Figure 1. MRI abdomen and pelvis. SagittalT2 short tau inversion recovery (STIR) sequence showing a 3 cm lobulated soft tissue mass lying anterior to the tip of the coccyx, and a second small rounded soft tissue mass superiorly in the pelvis.
Figure 2. Histology of the excised mass showing plump bipolar spindle cells and epithelial-looking cells arranged in loose fascicles with extensive myxoid degeneration forming pseudoacinar structures.