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Image Quiz: Dermatology-A growing eyelid mass

December 13, 2010
Kimberly S. Coyner, DVM, DACVD

What's the cause of this pink dermal mass in a pup?

This puppy has a raised, pink, dermal mass on its eyelid that is increasing in size.

An intralesional injection of triamcinolone was administered with no improvement. A fine-needle aspirate of the mass was obtained for cytologic examination.

What is your diagnosis?

a) Mast cell tumor

b) Cutaneous lymphoma

c) Histiocytoma

d) Plasmacytoma

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