Journal of Feline Medicine and Surgery Open Reports最新文献

Case summary: A 5-year-old female spayed domestic shorthair cat presented for sudden onset vision loss 3 days after a dental procedure. Bilateral blindness was confirmed on ocular examination, with fundoscopy revealing segmental wedge-shaped areas of retinal oedema and partial non-rhegmatogenous retinal detachments. An initial differential diagnosis included angioinvasive pulmonary carcinoma, based on previously reported fundoscopy images of this condition; however, general physical examination, blood pressure and chest radiographs were all normal. Four weeks after initial presentation, fundoscopy revealed the resolution of the retinal detachments; however, bilateral segmental chorioretinal necrosis was present. The cat regained some vision and remained well 13 months after the initial presentation. Considering the clinical findings, the onset of blindness after a lengthy dental procedure and improvement of vision over time, a diagnosis of pulmonary carcinoma was unlikely and instead a diagnosis of chorioretinal ischaemia secondary to maxillary artery blood flow restriction is proposed.

Relevance and novel information: Maxillary artery blood flow restriction has been well documented with varying degrees of jaw opening in cats. Presumed central blindness as a result of this blood flow restriction has also been documented. However, to the authors' knowledge, vision loss due to retinal changes, documented by fundoscopic images and their progression over time following suspected chorioretinal ischaemia after a dental procedure, have not previously been reported. We propose that temporary occlusion of the maxillary artery can result in segmental chorioretinal necrosis and associated blindness in cats. This finding further supports the recommendation to minimise prolonged jaw opening during surgical procedures in cats.

[This corrects the article DOI: 10.1177/20551169231213499.].

Case summary: A 2-year-old female spayed domestic shorthair cat was presented for evaluation of severe thickening of the proximal duodenum identified on abdominal ultrasound after a 1-year history of vomiting. At surgery, a proximal duodenal mass encompassed the areas of the major and minor duodenal papillae. A gastrojejunostomy was performed to bypass the proximal duodenum and maintain the integrity of the major duodenal papilla. Histopathology revealed changes consistent with feline eosinophilic sclerosing fibroplasia. The cat was treated with prednisolone and survived for 2.5 years. It was euthanized for bronchopneumonia.

Relevance and novel information: This case report describes a surgical approach for cats with lesions involving the pylorus and proximal duodenum. Gastrojejunostomy provided a therapeutic option that preserved exocrine pancreatic and biliary secretion in this cat.

Case summary: A 12-year-old male castrated domestic shorthair cat exhibited right Horner's syndrome, right facial nerve paresis, difficulty swallowing, coughing, gait abnormalities and weight loss. Despite prior unspecific treatment by a primary care veterinarian with cortisone and antibiotics, the cat's condition worsened, culminating in tetraparesis and right hemispasms. Imaging studies, including CT and MRI, identified a mass extending from the carotid body into the neurocranium, causing displacement of adjacent brain structures and meningeal contrast uptake. Histopathology confirmed a malignant B-cell lymphoma. Differential diagnoses are explored, with a particular focus on carotid body tumours, which originate from the chief cells of the carotid body. These neoplasias are rare in non-human primates, dogs, cats and horses, possibly influenced by genetic predisposition and environmental factors such as hypoxia.

Relevance and novel information: Carotid body tumours are rare in cats, as they are in other animal species. Although lymphomas are the most common feline neoplasms, to our knowledge, no previous case of a B-cell lymphoma in the carotid body has been described in the feline species to date. This case underscores the importance of considering rare and common neoplastic entities in feline patients with atypical clinical presentations and locations. Thereby highlighting the diagnostic challenges in veterinary oncology.

Case summary: This report describes a case of gastric mucormycosis in a young Ragdoll cat with a 5-day history of vomiting. Physical examination detected mild dehydration and tenderness was elicited on abdominal palpation. The results of blood work-up and radiographic study were unremarkable; however, abdominal ultrasonographic examination revealed multiple hyperechoic neoformations at the level of the pyloric antrum, which were confirmed on endoscopic examination. Non-septate hyphae of irregular diameter with a branched appearance were observed on cytology, and histological examination revealed severe diffuse necrotising and granulomatous gastritis with the presence of intralesional fungal hyphae indicative of mucormycosis, which was confirmed by PCR tests. Antifungal therapy with ketoconazole in addition to supportive treatment temporarily improved the clinical condition. Lethargy, fever and abdominal effusion developed in the following days. Cytological examination of abdominal fluid was compatible with septic peritonitis and, given the severity of the condition, euthanasia was opted by the owners. Post-mortem examination confirmed septic peritonitis resulting from perforation of the gastric wall at one of the neoformations of the pyloric antrum.

Relevance and novel information: To the authors' knowledge, this is the first reported case of gastric mucormycosis in a cat. Previous literature includes a case of mucormycosis in a Persian cat affecting only the duodenum. In both the Persian cat and the cat described here, gastrointestinal mucormycosis disease progressed rapidly and was fatal.

