Page 598 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

Reproductive system: 2.2 The male reproductive tr act 573

VetBooks.ir 2.167 2.168

Figs. 2.167, 2.168 Immediately pre-operative view
(2.167) of the penis of a gelding showing squamous
cell carcinoma lesions at two sites on the body and a
larger lesion on the glans. The gelding is undergoing
a penile amputation (2.168) and at this stage the
urethrotomy incision has just been completed.

OTHER TUMOURS OF THE 2.169
PENIS AND PREPUCE

Definition/overview
A variety of cutaneous neoplasms, other than SCC,
may affect the skin of the penis and prepuce.

• Sarcoids are fibroblastic tumours of the skin
and are most common in younger horses. As
with other body locations, sarcoids involving
the prepuce or penis may be of the fibroblastic Fig. 2.169 View of a horse with sarcoid lesions at the
nodular (most common), verrucous (warty), base of the prepuce (nodular fibroblastic) and also on
mixed or occult (rare) type (Fig. 2.169). the adjacent skin. (Photo courtesy Graham Munroe)
Preputial and penile sarcoids are managed
similarly to sarcoids in other locations. Surgical • Melanomas may be seen involving the
excision is likely to be the best option, but prepuce or penis of older geldings and stallions
recurrences are common. Cryotherapy reduces (Fig. 2.170). Examination will find melanomas
recurrence, but it must be used with caution in other locations such as the perianal or facial
on penile, preputial and scrotal skin due to the regions. Lesions are usually <3 cm, multiple,
potential for scarring and fibrosis, which might smooth, round and hairless. Melanomas are
alter function (penis and underlying urethra) slow to metastasise. Oral cimetidine (2.5 mg/kg
and fertility (scrotum). q24 h) may be helpful in slowing progression.