title: Gagel's granuloma (localized Langerhans cell histiocytosis) in the pituitary stalk.
abstract: A 46-year-old man with diabetes insipidus, hypothyroidism and hypocortisolism was found to have a tumor of the pituitary stalk. After transsphenoidal resection of the tumor substitution of cortisol and thyroxin was necessary. Pathological examination of the lesion revealed an extremely rare granulomatous infiltration classified as Gagel's granuloma (Langerhans' cell histiocytosis). Pre- and postoperative magnetic resonance imaging (MRI) studies, differential diagnosis and treatment of such lesions are presented.
authors.affiliation: Neurosurgical Department, Knappschaftskrankenhaus Bochum-Langendreer, Ruhr-University Bochum, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Scholz
authors.forename: R
authors.initials: R
authors.lastname: Firsching
authors.forename: W
authors.initials: W
authors.lastname: Feiden
authors.forename: H
authors.initials: H
authors.lastname: Breining
authors.forename: D
authors.initials: D
authors.lastname: Brechtelsbauer
authors.forename: A
authors.initials: A
authors.lastname: Harders
mesh_terms: D003919:Diabetes Insipidus / Q000150:complications; D003937:Diagnosis, Differential; D006646:Histiocytosis, Langerhans-Cell / Q000150:complications / Q000175:diagnosis* / Q000473:pathology*; D006801:Humans; D007037:Hypothyroidism / Q000150:complications; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010902:Pituitary Gland / Q000473:pathology* / Q000648:ultrastructure