title: T1 pseudohyperintensity on fat-suppressed magnetic resonance imaging: a potential diagnostic pitfall.
abstract: Magnetic resonance imaging findings in 2 patients with misleading T1 hyperintensity seen only on fat-suppressed images are presented; one with a renal cell carcinoma that was misinterpreted as a hemorrhagic cyst and the other with an ovarian serous cystadenocarcinoma that was misinterpreted as a complicated endometrioma. The apparent T1 hyperintensity on fat-suppressed images in these cases was likely due to varying perception of image signal dependent on local contrast, an optical effect known as the checker-shadow illusion. T1 pseudohyperintensity should be considered when apparently high T1 signal intensity is seen only on fat-suppressed images; review of non-fat-suppressed images may help prevent an erroneous diagnoses of blood-containing lesions.
authors.affiliation: Department of Radiology and Biomedical Imaging, University of California San Francisco, CA, USA.
authors.forename: Tuan N
authors.initials: TN
authors.lastname: Huynh
authors.forename: Thor
authors.initials: T
authors.lastname: Johnson
authors.forename: Liina
authors.initials: L
authors.lastname: Poder
authors.forename: Bonnie N
authors.initials: BN
authors.lastname: Joe
authors.forename: Emily M
authors.initials: EM
authors.lastname: Webb
authors.forename: Fergus V
authors.initials: FV
authors.lastname: Coakley
mesh_terms: D000368:Aged; D002292:Carcinoma, Renal Cell / Q000175:diagnosis*; D003287:Contrast Media; D003536:Cystadenocarcinoma / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis*; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media