Eccrine sweat gland tumor of clear cell origin involving the eyelids.

A 47-year-old patient with an unusual tumor involving the right upper and lower eyelids has been followed for almost 6 years. The tumor has remained localized to the eyelids and has recurred locally following attempts at complete or partial excision. The morphological features of the tumor as seen by ordinary light microscopic methods were puzzling, and resulted in a variety of pathologic diagnoses. Light microscopic examination of plastic-embedded semithin sections, and electron microscopic examination indicate that this is a hitherto undescribed eccrine sweat gland tumor of clear cell origin. Its infiltrative growth pattern and tendency to local recurrence suggests that it may be a low-grade malignant neoplasm.