Venous cystic adventitial disease of the common femoral vein.

Venous adventitial cystic disease is a rare condition with few reports previously described. We report the case of a 39-year-old female who presented with left lower extremity edema, acutely exacerbated by exercise. Imaging revealed a hypoechoic mass posterior to her left common femoral vein. Open surgical excision and evacuation was performed with resolution of symptoms within 24 hours. A review of the literature is discussed, along with presentation, diagnosis, treatment, and pathology of this intriguing condition.