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

The research article presents a detailed study on penile and preputial tumours in horses, highlighting the high prevalence of squamous cell carcinoma among aged horses. The authors conducted a retrospective analysis on 114 horses, investigating various factors and presenting key findings on the presentation and metastasis patterns of these tumours.

Research Methodology

• For this retrospective study, the researchers examined penile and preputial tumours from a total of 114 male horses.
• The collected data included information on each horse’s age, gelding or stallion status, breed, type and site of lesion, regional lymph nodes involvement, histopathology results (including squamous cell carcinoma grade), and thorax radiographic examination outcomes.

Results of the Research

• The average age of the horses evaluated in the study was 19.5 years and there didn’t appear to be any breed that was more susceptible to these tumours than others.
• Typical clinical signs included irregularities, such as the presence of a mass, ulceration on the penis and prepuce skin, and purulent or blood-filled discharge from the preputial orifice.
• Among the tumours identified, squamous cell carcinoma (SCC) was the most common, followed by papillomas and melanomas.
• Other forms of tumour including basal cell carcinoma, neurofibrosarcoma, adenocarcinoma, and fibrosarcoma were each found in individual horses.
• The study discovered that squamous cell carcinomas with poor differentiation were more likely to metastasise than more differentiated tumours.

Conclusions Drawn

• The researchers concluded squamous cell carcinoma as the most prevalent urogenital tumour in elderly male horses.
• Those with poorly differentiated SCCs demonstrated a higher tendency for regional metastases.
• The research emphasized the importance of lymph nodes pathology as a valuable diagnostic measure, regardless of whether or not they were palpably enlarged.
• Conversely, radiologic examination of the thorax to detect potential lung metastases was deemed of little value in this context.