A 6-year-old male neutered cat presented with blindness, lethargy, polydipsia, hyposthenuria and severe hypernatraemia. Central diabetes insipidus was demonstrated by means of a low measured anti-diuretic hormone (ADH) concentration in the face of hypernatraemia, and clinical response to supplementation with desmopressin. Magnetic resonance imaging of the brain showed a discrete mass in the region of the hypothalamus. The cat was euthanased and post-mortem histological examination demonstrated B cell lymphoma involving the brain, optic nerves, urinary bladder wall and diaphragm. To the authors' knowledge, this case report is the first to describe central diabetes insipidus caused by central nervous system lymphoma in the cat.

Thorough preoperative planning with Doppler ultrasonography, contrast angiography, and blood gas analysis is recommended when attempting surgical correction of these malformations in horses. Surgical ligation can result in a successful cosmetic and functional outcome.

A case of granulomatous amoebic meningoencephalitis in a previously healthy, mature, apparently immunocompetent dog, with a history of exposure to stagnant water, is reported. The case presented with ataxia and a tendency to fall to the left side. A computed tomography (CT) showed a ring-enhancing lesion within the cerebellum; an examination of cerebrospinal fluid (CSF) revealed nonspecific mixed-cell pleocytosis. Despite antibiotic and anti-inflammatory therapy, clinical signs progressed rapidly to decerebellate rigidity over 4 days, and the dog was euthanased. Significant post-mortem findings were restricted to the brain, with a localised lytic lesion in the deep cerebellar white matter. Histopathological examination of the brain showed focally extensive cavitation of the white matter and communication of the lesion with the fourth ventricle. The affected area contained structures consistent with amoebae and was infiltrated by neutrophils mixed with lower numbers of macrophages, plasma cells and lymphocytes. The amoebae were identified as Balamuthia mandrillaris, based on specific immunofluorescence detection. Amoebic meningoencephalitis should be considered in dogs with evidence of focal cavitary lesions in the brain, particularly in cases with a history of swimming in stagnant water.

This case report describes neurological signs associated with a pyogranulomatous lesion within the sacral vertebral canal of a horse. The clinical findings included urinary overflow incontinence and reduced anal, perianal and tail tone. The horse failed to respond to medical management and a guarded prognosis for return to athletic performance initiated the decision for euthanasia.

A 9-year old female spayed Boston Terrier was found to have a bee stinger in the left metacarpal pad and subsequently collapsed. Treatment for anaphylaxis was initiated. Haemoperitoneum was diagnosed by abdominal focussed assessment with sonography for trauma (AFAST) and abdominocentesis. Computed tomography revealed extravasation of contrast medium indicating active haemorrhage. Exploratory coeliotomy and liver lobectomy were performed as there was concern by the attending clinicians that an underlying liver mass may be present due to evidence of active haemorrhage. Histopathology reported marked, acute, multifocal centrilobular and portal haemorrhage with no concurrent underlying pathology such as neoplasia. Subsequent interpretation of the CT by a boarded radiologist reported no clear cause for the haemorrhage. The multifocal extravasation of the contrast medium suggested a multifocal or diffuse haemorrhagic process. Vasculitis and coagulopathy secondary to bee-sting was concluded. The dog recovered and follow-up ultrasound 9 weeks later was unremarkable, supporting a one-off event.