Squamous Papilloma and plaque Squamous cell carcinoma Penile and preputial tumours in the horse: a retrospective study of 114 affected horses. Van den Top JG, de Heer N, Klein WR, Ensink JM. Van den Top et al (2008) reported finding one basal cell carcinoma of the penis. Van den Top et al (2008) reported finding one adenocarcinoma of the penis. Surgical Management of Penile and Preputial Neoplasms in Equine with Special Reference to Partial Phallectomy.

Rizk A, Mosbah E, Karrouf G, Abou Alsoud M. Survey of equine cutaneous neoplasia in the Pacific Northwest.

Rizk et al (2013) reported on the surgical treatment of stallions with penile or preputial neoplasia and found 15 squamous cell carcinomas, 4 sarcoids, a fibrosarcoma and a melanoma. 77 were squamous cell carcinomas, 6 were melanomas, 1 was an adenocarcinoma, 1 was a fibrosarcoma, one was a basal cell carcinoma and one was a neurofibroma. Van den Top et al (2008) reported on 114 cases and 97 cases were examined histologically. Valentine (2006) published the results of a survey of cutaneous neoplasms and reported multiple cases of squamous cell carcinoma of the penis and prepuce. Physiochemical injury (including trauma) to the penis and prepuce.įoreign bodies Trauma Disturbances of Growth Neoplasia In humans, there is a nonischemic form due to increased arterial flow, and an ischemic form with reduced venous outflow. Little is reported about the pathogenesis in dogs. Persistently erect penises become traumatised, dry, or undergo necrosis. These include persistent erection of the penis, an erection lasting longer than 4 hours without sexual stimulation, or continuous, usually nonsexual erection of the penis, especially due to disease. Metastatic melanoma and squamous cell carcinoma will lead to this if the weight is excessive or there are local neuromuscular dysfunction. Severely debilitated stallions or horse suffering from local neurologic disorders will develop this too. It is commonly called penile prolapse, paralysis or (incorrectly) priapism.Īdministration of phenothiazine tranquilizers was a common cause but once veterinarians were aware of this complication, other causes such as trauma, are more likely. Or inability to retract the penis, is a particular problem in the stallion. Persistent erection, which can lead to paraphimosis, is priapism Phimosis Which is the inability to retract the penis. Phimosis is the inability to extrude the penis. A pathologist should know the terminology so that they can help the clinician should the occasion arise. The listing of diseases is done with the view to the perceived clinical prevalence!įunctional abnormalities of the penis are clinical problems, so the only time a pathologist becomes involved is to exclude causes, or to confirm the presence of some underlying problem. One of the most common diseases is nonspecific posthitis of geldings, yet I have never seen a biopsy of this condition.

Will be toward what you will see as a pathologist, but many diseases simply are not biopsied. Reviewing diseases from the perspective of a surgical pathologist is that the prevalence of diseases as represented by the submission of biopsies, is veryĭifferent from the prevalence seen by or theriogenologists (who are also clinicians!).

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