Congenital tumours and tumour‐like lesions in domestic animals. 3. Horses. A review

Equine congenital papilloma: pathological findings and results of papillomavirus immunohistochemistry in five cases

“…The most commonly reported breed affected is thoroughbred, 9 and two of five of these cases were thoroughbreds. But, these lesions can occur in many breeds, including mules (B.A.…”

“…Congenital squamous papilloma occurs most often in horses. [1][2][3][4][5][6][7][8][9] Congenital fibropapilloma occurs rarely in pigs 13 and cattle. 14 The gross pathological findings in these five cases of equine congenital papilloma are similar to those described previously.…”

“…14 The gross pathological findings in these five cases of equine congenital papilloma are similar to those described previously. 1,4,[7][8][9] Growths are pedunculated with a verrucous (wart-like) to cauliflower-like (smoother) surface. Characteristic histological features are relatively uniform epidermal papillary hyperplasia with variable epidermal vacuolar change but with no evidence of koilocyte formation or other papillomavirus-associated changes.…”

Reproductive Disorders in Horses

“…Some of these tumors are reported as congenital lesions. 37,[45][46][47] Rare reports of the Sertoli cell tumor and a teratocarcinoma as testicular neoplasms exist in the horse. 37 Neoplasia of the testicular cord structures as well as accessory sex glands is extremely uncommon in the horse.…”

Mature teratoma arising from an undescended testis in a horse: comparison between ultrasonographic and morphological features

“…They are benign and slow growing tumours composed of multiple tissues, derived from different germ layers, not native to the area in which they occur [12]. Testicular teratomas in the horses are asymptomatic and frequently cause complications when a cryptorchid horse is submitted to orchiectomy [8].…”