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Fig. 1 | World Journal of Surgical Oncology

Fig. 1

From: TFE3-associated perivascular epithelioid cell tumor with complete response to mTOR inhibitor therapy: report of first case and literature review

Fig. 1

(1) Pre-chemotherapy (A) and post-chemotherapy (B) axial MRI sections of the pelvis at the level of the third sacral vertebrae. Sequences have been taken with high TE and TR values (viz. T2 weighting). The pretherapy scan (A) shows the bulky multilobulated mass (straight white arrow) with multiple satellite lesions (straight black arrow). On post therapy scan after 3 months (B), the main lesion shows near complete regression (straight white arrow) while the satellite lesions which were showing cystic degeneration (straight black arrow) have converted to much smaller hemorrhagic cysts (note the fluid-fluid level within the cyst). Also note that the urinary bladder (curved white arrow) and the rectum (curved black arrow) which were grossly compressed by the mass in the pre-therapy scan could be well visualized in the post therapy scan, confirming the regression of the tumor. Also note the reduction of signal intensity in after treatment signifying that the remaining tissue may just be the non-viable fibrotic tumoral remnant. (2) On post therapy scan after 6 months, there was no evidence of any solid mass lesion or altered enhancement noted, urinary bladder( straight long arrow) and rectum(straight short arrow) can now be clearly seen without compression.

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