VGO 511: Veterinary Andrology and Reproductive Techniques (1+1)

TUMORS OF THE PENIS AND PREPUCE

Tumors of penis may cause phimosis or paraphimosis and prevent normal intromission.

Bulls

• The only significant tumor is the transmissible fibropapilloma caused by virus.

• They are single or multiple, firm, cauliflower like growths.
• Young bulls (9-18 months age) are commonly affected
• Young bulls grouped together frequently mount on each other and may injure prepuce affording an invasion site for lesions.
• Injury to the penis occurs when the young bulls breeds before the separation of penis and prepuce.
• Haemorrhage from the sheath after service and refusal to copulate are frequently noted in bulls with penile tumors.

TOP

Treatment

• Spontaneous recovery from infectious fibropapillomas occurs within 4 Months
• If the tumors are multiple on the penis- treatment is difficult.
• Wart vaccine can be tried. But it has questionable value in affected bulls.
• Semen from affected bulls not to be used because of the danger of transmitting the virus to cows.
• Surgical removal under pudendal nerve block.

Stallion

• Uncommon
• When present usually squamous cell carcinoma of low malignancy
• Should be differentiated from granulomas caused by habronema larvae

Treatment

• The occasional squamous cell carcinoma can be removed by a liberal incision or if necessary by amputation of the penis

TOP

Dogs

The transmissible venereal tumor(TVT) is the most common tumor on the penis and prepuce

• TVT- spread by coitus
• Licking of the vulva or preputial discharge rarely transmits the disease
• Intact cells must be transplanted to transmit the tumor
• Incubation period 5-6 weeks
• All breeds of dogs are susceptible
• It is characterized by a discharge of bloody, fetid exudates from the prepuce of the male.
• When penis is exposed, grayish-red nodular growths are observed on the penis and prepuce
• The tumor masses are friable and bleed when handled.
• In advanced cases the tumor may also be observed involving the inguinal lymph gland
• The tumor ulcerates easily
• The transmissible venereal tumor has been reported widespread throughout the world but most commonly in tropical countries.
• Papillomas, squamous cell carcinomas, sarcomas and other tumors may occur in sheath or on the penis of dogs.

Treatment

• In the dog surgery may be indicated. The earlier surgery is undertaken, the better the success of operation.
• In severe cases where it is difficult or impossible to remove all of the involved tissue, radiation therapy may be indicated.
• Medically treated with Vincristine at the dose rate of 0.025 mg per kg b.w. slow i/v diluted in saline or distilled water and repeated at 7 days interval until complete regression.

TOP