RT Journal Article SR Electronic T1 18F-FDG PET/CT Imaging Features of IgG4-Related Pulmonary Inflammatory Pseudotumor at Initial Diagnosis and During Early Treatment Monitoring JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 207 OP 209 DO 10.2967/jnmt.115.168450 VO 44 IS 3 A1 Basu, Sandip A1 Utpat, Ketaki A1 Joshi, Jyotsna YR 2016 UL http://tech.snmjournals.org/content/44/3/207.abstract AB We present a proven case of pulmonary inflammatory pseudotumor that illustrates the 18F-FDG PET/CT imaging features of this “great mimicker of malignancy” both at initial diagnosis and during early monitoring of corticosteroid therapy, which is advocated as the first-line treatment. Although the patient showed some symptomatic response to corticosteroid therapy, as well as a modest reduction in SUVmax, complete surgical resection was eventually needed in view of the relative nonresponse. 18F-FDG avidity in untreated cases of pulmonary inflammatory pseudotumor has been quite characteristic and may potentially be used to evaluate early response of this IgG4-related disease to nonsurgical treatment and to detect residual disease or recurrence after therapeutic intervention.