Case summary: A 9-year-old male castrated domestic shorthair cat from northern California was evaluated for a 12-month history of dermal and subcutaneous dermatitis in the inguinal region. Histopathologic examination of a biopsy revealed severe, chronic, multifocal to coalescing pyogranulomatous dermatitis and panniculitis, accompanied by ulceration and central necrosis. Aerobic bacterial culture of lesions yielded mycobacterial growth. Empiric antimicrobial therapy was initiated with doxycycline and marbofloxacin pending culture and susceptibility. Culture of a biopsy followed by rpoB gene sequencing at a mycobacterial reference laboratory yielded Mycobacterium porcinum after 6 weeks. Ten months after initial antimicrobial administration, the lesions resolved.

Relevance and novel information: To date, in cats, M porcinum panniculitis has been reported from Ohio, Massachusetts and British Columbia in North America; two additional cases were reported from southeastern Australia. In humans, M porcinum infections have been reported from several states in the USA, predominantly in the Midwest and coastal south, but not from the west. This report extends the known spatial distribution of M porcinum to the western USA and strengthens its association with panniculitis in cats. It also demonstrates the need for prolonged incubation for diagnosis of some rapidly growing mycobacteria infections using culture.

Case summary: A 13-year-old male castrated domestic shorthair cat presented with a 2-month history of progressive lameness, poor appetite and constipation. Physical examination revealed palpable lesions in muscles of several extremities. Ultrasound examination confirmed the presence of round lesions with a hypo- or anechoic centre within the muscles. These lesions were characterised by an anechoic, occasionally trabeculated, central area surrounded by a hyperechoic band with heterogeneous echotexture. In total, seven lesions affecting six appendicular muscles were detected in different evolution stages, as suggested by their sizes and ultrasonographic features. Fine-needle aspiration of the muscle lesions revealed nests and isolated pleomorphic large neoplastic cells consistent with a carcinoma (vs sarcoma) and one mass was surgically removed. The histological and immunohistochemical studies confirmed a diagnosis of metastatic urothelial carcinoma. Although this neoplasia typically originates from the urothelium of the urinary bladder or renal pelvis, the primary tumour could not be detected in repeated abdominal ultrasound examinations. The cat was euthanased and further evaluations were declined by the author.

Relevance and novel information: Urothelial carcinoma is a rare and highly aggressive neoplasia in the cat. While metastasis to regional lymph nodes and lungs are common in cats and dogs, to the authors' knowledge, there have been no reports of metastasis to multiple appendicular muscles in cats. This clinical presentation should be considered in the differential diagnoses of multiple nodular or cystic lesions affecting long muscles in cats.

Case series summary: Two cats were initially evaluated for recurrent dysuria and haematuria, which were unresponsive to antibiotic and anti-inflammatory treatments. An abdominal ultrasound revealed focal wall thickening with a severe hypoechoic multicystic parietal lesion at the bladder apex. Surgical excision of the lesion (apical cystectomy) led to complete resolution of the clinical signs in both cases. The histological findings were consistent with large cystic von Brunn's nest hyperplasia, along with foci of small glandular metaplasia. Urine and tissue cultures were negative. Cystitis cystica was diagnosed. No recurrence was reported within 2 years of surgery in both cases.

Relevance and novel information: This case series illustrates the occurrence and ultrasonographic features of a type of cystitis rarely described in animals: cystic cystitis with von Brunn's nest hyperplasia. These lesions result from chronic irritation and can lead to recurrent cystitis if not excised. Cystic cystitis has previously been described histologically in cats. To the authors' knowledge, this is the first report of macroscopic apical cystic cystitis with pre-treatment ultrasound diagnosis. Surgical resection of the hyperplastic von Brunn's nests appeared to be curative in both cases.

Case summary: A 1-year-old spayed female domestic British Shorthair cat was presented for facial trauma; there were multiple mandibular fractures involving the right temporomandibular joint (TMJ) that were managed conservatively. After 2 months, the owner reported a gradual onset of the cat's inability to open its mouth and subsequent inappetence. The maximum mouth opening (MMO) measured 7 mm. CT showed ankylosis of the TMJ, and surgical treatment with caudal segmental mandibulectomy (CSM) was performed. The cat had a rapid postoperative recovery and returned promptly to spontaneous eating, with a nearly normal MMO of 33 mm. A CT scan performed 3 months postoperatively showed a mild rightward deviation of the mandible, and a clearly visible non-ossified ostectomy gap between the body and the ramus of the right mandible. The cat continued to eat spontaneously without dysphagia following surgery and was asymptomatic 1 year postoperatively.

Relevance and novel information: To the authors' knowledge, this is the first report describing the tomographic findings after CSM, as compared with the clinical outcome. Postoperative CT is indicated to confirm the success of the procedure and to assess TMJ ankylosis sequalae or complications of the CSM surgical site at an early stage. This report confirmed the effectiveness of CSM in resolving TMJ stiffness due to articular fractures or ankylosis with a good clinical and tomographic outcome.