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Tierarztl Prax Ausg K Kleintiere Heimtiere 2019; 47(03): 202-208
DOI: 10.1055/a-0886-0854
Kasuistik
© Georg Thieme Verlag KG Stuttgart · New York

Monorchismus bei einem Kater

Monorchism in a tomcat
Sophie Backhaus
Tierklinik Dr. Krauß Düsseldorf GmbH, Düsseldorf
,
Maximiljan Krauß
Tierklinik Dr. Krauß Düsseldorf GmbH, Düsseldorf
› Author Affiliations
Further Information

Publication History

25 March 2018

10 August 2018

Publication Date:
18 June 2019 (online)

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Zusammenfassung

Bei einem 9 Monate alten Kater, der zur Kastration in der Klinik vorgestellt wurde, war nur der rechte Hoden im Skrotum palpierbar. Der Kater stammte aus einer Inzuchtpaarung. Es bestand zunächst der Verdacht eines Kryptorchismus, doch konnte durch weiterführende Untersuchungen (Ultraschall, diagnostische Laparotomie) kein kryptorcher linker Hoden identifiziert werden. Die histopathologische Untersuchung des entfernten rechten Hodens ergab ein unauffälliges Organ mit Spermatogenese. Bei den im Rahmen der Laparotomie entnommenen Gewebeproben aus dem subkutanen Gewebe des Inguinalbereichs zeigten sich am proximalen Ende des Vas deferens nur Nebenhodenanteile mit angrenzendem Fettgewebe. Klinisch-morphologische Kontrollen des Phänotyps unter besonderer Betrachtung der primären Geschlechtsmerkmale sowie die Befunde eines hCG-Stimulationstests 7 Monate nach Kastration des Katers festigten die Diagnose eines unilateralen Monorchismus. Ursache eines Monorchismus kann eine unilaterale testikuläre Agenesie oder eine Atrophie nach vaskulärem Insult sein. Dieser Fall zeigt, dass dem Praktiker auch bei Routineeingriffen wie einer Katerkastration seltene Anomalien wie ein Monorchismus begegnen können und dieser diagnostisch zuverlässig gegenüber einem Kryptorchismus abgesichert werden muss.

Abstract

In a 9-month-old tomcat presented for routine castration, only the right testis was palpable in the scrotum. This tomcat was part of an inbred litter. Unilateral cryptorchism was suspected, but further diagnostic procedures (ultrasound, diagnostic laparotomy) were unsuccessful in identifying a cryptorchid left testicle. Histopathologic evaluation of the resected right testis revealed a normal organ with spermatogenesis. In tissue resected from the subcutaneous tissue of the left inguinal region side during laparotomy, only a small left epididymis with surrounding fatty tissue was identified at the proximal end of the vas deferens. Morphologic controls of the phenotype and the remaining primary sexual characteristics as well as the results of a hCG stimulation test 7 months after the surgery further established the diagnosis of monorchism. Possible causes for monorchism are unilateral testicular agenesis and testicular atrophy because of vascular insults. This case shows that even during routine procedures, like tomcat castration, the general practitioner can encounter rare anomalies like monorchism, which must be differentiated from cryptorchidism by appropriate diagnostic procedures.

