title: Delineation of maxillofacial cutaneous lesions by means of high-resolution magnetic resonance imaging.
abstract: To evaluate the use of high-resolution magnetic resonance imaging (MRI) for the differentiation of skin tumors in the maxillofacial region, 60 patients (25 female) were examined in a 1.5-T whole-body MR imager with a 2.5-cm surface coil. Plain transverse T1-(TR 500 ms, TE 25 ms), T2-(2200 ms, TE 80 ms), fat-(TR 500 ms, TE 28 ms), and water-suppressed (TR 500 ms, TE 38 ms) SE sequences were used. Following the application of the paramagnetic contrast agent Gd-DTPA, transverse T-weighted and fat suppression sequences were repeated. Before and after contrast administration, tumor signal intensities and percent contrast enhancement were determined by a ROI technique. All tumors were classified by standard histologic technique and evaluated with regard to their response to contrast medium. Quantitative evaluation was performed by three independent radiologists. Additionally, signal- and contrast-to-noise ratios were calculated for each tumor type. All MRI findings were compared with histology. Significant contrast enhancement occurred in most tumors; malignant tumors displayed inhomogeneous enhancement. The optimal pulse sequences for tumor delineation are plain T1-weighted, water-suppressed, and contrast-enhanced fat-suppressed sequences. Tumors could not be specified by signal intensities or percent contrast enhancement, and CNR did not allow for malignant lesions to be differentiated from benign tumors. High-resolution MRI proved to be an adequate method for imaging skin tumors and their inner structure. Tumor typing was not possible by either contrast-administration or modification of sequence parameters. In this regard, further innovations in contrast agent design seem to be necessary.
authors.affiliation: Department of Radiology, Virchow-Hospital, Medical Facility, Humboldt-University, Berlin, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Mäurer
authors.forename: F D
authors.initials: FD
authors.lastname: Knollmann
authors.forename: B
authors.initials: B
authors.lastname: Hell
authors.forename: C
authors.initials: C
authors.lastname: Radke
authors.forename: R
authors.initials: R
authors.lastname: Felix
mesh_terms: D000328:Adult; D000368:Aged; D005145:Face / Q000473:pathology*; D005260:Female; D006801:Humans; D007568:Jaw / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012878:Skin Neoplasms / Q000175:diagnosis* / Q000473:pathology*