Shih-tzu Case

Species: Canine
Breed: Shih-tzu
Age: 2yrs
Gender: Male Neutered

Source/History:

Firm, solid, freely movable, confined to site area, focal, from the right lateral chin as indicated in the diagram.

Click here for the IDEXX Pathology Report on this case.

Microscopic Description:

The sample of skin contains a well demarcated, nonencapsulated proliferation of small basaloid cells forming small nests, ribbons, and cords. There is a supportive collagenous stroma. Individual cells have oval nuclei, stippled chromatin, small single to indistinct nucleoli and small amount of eosinophilic cytoplasm. There is minimal nuclear pleomorphism and mitotic figures average <1 per 10 high power field.

Microscopic Interpretation:

Interpretation:   Haired skin: Trichoblastoma

Excision:  Extends to deep margin

Comments:

Trichoblastoma (previously basal cell tumor) is a benign neoplasm of follicular germ cell origin in dogs and cats. Trichoblastomas occur most frequently on the head and neck. With complete excision, local recurrence is not anticipated.

Image Notes:

  1. Low magnification view of the lesion, demonstrating a well demarcated, non encapsulated, multilobulated, dermal mass.
  2. Higher magnification view of the lesion, demonstrating cords of basal epithelial cells supported and subdivided by dense collagenous stroma.

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