Fig. 1

Imaging features of ARID1A deficient undifferentiated spindle cell and rhabdoid sarcoma of the prostate. (a) Magnetic resonance imaging (MRI) revealing a large, ill-defined, prostatic mass lesion with circumferential extension into the rectal wall (as indicated by arrows). (b) Positron emission tomography-computed tomography scan showing a mixed mass of the prostate with an uneven increase in fluorodeoxyglucose metabolism. (c) MRI showing that the prostatic tumor is significantly enlarged with central areas of hemorrhage, necrosis and cystic change (as indicated by arrows), after 2 months of chemotherapy with etoposide and cisplatin