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Pseudolayering artefact on postcontrast magnetic resonance images of the bladder of 18 dogs and three cats

Department of Clinical Studies (Section of Radiology), University of Pennsylvania School of Veterinary Medicine, 3900 Delancey Street, Philadelphia, PA 19104-6101, USA

An artefact was observed on postcontrast magnetic resonance imaging (MRI) of the urinary bladder of several small animals; it took the form of a dark layer in the dependent (dorsal) part of the bladder, with a thin hyperintense layer on top of it, and a hypointense signal in the rest of the non-dependent (ventral) part. The MRI database was searched for animals with T₁-weighted images of the urinary bladder after the injection of gadolinium. Eighteen dogs and three cats were included in the study. The artefact was observed in 16 of the animals on the postcontrast images but not on the T₁-weighted and T₂-weighted precontrast images. A phantom experiment showed that the signal intensity observed on T₁-weighted images decreased rapidly as the concentration of gadolinium increased from 6·25 mmol/l to 25 mmol/l. It is hypothesised that the early excretion of concentrated gadolinium into the bladder causes the pseudolayering artefact observed, which has also been reported in human patients.