title: Fluorine-18 deoxyglucose uptake in sarcoidosis measured with positron emission tomography.
abstract: Regional pulmonary glucose metabolism (MRglu; mumol h-1 g-1), extravascular lung density (D(EV); g cm-3) and vascular volume (VB; ml cm-3) were measured in a single midthoracic transaxial slice (approximately 2 cm thick) using position emission tomography (PET) in seven patients with histologically proven sarcoidosis. The measurements were repeated 1-7 months later after steroid therapy (in two cases, no treatment) in order to assess MRglu as an index of inflammation and relate it to routine pulmonary function tests, chest radiography and serum angiotensin converting enzyme (SACE) levels. MRglu was computed from serial lung scans and peripheral venous blood samples for 60 min following an i.v. injection of 18F-2-fluoro-2-deoxy-D-glucose (18FDG). Both MRglu (which was increased in six of seven patients) and elevated SACE levels returned to normal in those patients treated with high-dose steroids. Regional vascular volume was normal in six of seven cases and did not change significantly with therapy. The high tissue density measured in all patients decreased significantly in two of three patients treated with 40 mg prednisolone daily. The abnormal MRglu observed in active sarcoidosis becomes normal pari passu with SACE levels during high-dose steroid therapy. We conclude that MRglu measured with 18FDG and PET may reflect "disease activity" in sarcoidosis in quantitative terms (per gram lung tissue) and in respect of disease distribution.
authors.affiliation: MRC Cyclotron Unit, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.
authors.forename: L H
authors.initials: LH
authors.lastname: Brudin
authors.forename: S O
authors.initials: SO
authors.lastname: Valind
authors.forename: C G
authors.initials: CG
authors.lastname: Rhodes
authors.forename: C F
authors.initials: CF
authors.lastname: Pantin
authors.forename: M
authors.initials: M
authors.lastname: Sweatman
authors.forename: T
authors.initials: T
authors.lastname: Jones
authors.forename: J M
authors.initials: JM
authors.lastname: Hughes
mesh_terms: D000328:Adult; D003847:Deoxyglucose / Q000031:analogs & derivatives*; D005260:Female; D005462:Fluorine Radioisotopes; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging* / Q000378:metabolism; D008297:Male; D011239:Prednisolone / Q000627:therapeutic use; D017565:Sarcoidosis, Pulmonary / Q000000981:diagnostic imaging* / Q000188:drug therapy; D014055:Tomography, Emission-Computed
chemical_list: D005462:Fluorine Radioisotopes; D019788:Fluorodeoxyglucose F18; D003847:Deoxyglucose; D011239:Prednisolone