Table 3.
Types of canine mammary columnar cell lesions and associated ductal hyperplasia in presence of different tumors types.
| Tumor types(**) | CCC(%) | CCH(%) | FEA(%) | Total(%) | |||
| DH | ADH | DH | ADH | DH | ADH | ||
| invasive carcinomas | 3 (11.5) | 3 (11.5) | 1 (50.0) | 1 (50.0) | - | 3 (17.6) | 11 (24.4) |
| ductal carcinoma in situ | 2 (7.7) | 2 (7.7) | - | - | 3 (17.6) | 4 (23.5) | 11 (24.4) |
| benign tumors | 10 (38.5) | 4 (15.4) | - | - | 1 (5.9) | 1 (5.9) | 16 (35.6) |
| without tumor | 2 (7.7) | - | - | - | 1 (5.9) | 4 (23.5) | 7 (15.6) |
| Total | 17 (65.4)(*) | 9 (34.6) | 1 (50.0) | 1 (50.0) | 5 (29.4) | 12 (70.6)(*) | 45 (100) |
(*)Flat epithelial atypia is often associated with ductal hyperplasias with atypia (ADH) and columnar cell changes witout atypia are more frequent in hyperplasias without atypia (UDH) (19/30) (P < 0.05).
(**)Misdorp,1999. International Histological Classification of Tumors of Domestic Animals.
CCC: columnar cell change; CCH: columnar cell hyperplasia without atypia; FEA: flat epithelial atypia; DH: ductal hyperplasia without atypia; ADH: atypical ductal hyperplasia;