Clinical Introduction

A 51-year-old man presented to the ED with a painful nodule on his right medial calf region for 4 days. He had varicose veins at both lower legs for more than 4 years, but no mass was noted until recent days. He denied prior trauma history or other symptoms. Physical examination revealed a tender, erythematous nodule about 2×2 cm located on the right calf with surrounding rash (figure 1A). Point-of-care ultrasonography of the right lower extremity was …