Magnetic Resonance Imaging of Brain Involvement in Dogs Using Paramagnetic Contrast Enhancement with Mn(II)-DCTA P

Area of Science:

• Veterinary Neurology
• Medical Imaging
• Nanotechnology

Background:

• Babesia canis infection can cause severe central nervous system (CNS) involvement in dogs.
• Accurate visualization of CNS lesions is crucial for diagnosis and treatment.
• Existing contrast agents may have limitations in detecting focal CNS injuries.

Purpose of the Study:

• To evaluate the efficacy of a novel paramagnetic complex, Mn-DCTA (Cyclomang), as a contrast agent for magnetic resonance imaging (MRI) in dogs with CNS Babesia canis infection.
• To assess the safety and diagnostic potential of Mn-DCTA for visualizing CNS lesions.

Main Methods:

• An experimental study was conducted using a 0.5 M manganese (II) solution with trans-1,2-diamine cyclohexane-N,N,N',N'-tetraacetic acid (Mn-DCTA).
• The contrast agent was administered to dogs with severe Babesia canis infection and subsequent CNS involvement.
• MRI was performed to visualize CNS injuries, with quantitative evaluation of paramagnetic accumulation in affected areas.

Main Results:

• Mn-DCTA successfully visualized CNS injuries in all affected dogs, with intense contrast enhancement.
• Higher paramagnetic accumulation was observed at the periphery (1.47±0.17) compared to central areas (1.19±0.11) of the lesions.
• The pituitary gland and vascular plexuses of the lateral ventricles were also effectively contrasted.
• No pathological or physiological reactions were observed following Mn-DCTA injection.

Conclusions:

• Mn-DCTA serves as an effective paramagnetic contrast agent for MRI visualization of focal CNS injuries in dogs.
• The agent demonstrates potential for diagnosing brain injuries associated with Babesia canis infection.
• Mn-DCTA exhibits a favorable safety profile in canine subjects.