[Peripheral keratinizing ameloblastoma in a dwarf rabbit (Oryctolagus cuniculus f. dom.)]. / Peripheres keratinisierendes Ameloblastom bei einem Zwergkaninchen (Oryctolagus cuniculus f. dom.).

A 3.5-year-old, male, neutered dwarf rabbit was presented with a history of a fast-growing gingival mass at the maxilla. The neoplasm was surgically completely excised. Histopathologically, an expansively growing, multilobulated, partially cystic, peripheral, keratinizing ameloblastoma was diagnosed. The immunohistochemical phenotyping of the tumour cells resulted in cytoplasmic labelling with various pan-cytokeratin antibodies. The cytokeratins 5/6, 7, 10 and 14 were expressed variably. Cytokeratin 20 was not detected. Vimentin was expressed in the cytoplasm of mesenchymal cells of the tumour stroma. In addition, in the nuclei of approximately 10% of the tumour cells the protein of the tumour suppressor gene p53 was expressed while in approximately 5% the proliferation marker Ki67 was expressed. Odontogenic tumours should be considered as a differential diagnosis of oral masses in rabbits.

Treatment of gastric dilatation-volvulus and a rapid method for prevention of relapse in dogs: 134 cases (1988-1991)

During a 3.3-year period, gastric dilatation-volvulus was diagnosed in 134 dogs. Thirteen of them died or were euthanatized prior to treatment. In 33 dogs, decompression and emptying of the stomach was successfully performed via a gastric tube. Rate of recurrence was 75.8% (25/33) for these dogs. Eighty-eight dogs were treated surgically. In all but 1 surgically treated dog, a new technique for gastropexy was performed for prevention of relapse. For the 5-cm-long gastropexy, the pyloric antrum was incorporated in the cranial suture of the abdominal wall. Of the surgically treated group, 63 dogs (79.7%) were discharged from the clinic in good condition. Recurrence of gastric dilatation, without evidence of gastric volvulus, 2 (n = 3) and 6 (n = 1) months after surgery, was observed in 6.6% (4/61) of surgically treated dogs with gastric dilatation-volvulus. Four (6.6%) of the 61 dogs died or were euthanatized because of other causes, but had been without signs of gastric dilatation within a mean of 19 months after surgery. In the remaining 53 dogs (86.8%), relapse had not been observed by the end of the follow-up period. In dogs with surgical treatment of gastric dilatation-volvulus, recurrence rate (6.6%) was significantly (P < 0.0001) different from that in those with medical treatment (75.8%). This study indicated that recurrence of gastric dilatation-volvulus may be prevented with this simple and fast gastropexy technique.

Ultrasonographic monitoring of follicular development, ovulation and the early luteal phase in the bitch.

Follicular development, ovulation and the early luteal phase in 15 oestrous cycles of 13 individual bitches were monitored daily by ultrasonography using a 7.5 MHz sector scanner transducer. These findings were compared with vaginal cytology and changes in the peripheral plasma concentrations of oestradiol, luteinizing hormone (LH) and progesterone. Both ovaries were imaged throughout the period of study. Follicles were identified as anechoic spherical structures as early as day 1 of pro-oestrus in two cases and on days 3-4 in 13 cases. The average follicular size increased from 3.7 +/- 0.6 mm to 6.9 +/- 0.7 mm (P < 0.001) between day -5 and the LH surge (day 0). The anechoic structures then increased in size to 7.5 +/- 0.7 mm (P < 0.05) until day 2 after the LH surge; their diameters continued to increase during corpus luteum development, up to 8.1 +/- 0.6 mm (P < 0.001) on the first day of dioestrus. The average number of follicles counted imaged on the day of the LH surge was 3.3 +/- 0.4 on the left ovary and 3.7 +/- 0.7 on the right ovary. The rapid disappearance of the anechoic antrum, corresponding to ovulation, was detected in only two bitches. In the remaining cases follicular rupture was not detected; however, starting at the LH surge, a gradual thickening of the antral wall occurred. This corresponded to a progressive obliteration of the anechoic region and was characteristic of the postovulatory corpora lutea. These changes led to a significant decrease (P < 0.05) in the number of anechoic structures to 2.4 +/- 0.5 on the left ovary and 3.3 +/- 0.5 on the right ovary by day 1 of dioestrus. During the follicular phase, the mean increase in oestradiol concentration was correlated with follicular size (P < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)

[Nerve disorders of micturition in the dog. A review of five cases]. / Nervale Miktionsstörungen beim Hund. Eine Ubersicht anhand von fünf Fallbeispielen.

This investigation gives an overview of the etiology and treatment of neural micturition disorders, using five clinical cases. Micturition is only feasible when there is an unimpeded collaboration between superior control mechanisms and peripheral reflex mechanisms. Due to the complex physiology of bladder innervation, the loss of individual nerve paths leads to disorders in the chronological events of urine emission. The purpose of the present work is to demonstrate the symptoms and physiopathological principles which were found to be present in specially selected and typical clinical cases. It should be borne in mind that the evaluation of the etiology of this commonly occurring paralysis is not always as clear as it was in these selected cases.