Pituitary involvement of langerhans cell histiocytosis in an adult unveiled by FDG PET/CT.

A 39-year-old woman with complains of polydipsia and dieresis was admitted to endocrinology service for evaluation and potential treatment of diabetes insipidus. During the hospitalization, the patient was found to have unexplained fever, for which an FDG PET/CT was performed to explore the source. The images revealed multiple regions of abnormal hypermetabolism throughout the body. Notably, there was an intense activity in the region of pituitary stalk. Pathological results after biopsy showed pituitary involvement of Langerhans cell histiocytosis.