Page 74 - Differential Diagnosis in Small Animal Cytology, The Skin and Subcutis

Cysts, Tumour-like Lesions and Response to Tissue Injury
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VetBooks.ir Pearls and Pitfalls
Due to their nature, these lesions tend to be poorly exfoliative and cytology is often
•
unrewarding. A definitive diagnosis is usually made on histopathology.
• Follicular hamartoma is rare and occurs more frequently in younger dogs. It is composed
of aggregates of enlarged primary follicles, hyperplastic sebaceous glands and may be as-
sociated with a variable amount of stroma.
• Trichofolliculoma is a rare benign follicular neoplasm. It may exfoliate cuboidal epithelial
cells (basaloid follicular epithelial cells), sebocytes, anucleated squamous epithelial cells
and slender stromal cells. Hair shafts may also be seen.

Fig. 7.4. Dog. Fibroadnexal hamartoma. Keratin bars, a few clusters of mature sebocytes and rare stromal mesen-
chymal cells. Wright-Giemsa.