M agnetic Resonance Imaging and DW I Features of Orbital Rhabdom yosarcoma

Xuetao Mu， Hong Wang， Yueyue Li， Yuwen Hao， Chunnan Wu， Lin Ma

1 Department of Radiology， Chinese PLA General Hospital， Beijing 100853， China

2 Department of MRI， General Hospital of Armed Police， Beijing 100039， China

3 Institute of Orbital Disease， General Hospital of Armed Police， Beijing 100039， China

4 Computer Centre， General Hospital of Armed Police， Beijing 100039， China

Introduction

Materials and methods

Results

Figure 1 A 2-year-old boy w ith embryonal rhabdomyosarcoma w ith ethmoidal sinus and intracranial invasion.Figure 1A-C：Axial T1W I，T2W I and sagittal T2W I demonstrated a superonasal lesion in the right orbit w ith ethmoidal sinus and intracranial invasion.Figure 1D-F： The lesion and the invaded meninges showed marked heterogeneous enhancement on postcontrast axial， coronal，and sagittal T1WIw ith fat saturation.

Discussion

Figure 2 A 10-year-old boy with heterogeneous rhabdomyosarcoma w ith nasal invasion.Figure 2A-B：Axial T1WI and T2WI demonstrated a lesion w ith heterogeneous signals w ith focal areas of increased signal on T1W I and decreased signal on T2W I（arrow）.The lesion also showed nasal invasion.Figure 2C： The lesion showed focal areas w ith hypointense signal on SW I（arrow）.Figure 2D-F： The lesion showed heterogeneous enhancement on postcontrast axial， coronal， and sagittal T1W I w ith fat saturation.

Figure 3 A 2-year-old boy w ith embryonal rhabdomyosarcoma..Figure 3A：.Axial T1W I demonstrated an oval extraconal lesion in the right orbit w ith an isointense signal relative to the muscle..Figure 3B：.The lesion showed a heterogeneously hyperintense signal on T2W I..Figure 1C：.The lesion showed a hyperintense signal on DW I （b＝1000）..Figure 3D-F：.The lesion showed a marked heterogeneous enhancement on postcontrast axial， coronal， and sagittal T1W I w ith fat saturation.