Abstract
Purpose
The purpose of the study was to retrospectively analyze MRI findings of renal cell carcinoma associated with Xp11.2 translocation/TFE3 gene fusion (Xp11.2/TFE RCC) in adults.
Methods
Sixteen patients with Xp11.2/TFE RCC were reviewed retrospectively. The clinical characteristics and imaging features were assessed and then compared between metastatic and non-metastatic subgroups.
Results
The mean age at diagnosis was 47.4 (20–76) years. Seven (44 %) patients were men, and nine (56 %) patients were women. The lesions predominantly exhibited an endophytic distribution (n = 14, 88 %) with a capsule (n = 16, 100 %), accompanied by solid and cystic patterns (n = 12, 75%) and hemorrhage (n = 11, 69 %). The tumors prevalently appeared hyper- to isointense on T1WI (n = 14, 88 %), hypointense on T2WI (n = 13, 81 %), and hyperintense on DWI (n = 16, 100 %) with a lower ADC (P < 0.001) than that of the surrounding tissue. The tumors were less enhanced than the normal renal cortex in all phases with a prolonged enhancement pattern (P ≤ 0.001). In addition, six patients (38 %) developed recurrence or metastases. The RCCs with metastases showed an irregular shape (P = 0.013), an incomplete capsule (P = 0.018), heterogeneous solid-cystic patterns (P = 0.034), and hemorrhage (P = 0.037) than non-metastatic subgroups.
Conclusions
MRI provides valuable information for the diagnosis of adult Xp11.2/TFE RCCs. Features including irregular shape, incomplete capsule, mixed solid-cystic pattern, and hemorrhage may indicate the occurrence of recurrence or metastases.
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Abbreviations
- WHO:
-
World Health Organization
- RCC:
-
Renal cell carcinoma
- Xp11.2/TFE RCC:
-
Xp11.2 Translocation/TFE3 gene fusion renal cell carcinoma
- CT:
-
Computed tomography
- PET-CT:
-
Positron emission tomography-computed tomography
- DWI:
-
Diffusion-weighted imaging
- ADC:
-
Apparent diffusion coefficient
- IHC:
-
Immunohistochemistry
- FISH:
-
Fluorescence in situ hybridization
- ROI:
-
Region of interest
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Dai, C., Sheng, R., Ding, Y. et al. Magnetic resonance imaging findings of renal cell carcinoma associated with Xp11.2 translocation/TFE3 gene fusion in adults: a pilot study. Abdom Radiol 44, 209–217 (2019). https://doi.org/10.1007/s00261-018-1703-0
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DOI: https://doi.org/10.1007/s00261-018-1703-0