Page 489 - Feline diagnostic imaging

References 501
in the caudal abdomen, further evaluation was performed Teratomas are more likely to occur in ovaries than in tes ­
with excretory urography and ultrasonography. ticles but a teratoma was reported in a cryptorchid cat
Ultrasonography is useful in determining the relation­ [20]. Rare testicular tumors can also occur in extrates­
ship between prostatic and paraprostatic cysts and the uri­ ticular locations. Five male cats developed secondary
nary tract. If ultrasound is unavailable, contrast radiography male characteristics 5–13 years after castration caused by
(excretory urography or cystography) can be used to evalu­ 1–1.5 cm interstitial cell tumors located in the scrotal
ate these structures. In one case, postmortem examination skin or spermatic cord. Clinical signs resolved following
showed that the cyst originated in the prostate and was excision of affected tissue [21, 22]. Another cat devel­
connected to the urethra. After a mass was palpated caudal oped both an interstitial cell tumor and a Sertoli cell
to the urinary bladder of another cat with constipation, tumor in one retained testicle. Increased aggression,
vomiting, and fever, ultrasonography revealed a hypo­ inappropriate urination, and malodorous urine were
echoic mass measuring 2.2 cm. Fine needle aspiration led apparent in that cat prior to removal of the neoplastic
to the diagnosis of a pyogranulomatous prostatic abscess testicle [23].
that was subsequently treated surgically by omentalization Retained testicles can be identified with ultrasonography
[17]. In dogs, some prostatic abscesses contain cellular anywhere between the caudal pole of the ipsilateral kidney
fluid that swirls within the structure on ultrasonographic and the inguinal region [24]. In addition to neoplasia being
examination when the patient is moved. more frequent in cryptorchid testicles, other problems can
occur including testicular torsion and persistent male
behavior (aggression, strong‐smelling urine, and territorial
28.7.2 Testicular Disease
marking) [22]. The retained testicle is often smaller than a
Testicular tumors are rare in cats compared to dogs. scrotal testicle and might be difficult to image among the
Although Sertoli cell tumors have been reported, the abdominal contents. Hormonal analysis or the presence of
condition usually occurs in a cryptorchid testicle and is penile spines in the absence of a scrotal testicle assist in
usually not associated with feminizing syndrome [18, 19]. diagnosis of a retained testicle.

References

1 Woodland, M., Pack, L., Rist, P., and Crane, B. (2014). 7 Ferretti, L.M., Newell, S.M., Graham, J.P., and Roberts,
Comparison of digital radiography, ultrasonography, and G.D. (2000). Radiographic and ultrasonographic
positive contrast vaginourethrography for determining evaluation of the normal feline postpartum uterus. Vet.
reproductive status of female cats. Vet. Radiol. Ultrasound Radiol. Ultrasound 41: 287–291.
55: 368–373. 8 Payan‐Carreira, R. and Martins‐Bessa, A.C. (2008).
2 Gatel, L., Gory, G., Chalvet‐Monfray, K. et al. (2016). Ultrasonographic assessment of the feline mammary
Intra‐ and inter‐observer variability in ultrasono­ gland. J. Feline Med. Surg. 10: 466–471.
graphical measurements of the uterus and ovaries in 9 Cullen, W.C., Fletcher, T.F., and Bradley, W.F. (1983).
healthy, non‐pregnant queens. J. Feline Med. Surg. 18: Morphometry of the male feline pelvic urethra. J. Urol.
110–117. 129: 186–189.
3 Feeney, D.A. and Johnston, G.R. (2007). The uterus, 10 Nak, D., Nak, Y., and Tuna, B. (2009). Follow‐up
ovaries, and testes. In: Textbook of Veterinary Diagnostic examinations after medical treatment of pyometra in cats
Imaging, 5e (ed. D.E. Thrall), 739. St Louis: Elsevier. with the progesterone‐antagonist aglepristone. J. Feline
4 Haney, D.R., Levy, J.K., Newell, S.M. et al. (2003). Use of Med. Surg. 11: 499–502.
fetal skeletal mineralization for prediction of parturition 11 Axnér, E., Ågren, E., Båverud, V., and Bodil Ström Holst,
date in cats. J. Am. Vet. Med. Assoc. 223: 1614–1616. B.S. (2008). Infertility in the cycling queen: seven cases. J.
5 Zambelli, D., Caneppele, B., Bassi, S., and Paladini, C. Feline Med. Surg. 10: 566–576.
(2002). Ultrasound aspects of fetal and extrafetal structures 12 Caney, S.M.A., Holt, P.E., Day, M.J. et al. (1998). Prostatic
in pregnant cats. J. Feline Med. Surg. 4: 95–106. carcinoma in two cats. J. Small Anim. Pract. 39: 140–143.
6 Beck, K.A., Baldwin, C.J., and Bosu, W.T.K. (1990). 13 Tursi, M., Costa, T., Valenza, F., and Aresu, L. (2008).
Ultrasound prediction of parturition in the queen. Vet. Adenocarcinoma of the disseminated prostate in a cat. J.
Radiol. Ultrasound 31: 32–35. Feline Med. Surg. 10: 600–602.