We present the first reported MR imaging findings of a histologically prove
n clear cell hidradenoma. A fluid level was noted on all pulse sequences in
this lesion, which demonstrated a prominent hemorrhagic component on secti
oning. The presence of an enhancing nodule was also noted, differentiating
this lesion from a post-traumatic hematoma. Fluid levels in a well-defined
subcutaneous soft tissue mass should suggest the possibility of a hidradeno
ma.