We report a case of possible
immunoglobulin G4-related disease(IgG4-RD)that resulted in complications such as
retroperitoneal fibrosis and infundibulohypophysitis. The patient was a 72-year-old male who presented with
polyuria and
polydipsia. Magnetic resonance imaging(MRI)revealed a thickened pituitary stalk and contrast enhancement with
gadolinium. T1-weighted imaging revealed that the posterior pituitary high-signal zone had disappeared.
Central diabetes insipidus was diagnosed on the basis of results of the hypertonic saline test. In addition, pressure due to
retroperitoneal fibrosis resulted in
hydronephrosis and elevated serum
IgG4 levels. Because it was determined that the patient could have
IgG4-RD, he was administered
prednisolone, following which a decrease in the size of the pituitary stalk and
retroperitoneal fibrosis was observed.
IgG4-RD is characterized by elevated serum
IgG4 levels and the infiltration of IgG4-positive plasma cells into various organs, including the central nervous system. Recently,
IgG4-RD research teams organized by the Ministry of Health, Labour and Welfare established guidelines for the diagnosis of
IgG4-RD. According to these guidelines, this case would fall under the category of "possible
IgG4-RD." This case suggested that when infundibulohypophysitis is detected by neuroradiology, further investigation into the possibility of
IgG4-RD should be recommended.