Diabetes insipidus on MRI
Loading Stack -
0 images remaining
This contrast enhanced dynamic MR shows an absent posterior pituitary bright spot on the pre-enhanced T1WI.
The MR also shows a thick (3.8 mm, normal is < 2.4 mm), but normally enhancing pituitary stalk.
In absence of any other biochemical finding or significant clinical history- one would consider autoimmune disorder as the likely cause.
1 case question available
There are several causes of central diabetes insipidus (DI). MR is done to try and find out the cause of central DI. The presence of a thickened pituitary stalk in this case points towards possibility of either inflammatory or autoimmune hypophysitis. When the inflammation is limited to the posterior pituitary the condition may be termed as infudibuloneurohypophysitis. If the anterior pituitary is also involved (not seen in this case) the condition may be termed as infundibuloihypophysitis (dropping the term "neuro"). Such kind of global involvement of the pituitary is seen in lymphocytic hypophysitis,
Although final cause of the pituitary stalk inflammation could not be established in this case, however, the MR images serves to demonstrate the prudent approach to a patient with DI (central DI).
- MR Imaging of Central Diabetes Insipidus: A Pictorial Essay ( Ji Hoon Shin, MD,1 Ho Kyu Lee, MD,corresponding author1 Choong Gon Choi, MD,1 Dae Chul Suh, MD,1 Chang Jin Kim, MD,2 Sung Kwan Hong, MD,3 and Dong Gyu Na, MD4 Copyright and License information ► This article has been cited by other articles in PMC.) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2718125/