Page 92 - Differential Diagnosis in Small Animal Cytology, The Skin and Subcutis

Epithelial Tumours

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VetBooks.ir Differential diagnoses
Sweat gland adenoma
•
Trichoblastoma
•
• Melanocytic tumour (when containing melanin)

Pearls and Pitfalls
• Basal cell tumours usually lack a significant stroma. The presence of slender spindle cells,
especially if numerous, is more typical of trichoblastoma.
• Basal cell tumours are often pigmented and may be confused clinically and microscopic-
ally with melanocytic neoplasms.
• In dogs, tumours previously classified as basal cell tumours have now been reclassified as
trichoblastomas.
• In cats, tumours previously classified as basal cell tumours that show a focal or multifocal
ductal differentiation have been reclassified as aprocrine ductal adenomas.