Page 71 - Differential Diagnosis in Small Animal Cytology, The Skin and Subcutis

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Pearls and Pitfalls
VetBooks.ir • As cytologically a follicular cyst cannot be definitively differentiated from an infundibu-
lar keratinizing acanthoma and trichoepithelioma, a general diagnosis of ‘keratinized
lesion’ or ‘follicular lesion’ is usually preferred, and follicular cyst is listed as a differential
diagnosis.
• A disseminated form of follicular cysts has been described in a case series that included
five dogs and one cat. Numbers of lesions were more than 20 and exceeded 150–200 in
three of the cases.
• Dermoid cysts are congenital anomalies that occur in young dogs and cats. They arise on
the midline. They contain lamellar keratin, yielding cytological findings similar to an in-
fundibular cyst. Over- represented canine breeds include Rhodesian Ridgeback and Boxer.

Further reading

Adedeji, A.O., Affolter, V.K. and Christopher, M.M. (2017) Cytological features of cutaneous follicular tumours
and cysts in dogs. Veterinary Clinical Pathology 43(2), 143–150.
White, A., Stern, A., Campbell, K. and Santoro, D. (2013) Multiple (disseminated) follicular cysts in five dogs and
one cat. Veterinary Record 173(11), 269.