Table of Contents
ISRN Radiology
Volume 2013, Article ID 627932, 9 pages
http://dx.doi.org/10.5402/2013/627932
Research Article

Whole Body MRI at 3T with Quantitative Diffusion Weighted Imaging and Contrast-Enhanced Sequences for the Characterization of Peripheral Lesions in Patients with Neurofibromatosis Type 2 and Schwannomatosis

1The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
2Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
3Department of Orthopaedic Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
4The Johns Hopkins Hospital Comprehensive Neurofibromatosis Center, Department of Neurology, The Johns Hopkins Hospital, CRB II, Suite 1M16, 1550 Orleans Street, Baltimore, MD 21231, USA
5Department of Neurology and Cancer Center, Massachusetts General Hospital, Boston, MA, USA
6Neurofibromatosis Clinic, Pappas Center for Neuro-Oncology, Massachusetts General Hospital, 55 Fruit Street, YAW 9, Boston, MA 02114, USA
7Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
8Pharmacology & Experimental Therapeutics Section, Pediatric Oncology Branch, NCI, CCR, Room 1-5750, 10 Center Drive, 10-CRC, MSC 1101, Bethesda, MD 20892, USA

Received 20 June 2013; Accepted 13 August 2013

Academic Editors: A. Labate and K. Tsuchiya

Copyright © 2013 Laura M. Fayad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. WB-MRI is mainly used for tumor detection and surveillance. The purpose of this study is to establish the feasibility of WB-MRI at 3T for lesion characterization, with DWI/ADC-mapping and contrast-enhanced sequences, in patients with neurofibromatosis type 2 (NF-2) and schwannomatosis. Materials and Methods. At 3T, WB-MRI was performed in 11 subjects (10 NF-2 and 1 schwannomatosis) with STIR, T1, contrast-enhanced T1, and DWI/ADC mapping ( , 400, 800 s/mm2). Two readers reviewed imaging for the presence and character of peripheral lesions. Lesion size and features (signal intensity, heterogeneity, enhancement characteristics, and ADC values) were recorded. Descriptive statistics were reported. Results. Twenty-three lesions were identified, with average size of  cm. Lesions were characterized as tumors (21/23) or cysts (2/23) by contrast-enhancement properties (enhancement in tumors, no enhancement in cysts). On T1, tumors were homogeneously isointense (5/21) or hypointense (16/21); on STIR, tumors were hyperintense and homogeneous (10/21) or heterogeneous (11/21); on postcontrast T1, tumors enhanced homogeneously (14/21) or heterogeneously (7/21); on DWI, tumor ADC values were variable (range 0.8–2.7), suggesting variability in intrinsic tumor properties. Conclusion. WB-MRI with quantitative DWI and contrast-enhanced sequences at 3T is feasible and advances the utility of WB-MRI not only to include detection, but also to provide additional metrics for lesion characterization.