three cases exhibited distant metastasis, including bone metastasis.
Findings:
- The study identified 4 malignant pilomatricomas among 13 canine pilomatricomas diagnosed over a 24-month period.
- This incidence rate suggests that malignant pilomatricoma is potentially more common in dogs than previously reported.
Implications:
- Canine malignant pilomatricoma may be underdiagnosed or underreported.
- Further research is warranted to understand the true prevalence and behavior of this canine neoplasm.
