An American cocker spaniel with a long-term history of chronic otitis externa was referred to our educational veterinary hospital for malar abscess and the mass formation in exteranal ear canal. CT examination revealed the lesion occupying the right external and middle ear and bone lysis of the tympanic bulla. Since an epithelium tumor was suggested by needle biopsy, a total ear canal ablation with lateral bulla osteotomy was performed. Ultrasonic osteotome was used for the osteotomy. Prognosis of the patient was excellent. In this case, chronic otitis externa triggered the tumorigenesis, and a chronic suppurative otitis media with the bone lysis of the tympanic bulla and malar subcutaneous abscess with the fistulation occurred as the result.

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A six-year-old male intact Pomeranian showed swelling of the right perineal area. Based on the ultrasound examination, the case was tentatively diagnosed as a perineal hernia with large amount of fluid content. After the routine surgical approach to perineal hernia, large cyst was found as a hernia content, and after the incision of the cyst wall, abundant fluid was drawn. Since the surgical specimen from the cyst wall was characterized by connective tissue growth with fibrosis and mineralization histopathologically, the cyst was diagnosed as a paraprostatic cyst. It is rare that the contents of the perineal hernia to be a paraprostatic cyst. This case suggested that a paraprostatic cyst should be considered as a differential diagnosis of hernia contents.

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A female 11-year-old Shiba was referred to Animal Medical Center of Yamaguchi University with frequent vomiting lasting for two months. The dog lost weight (body condition score: 3/9) at the first admission. Abdominal computed tomography revealed severe stomach extension and thickening of the stomach wall of the pylorus. Under an endoscopic examination, a pyloric mass was identified and endoscopic biopsy of the mass was strongly suggestive of gastric adenocarcinoma. After two weeks of medical management of the dog, surgical removal of the pyloric mass was performed. One-third of distal stomach containing the pyloric mass, as well as 15 mm of duodenum proximal to common bile duct opening, were surgically removed, and after that gastroenterostomy with Billroth II was performed. The histopathological diagnosis of the mass was gastric adenocarcinoma without lymphatic metastasis. No clinical recurrence or postoperative complications has been observed for 7 months after operation. This case suggested that aggressive surgical treatment were important for improvement in quality of life of canine gastric adenocarcinoma cases with no metastatic lesion at preoperative examination.

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