Magnetic Resonance Imaging Assessment of Pituitary Posterior Lobe Displacement in Dogs with Pituitary-Dependent Hyperadrenocorticism

概要

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The displacement and signal intensity (SI) of the pituitary posterior lobe were evaluated on T1 weighted magnetic resonance (MR) images in 28 dogs with pituitary dependent hyperadrenocorticism (PDH). Compared with normal dogs, the posterior lobe was displaced dorsally in the pituitary of the PDH dogs. Correlation between the pituitary height/brain area (P/B) ratio and the displacement of the posterior lobe in the PDH dogs suggests that dorsal displacement of the posterior lobe increases in accordance with enlargement of the pituitary. As to the SI of the posterior lobe, the PDH dogs showed significantly lower SI in comparison to the normal dogs. Taken together, these results suggest that assessment of the displacement and SI of the posterior lobe of the pituitary on T1-weighted MR images are useful for the diagnosis of pituitary adenoma. In pituitary microadenoma that presented no apparent tumorigenesis on MRI, the evaluation of these values may be useful for the diagnosis and selection of appropriate therapy.