Penile and preputial tumours in the horse: A retrospective study of 114 affected horses

Abstract

Squamous cell carcinoma is the most common urogenital tumour of the male horse and occurs primarily in old horses. Horses with poorly differentiated SCCs tend to have a higher incidence of regional metastases. Pathology of lymph nodes, even when not palpably enlarged, is a valuable diagnostic exercise. Radiology of the thorax to detect lung metastases is of little value.

RETRACTED ARTICLE: Cyto-histopathological and outcome features of the prepuce squamous cell carcinoma of a mixed breed dog

“…Squamous cell carcinomas (SCCs) are the most common form of penile and preputial neoplasia; however, squamous cell papillomas, melanomas, fibromas, fibrosarcoma and haemangiomas have been reported [11,12]. Penile and/or preputial neoplasia may cause discomfort and in advanced cases can result in systemic disease [13,14].…”

The likelihood of metastases in equidae

“…Of 49 horses with SCC of the eye, adnexa or orbit, the tumour was locally invasive or metastatic in 5 (10.2%) (Lavach and Severin ) and of 82 horses with penile SCC, 7 (8.5%) had regional lymph node metastasis (van den Top et al . ), whilst in a larger series of 114 horses, 28 had regional lymphadenopathy, 9 (32%) of which were confirmed metastases on histopathology. Diagnosis of neoplasia is increasingly common in our ageing equine population but there is a paucity of reports in the literature citing percentage likelihood of occurrence of metastasis of other equine tumours.…”

“…Tumour grading has previously been shown to provide predictive information with regard to nodal metastasis (van den Top et al . ) and this more recent retrospective study by the same group found that of 19 horses in which lymph nodes were examined with histopathology perioperatively, 13 lymph nodes contained metastases with 12 of these cases having had a primary tumour graded as subtype 3 using the authors classification scheme (van den Top et al . ).…”

“…Squamous cell carcinoma (SCC) is the most common tumour of the external genitalia in equines with incidences of 49–82.5% being quoted in the literature (Brinsko ; van den Top et al . ; van den Top et al . ) and is also the most common tumour of the eye and adnexa (Lavach and Severin ).…”

Diagnosis of equine penile and preputial masses: A clinical and pathological perspective

“…A positive correlation between high grade SCCs and metastasis has been demonstrated and it has also been shown that tumour grading is an important prognosticator for survival in horses (van den Top et al . , ). This information, in conjunction with a published classification system (Van den Top et al .…”