From Dog
Cut section appearance of a trichoblastoma from a dog[1]

Canine trichoblastoma are a skin disease characterized by benign neoplasia of follicular germ cells[2].

A breed predisposition has been reported in the Kerry Blue Terrier, Bichon Frise, American Cocker Spaniel and Welsh Springer Spaniel[1].

These tumors were originally classified as basal cell tumors but have since been reclassified.

Benign variant forms such as clear cell trichoblastoma have also been reported in the dog[3].

Trichoblastoma usually appear as an elevated pigmented or cystic mass varying in size from 1 - 5 cm overlying areas of alopecia and hyperpigmentation. the affected area may be ulcerated and they need to be distinguished from mast cell tumors, hemangiopericytomas, trichoepithelioma, tricholemmoma[4] and melanomas[5].

Surgical excision is usually curative.


  1. 1.0 1.1 University of Pennsylvania
  2. De Vico G et al (2011) Fractal pattern of canine trichoblastoma. Anal Quant Cytol Histol 33(3):151-157
  3. Sharif M & Reinacher M (2006) Clear cell trichoblastomas in two dogs. J Vet Med A Physiol Pathol Clin Med 53(7):352-354
  4. Abramo F et al (1999) Survey of canine and feline follicular tumours and tumour-like lesions in central Italy. J Small Anim Pract 40(10):479-481
  5. Chalita MC et al (2001) Nonaspiration fine needle cytology and its histologic correlation in canine skin and soft tissue tumors. Anal Quant Cytol Histol 23(6):395-399