[[Mammary Neoplasia|Mammary Neoplasia]] is common in the rat. The most common tumour type is a '''benign fibroadenoma'''. Mammary tissue is extensive in the rat, extending from the neck to the flanks, so mammary neoplasia should be considered when a rat is presented with a mass within this region. | [[Mammary Neoplasia|Mammary Neoplasia]] is common in the rat. The most common tumour type is a '''benign fibroadenoma'''. Mammary tissue is extensive in the rat, extending from the neck to the flanks, so mammary neoplasia should be considered when a rat is presented with a mass within this region. |