Renal epithelioid angiomyolipoma: MRI findings. 2017

Yan Zhong, and Yanguang Shen, and Jingjing Pan, and Yingwei Wang, and Yunxia An, and Aitao Guo, and Lu Ma, and Huiyi Ye, and Haiyi Wang
Department of Radiology, Chinese PLA General Hospital, Fuxing Road 28, Box 100853, Beijing, China.

OBJECTIVE To retrospectively analyze the MR imaging presentation of renal epithelioid angiomyolipoma (EAML). METHODS Retrospective analysis revealed 12 subjects with histologically proven renal EAML who underwent preoperative MRI at our institution between January 2009 and June 2016. Two radiologists reviewed the images in consensus, describing MR imaging features including size, location, growth pattern, signal intensity of tumor, and dynamic enhancement pattern. RESULTS Nine women and three men were included. The average maximum tumor diameter was 7.1 cm. Exophytic growth was present in 9/12 cases, mesophytic growth in 2/12, and endophytic growth in 1/12. On T1-weighted images, 2/12 displayed homogeneous isointensity, 1/12 homogeneous hyperintensity, 5/12 heterogeneous hypointensity, and 4/12 heterogeneous hyperintensity. Macroscopic fat was detected in 5/12 cases and microscopic fat in 6/12 cases. On T2-weighted images, 5/12 showed heterogeneous hypointensity, 4/12 heterogeneous hyperintensity, and 3/12 homogeneous hypointensity. On dynamic contrast-enhanced MR images, 7/12 showed a slow washout enhancement pattern, 2/12 a rapid washout pattern, 2/12 progressive enhancement, and 1/12 persistent enhancement. Imaging findings were suggestive of hemorrhage (50%), necrosis (25%), or cystic change (50%) within the tumors. Enlarged vessels were detected in 5/12 cases. One tumor extended into the renal sinus. No metastases were found on the preoperative MR imaging. CONCLUSIONS Although MRI appearances of renal EAML were various, some MRI characteristics may contribute to suggest the possibility of renal EAML.

UI MeSH Term Description Entries
D007680 Kidney Neoplasms Tumors or cancers of the KIDNEY. Cancer of Kidney,Kidney Cancer,Renal Cancer,Cancer of the Kidney,Neoplasms, Kidney,Renal Neoplasms,Cancer, Kidney,Cancer, Renal,Cancers, Kidney,Cancers, Renal,Kidney Cancers,Kidney Neoplasm,Neoplasm, Kidney,Neoplasm, Renal,Neoplasms, Renal,Renal Cancers,Renal Neoplasm
D008279 Magnetic Resonance Imaging Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques. Chemical Shift Imaging,MR Tomography,MRI Scans,MRI, Functional,Magnetic Resonance Image,Magnetic Resonance Imaging, Functional,Magnetization Transfer Contrast Imaging,NMR Imaging,NMR Tomography,Tomography, NMR,Tomography, Proton Spin,fMRI,Functional Magnetic Resonance Imaging,Imaging, Chemical Shift,Proton Spin Tomography,Spin Echo Imaging,Steady-State Free Precession MRI,Tomography, MR,Zeugmatography,Chemical Shift Imagings,Echo Imaging, Spin,Echo Imagings, Spin,Functional MRI,Functional MRIs,Image, Magnetic Resonance,Imaging, Magnetic Resonance,Imaging, NMR,Imaging, Spin Echo,Imagings, Chemical Shift,Imagings, Spin Echo,MRI Scan,MRIs, Functional,Magnetic Resonance Images,Resonance Image, Magnetic,Scan, MRI,Scans, MRI,Shift Imaging, Chemical,Shift Imagings, Chemical,Spin Echo Imagings,Steady State Free Precession MRI
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D003287 Contrast Media Substances used to allow enhanced visualization of tissues. Radiopaque Media,Contrast Agent,Contrast Agents,Contrast Material,Contrast Materials,Radiocontrast Agent,Radiocontrast Agents,Radiocontrast Media,Agent, Contrast,Agent, Radiocontrast,Agents, Contrast,Agents, Radiocontrast,Material, Contrast,Materials, Contrast,Media, Contrast,Media, Radiocontrast,Media, Radiopaque
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults
D012189 Retrospective Studies Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons. Retrospective Study,Studies, Retrospective,Study, Retrospective
D018207 Angiomyolipoma A benign tumor containing vascular, adipose, and muscle elements. It occurs most often in the kidney with smooth muscle elements (angiolipoleiomyoma) in association with tuberous sclerosis. (Dorland, 27th ed) Angiomyolipomas

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