title: Constipation causing elevated iodine activity in the rectum mimicking thyroid cancer metastases.
abstract: Iodine activity in the gastrointestinal tract on I or I imaging is usually diffuse and easy to recognize. Hereby we describe 2 cases of intense focal iodine activity in the rectum mimicking sacral metastases that were caused by constipation. Careful history taking and SPECT/CT imaging can be helpful in distinguishing rectal activity from metastatic lesions in such situations.
authors.affiliation: *Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, People's Republic of China; and †Department of Radiology, Children's Hospital of Philadelphia, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA.
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Summer L
authors.initials: SL
authors.lastname: Kaplan
authors.forename: Hua
authors.initials: H
authors.lastname: Yang
authors.forename: Ion
authors.initials: I
authors.lastname: Codreanu
authors.forename: Hongming
authors.initials: H
authors.lastname: Zhuang
mesh_terms: D000293:Adolescent; D003248:Constipation / Q000000981:diagnostic imaging*; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes; D064847:Multimodal Imaging; D011868:Radioisotopes; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D015899:Tomography, Emission-Computed, Single-Photon; D014057:Tomography, X-Ray Computed; D055815:Young Adult
chemical_list: D007457:Iodine Radioisotopes; D011868:Radioisotopes