Schlüsselwörter

Einseitiger Anorchismus - Kastration - Kryptorchismus - hCG-Stimulationstest

Key words

Unilateral anorchism - neutering - cryptorchism - hCG stimulation test
 

  • Literatur

  • 1 Braga L, Kim S, Farrokhyar F. et al. Is there an optimal contralateral testicular cut-off size that predicts monorchidism in boys with nonpalpable testicles?. J Pediatr Urol 2014; 10 (04) 693-698
    CrossrefPubMedGoogle Scholar
  • 2 Burns G, Petersen N. Theriogenology Question of the Month. Unilateral anorchidism. J Am Vet Med Assoc 2008; 223 (10) 1553-1554
    PubMedGoogle Scholar
  • 3 Doxsee A, Yager J, Best S. et al. Extratesticular interstitial and Sertoli cell tumors in previously neutered dogs and cats: a report of 17 cases. Can Vet J 2006; 47 (08) 763-766
    PubMedGoogle Scholar
  • 4 Edelsztein N, Grinspon R, Schteingart H. et al. Anti-Müllerian hormone as a marker if steroid and gonadotropin action in the testis of children and adolescents with disorders of the gonadal axis. Int J Pediatr Endocrinol 2016; 2016: 20
    CrossrefPubMedGoogle Scholar
  • 5 England G, Heimendahl A. BSAVA Manual of Small Animal Reproduction and Neonatology. 2nd ed.. 2010
    Google Scholar
  • 6 Felumlee A, Reichle J, Hecht S. et al. Use of ultrasound to locate retained testes in cats and dogs. Vet Radiol Ultrasound 2012; 53 (05) 581-585
    CrossrefPubMedGoogle Scholar
  • 7 Garlick N. An unusual case of monorchidism in a stallion. J Am Vet Med Assoc 1952; 121 (905) 101-103
    PubMedGoogle Scholar
  • 8 Grinspon R, Habib C, Bedecarrás P. et al. Compensatory function of the remaining testis is dissociated in boys and adolescents with monorchidism. Eur J Endocrinol 2016; 174 (03) 399-407
    CrossrefPubMedGoogle Scholar
  • 9 Gunn-Moore D, Bessant C, Malik R. Breed-related disorders of cats. J Small Anim Pract 2008; 49 (04) 167-168
    CrossrefPubMedGoogle Scholar
  • 10 Hecht S, Matiasek K, Köstlin R. Die sonographische Untersuchung des Skrotalinhalts beim Hund unter besonderer Berücksichtigung testikulärer Neoplasien. Tieraerztl Prax Ausg K Kleintiere Heimtiere 2003; 31 (04) 199-210
    PubMedGoogle Scholar
  • 11 Hecht S. Male reproductive tract-Testicles. In: Penninck D, d´Anjou M. ed. Atlas of Small Animal Ultrasonography. Ames: Blackwell; 2008: 430-439
    Google Scholar
  • 12 Hodhod A, Capilicchio J, Jednak R. et al. Testicular hypertrophy as a predictor for contralateral monorchism: Retrospective review of prospectively recorded data. J Pediatr Urol 2016; 12 (01) 34
    PubMedGoogle Scholar
  • 13 Kogan S, Gill B, Bennett B. et al. Human monorchism: a clinicopathological study of unilateral absent testes in 65 boys. J Urol 1986; 135 (04) 758-761
    CrossrefPubMedGoogle Scholar
  • 14 Krauß Z, Krauß M. Magnetresonanztomographie und Laparaskopie zur Diagnose und Behandlung eines Ovarrest-Syndroms bei einer Hündin. Tieraerztl Prax Ausg K Kleintiere Heimtiere 2015; 43 (02) 111-114
    PubMedGoogle Scholar
  • 15 Kropp W, Ringert R, Hartung R. Dissociation of testis and epididymidis in incomplete descent. Urologe A 1985; 24 (02) 108-109
    PubMedGoogle Scholar
  • 16 Lamesch A. Monorchidism or unilateral anorchidism. Langenbecks Arch Chir 1994; 379 (02) 105-108
    PubMedGoogle Scholar
  • 17 Little S. Feline reproduction: Problems and clinical challenges. J Feline Med Surg 2011; 13 (07) 508-515
    CrossrefPubMedGoogle Scholar
  • 18 Memon M, Ganjam V, Pavletic M. et al. Use of human chorionic gonadotropin stimulation test to detect a retained testis in a cat. J Am Vet Med Assoc 1992; 201 (10) 1602
    PubMedGoogle Scholar
  • 19 Meyers-Wallen V. Gonadal and sex differentiation abnormalities of dogs and cats. Sex Dev 2012; 6: 46-60
    CrossrefPubMedGoogle Scholar
  • 20 Millis D, Hauptman J, Johnson C. Cryptorchidism and monorchidism in cats: 25 cases (1980–1989). J Am Vet Med Assoc 1992; 200 (08) 1128-1130
    PubMedGoogle Scholar
  • 21 Milwright R, Smith K. Polyorchidism in a cat. Vet Rec 1999; 145 (23) 679-680
    PubMedGoogle Scholar
  • 22 Palmer L, Gill B, Kogan S. Endocrine analysis of childhood monorchism. J Urol 1997; 158 (02) 594-596
    CrossrefPubMedGoogle Scholar
  • 23 Paradise D, Clark D. Supernummary kidney with ipsilateral cryptorchidism in a cat. J Am Anim Hosp Assoc 2013; 46 (05) 338-341
    PubMedGoogle Scholar
  • 24 Parker J, Rakestraw P. Intra-abdominal testicular torsion in a horse without signs of colic. J Am Vet Assoc 1997; 210 (03) 375-377
    PubMedGoogle Scholar
  • 25 Parks A, Scott E, Cox J. et al. Monorchidism in the horse. Equine Vet J 1989; 21 (03) 215-217
    CrossrefPubMedGoogle Scholar
  • 26 Petrizzi L, Varasano V, Robbe D. et al. Monorchidism in an appaloosa stallion. Vet Rec 2004; 155: 424-425
    CrossrefPubMedGoogle Scholar
  • 27 Ramareddy R, Alladi A, Siddappa O. Ectopic testis in children: experience with seven cases. J Pediatr Surg 2013; 48 (03) 538-541
    CrossrefPubMedGoogle Scholar
  • 28 Rocca-Ferrer J, Rodriguez E, Ramirez G. et al. A rare case of polyorchidism in a cat with four intra-abdominal testes. Reprod Domest Anim 2015; 50 (01) 172-176
    CrossrefPubMedGoogle Scholar
  • 29 Santschi E, Juzwiak J, Slone D. Monorchidism in three colts. J Am Vet Med Assoc 1989; 194 (02) 265-266
    PubMedGoogle Scholar
  • 30 Searle D, Dart A, Dart C. et al. Equine castration: review of anatomy, approaches, techniques and complications in normal, cryptorchid and monorchid horses. Aust Vet J 1999; 77 (07) 428-434
    CrossrefPubMedGoogle Scholar
  • 31 Stieve H. Entwicklung, Bau und Bedeutung der Keimdrüsenzwischenzellen: Eine Kritik der Steinachschen “Pubertätsdrüsenlehre”. Berlin: Springer; 1921
    CrossrefGoogle Scholar
  • 32 Stokowski S, Ruth J, Lanz O. et al. Computed tomographic features in a case of bilateral neoplastic cryptorchidism with suspected torsion in a dog. Front Vet Sci 2016; 3: 33
    PubMedGoogle Scholar
  • 33 Strong M, Dart A, Malikidis N. et al. Monorchidism in two horses. Aust Vet J 1997; 75 (05) 333-335
    CrossrefPubMedGoogle Scholar
  • 34 Vanelli M, Bernasconi S, Virdis R. et al. Unilateral monorchidism and cryptorchidism. Clinical and biological findings useful in the differential diagnosis. Arch Fr Pediatr 1983; 40 (04) 315-318
    PubMedGoogle Scholar