title: Fortuitous detection of pseudoaneurysm by three-phase bone scan.
abstract: We report the diagnosis of an unsuspected pseudoaneurysm in the lower extremity when 3-phase bone scan was used to evaluate a presumed malignancy. We confirmed the diagnosis with duplex ultrasonography and angiography. Although the primary diagnostic modality for detection of pseudoaneurysm remains duplex sonography, the nuclear medicine practitioner should be vigilant for characteristic presentation of a pseudoaneurysm on a 3-phase bone scan, an area of increased radiotracer activity on blood-flow and blood-pool images that becomes a photopenic area on delayed images. This also underscores the need to consider benign vascular lesions in the differential diagnosis of abnormal 3-phase bone scans for presumed tumors.
authors.affiliation: Department of Radiology, University of Texas Southwestern Medical Center-Dallas, Dallas, TX 75390, USA.
authors.forename: Z Unsal
authors.initials: ZU
authors.lastname: Coskun
authors.forename: Charles E
authors.initials: CE
authors.lastname: Stewart
authors.forename: Martin
authors.initials: M
authors.lastname: Robinson
authors.forename: Gene
authors.initials: G
authors.lastname: Beisert
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Rivera
authors.forename: Orhan K
authors.initials: OK
authors.lastname: Oz
mesh_terms: D017541:Aneurysm, False / Q000000981:diagnostic imaging*; D006801:Humans; D033162:Incidental Findings; D007866:Leg / Q000098:blood supply* / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D013669:Technetium Tc 99m Medronate / Q000031:analogs & derivatives*
chemical_list: D019275:Radiopharmaceuticals; C024226:technetium Tc 99m hydroxymethylene diphosphonate; D013669:Technetium Tc 99m Medronate