title: Intraocular hemorrhage and mimicking lesions: role of gradient-echo and contrast-enhanced MRI.
abstract: Intraocular hemorrhage and mimicking lesions on precontrast spin-echo magnetic resonance images were examined with contrast material and/or gradient-echo pulse sequence. Twenty-two melanomas, nine retinoblastomas, four hemorrhages, one metastasis, and one toxocara endophthalmitis were examined. With contrast material, all tumors demonstrated enhancement, whereas hemorrhage did not. Retinoblastomas demonstrated a heterogeneous enhancement pattern. Computed tomography demonstrated corresponding intratumoral calcifications at the areas of no enhancement. Gradient-echo images demonstrated a heterogeneous pattern in the majority of the lesions compared to spin-echo images. However, relatively characteristic small round areas of signal drop-off representing calcification were observed in about half of the retinoblastomas.
authors.affiliation: Department of Radiology, Tulane University Medical Center, New Orleans, Louisiana.
authors.forename: F
authors.initials: F
authors.lastname: Mihara
authors.forename: K L
authors.initials: KL
authors.lastname: Gupta
authors.forename: J N
authors.initials: JN
authors.lastname: Joslyn
authors.forename: B G
authors.initials: BG
authors.lastname: Haik
mesh_terms: D000818:Animals; D003287:Contrast Media; D009877:Endophthalmitis / Q000175:diagnosis / Q000469:parasitology; D005134:Eye Neoplasms / Q000150:complications* / Q000175:diagnosis / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D008545:Melanoma / Q000150:complications / Q000175:diagnosis; D012166:Retinal Hemorrhage / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology; D012175:Retinoblastoma / Q000150:complications / Q000175:diagnosis; D014057:Tomography, X-Ray Computed; D014120:Toxocariasis / Q000469:parasitology; D014463:Ultrasonography; D014604:Uveal Neoplasms / Q000150:complications / Q000175:diagnosis
chemical_list: D003287:Contrast Media