Multipele dermoïd sinuscysten op de kop van een dwergschnauzer

A one-year-and-nine-months-old, neutered, female Miniature schnauzer was presented to the primary care veterinarian with a skin lesion between the eyebrows. There were multiple papulae present at birth, and later, small fistulae with protruding hair bundles appeared. Topical antibiotic therapy and epilation of the hairs only brought temporary relief and a presumptive diagnosis of dermoid sinus cysts was made. The dog was referred and the skin lesions were surgically excised. During histopathological examination, the lesion was diagnosed as multiple dermoid sinus cysts, a consequence of the incomplete separation of the ectoderm during embryogenesis. Depending on the depth of the tubular dermal invaginations and the location of the lesions, different types have been recognized. This is the third dog described in the literature with dennoid sinus cysts on the head.