Clinical approach to tumors of the skin and subcutaneous tissues.

With skin tumors, "a lump is only a lump" until a definitive diagnosis has been made. It is nearly impossible to make an accurate diagnosis solely on clinical signs. In some instances, fine-needle aspirate may be diagnostic; however, in all instances biopsy is the preferred method for definitively diagnosing canine and feline skin tumors. Prognosis and treatment depend on the diagnosis.