The descriptive epidemiology of udder lesions in Northern Iraqi ewes

Mammary carcinoma arising in an adenoma in a ewe

“…3 Descriptions of mammary gland neoplasia in sheep include a fibroadenoma, 9,15 an adenoma, 1 a hemangiopapilloma of the gland cistern, 28 and a low-grade carcinoma and adenocarcinoma. 19,28 All 5 reported ovine cases had benign to low-grade progression. Neoplasia in goats has been reviewed, and 7 of 102 tumors arose in the udder 17 ; all 7 tumors were mammary adenocarcinomas, and 2 of 2 animals examined had metastatic disease, suggesting aggressive behavior in goats.…”

“…In general, ruminants have only sporadic mammary neoplasia, with a reported incidence in sheep of 7 in 3,693 (0.2%). 13,28 In bitches, reaching the first heat prior to ovariohysterectomy increases the risk of development of mammary neoplasia. 27 Ovariohysterectomy before the first heat cycle is preventive; that protective response declines after 1 y of age.…”

“…5,14,21,25 A review of 673 tumors from sheep in South Africa failed to document mammary neoplasia. 3 Descriptions of mammary gland neoplasia in sheep include a fibroadenoma, 9,15 an adenoma, 1 a hemangiopapilloma of the gland cistern, 28 and a low-grade carcinoma and adenocarcinoma. 19,28 All 5 reported ovine cases had benign to low-grade progression.…”