The dynamic contrast enhanced-magnetic resonance imaging and diffusion-weighted imaging features of alveolar soft part sarcoma

Figures

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  Figure 1. Illustration of ROI placement for ADC calculation. An ROI was placed on the T1-weighted image (A) and T2-weighted image (B), which automatically generated the ADC value of the lesion and was mapped on the ADC map (C, green elliptical region). A, anterior; R, right; L, left; ROI, region of interest; ADC, apparent diffusion coefficient.

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  Figure 2. The tumors were performed on 3.0-T MRI scanner showed heterogenous high signal intensity compared with muscle on the coronal T2WI (A), and on the fat-suppressed sagittal T2WI (B). MRI, magnetic resonance imaging; T2WI, T2-weighted imaging.

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  Figure 3. The T1-weighted image shows a well-defined mass in the deep muscle, revealing slightly high signal intensity on 1.5-T MRI scanner. MRI, magnetic resonance imaging.

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  Figure 4. The axial (A) and sagittal (B) T1-weighted images of 3.0-T MRI scanner reveal the high signal intensity mass relative to muscle with internal hemorrhage (arrows). MRI, magnetic resonance imaging.

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  Figure 5. The coronal T2-weighted fat suppressed image of 3.0-T MRI scanner shows the mass manifesting high signal intensity compared to muscle (A), and the T1-weighted image (B) shows that the mass was hyperintense relative to muscle with intra- and extratumoral flow void vessels (arrows). MRI, magnetic resonance imaging.

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  Figure 6. The axial DWI-weighted image at b=800 mm2/s on 3.0-T MRI scanner shows a higher signal (A), and the corresponding gray-scale ADC map shows restriction (B). DWI, diffusion-weighted imaging; MRI, magnetic resonance imaging; ADC, apparent diffusion coefficient.

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  Figure 7. The DCE-MRI and CT findings of ASPS. The mass manifested early arterial enhancement at 2'3'' (A) and intense persistent enhancement at 4'22'' (B) on the DCE-MRI on 3.0-T MRI scanner, and the mass manifested intense persistent enhancement on the CT image (C,D). DCE-MRI, dynamic contrast enhanced-magnetic resonance imaging; CT, computed tomography; ASPS, alveolar soft part sarcoma.

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  Figure 8. The TIC of ASPS on 3.0-T MRI scanner. (A,B) Male, 18 years old: (A) the placement of the region of interest on the raw image; (B) TIC, L1, L2, L3, and L5 represent lesions showing a rapid rise and slow washout type, L4 represents the internal hemorrhage, and L6 represents adjacent muscle. (C,D) Male, 49 years old: (C) the placement of the region of interest on the raw image; (D) the TIC of the L5 lesion shows a rapid rise and slow washout type, and L6 is the vessel. R, right; L1–6, line 1–6; ASPS, alveolar soft part sarcoma; TIC, time-intensity curve; MRI, magnetic resonance imaging.

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  Figure 9. CTA shows a large hypervascular mass with multiple enlarged tortuous vessels (arrow). CTA, computed tomography angiography.

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  Figure 10. The CT images of lung metastasis. (A) Female, 48 years old, the coronal pulmonary window shows bilateral lung metastasis, predominating in the inferior lobes, at the initial visit. (B,C) Male, 30 years old: (B) the coronal pulmonary window; (C) the coronal mediastinal window in the venous phase; metastatic lung disease showed remarkable persistent enhancement. CT, computed tomography; A, anterior.