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Updated: Feb 22, 2026

Preparation of Mouse Pituitary Immunogen for the Induction of Experimental Autoimmune Hypophysitis
Published on: December 17, 2010
IgG4-related Hypophysitis with Subtle Hypopituitarism in an Elderly Diabetic Patient: Is Treatment or Observation
Motoki Kawasaki1, Motoyoshi Tsujino1, Fuminori Sato1
1Department of Endocrinology and Metabolism, Tokyo Metropolitan Tama Medical Center, Japan.
Abstract:
A 70-year-old man with diabetes mellitus presented with an enlarged pituitary stalk in 2014. IgG4-related parotitis and submandibular sialoadenitis were diagnosed in 2012. He denied any symptoms related to a pituitary mass. His visual field was intact, and his hypopituitarism was subtle. The serum IgG4 level was elevated. A lip biopsy revealed strong fibrosis and hyper-infiltration of IgG4-positive plasma cells. Based on these findings, IgG4-related hypophysitis was diagnosed. The patient was carefully followed without specific intervention. His clinical condition showed no change until December 2016, suggesting a stable, natural course. Care should be taken when considering glucocorticoid therapy, especially for elderly diabetic patients, given possible side effects.
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