Ultrasonographic detection of meningoencephalitis in a dog

The aim of this report is to disseminate ultrasound findings of meningoencephalitis in a dog, diagnosed by analysis of cerebrospinal fluid collected by guided-ultrasound puncture. The patient presented walking in circles, absence of bilateral threat reflex, decreased left eyelid reflex, divergent strabismus of the right eye, negative nasal sensation on the right side, and an increase in volume of skullcap with the presence of open fontanelle. The clinical suspicion was hydrocephalus and/or inflammatory/infectious disease. The distemper rapid test was negative. The hematological profile showed an increase in alanine aminotransferase enzyme. Ultrasound examination was performed with patient in sternal decubitus, using a linear transducer (9.0 MHz). Images were obtained in longitudinal and transverse sections through the temporal windows and bregmatic fontanelle. The presence of a marked anechogenic content with moderate amount of floating hyperechogenic spots was observed, with retraction and increased echogenicity of the brain. Cerebrospinal fluid was collected using the bregmatic fontanelle for ultrasound-guided puncture, under general anesthesia. Meningoencephalitis was indicated by mononucleated cells and red blood cells founded in cerebrospinal fluid analysis. However, the patient not return to start treatment and investigate the cause of the meningoencephalitis.