Abstract Distinguishing primary aneurysms of the superficial venous system, and in particular, the medial marginal vein of the foot, from soft tissue tumors such as ganglia or angiomas may present a diagnostic dilemma Musculoskeletal ultrasound provides an opportunity to make clear distinctions and resolve such a dilemma. We report the case of a 34-year-old male who presented with a painless, slowly enlarging mass located on the dorsal aspect of the left foot and initially suspected to be a ganglion. Ultrasound evaluation was done using a Logic P9 GE machine, equipped with a 15 MHz high-frequency linear probe and Doppler. The findings are those of a dilated, non-thrombosed mass, with sonographic features of a venous aneurysm of the medial marginal vein. It measures about 2.1 cm in diameter and 3.4 cm in length and has the classic “yin-yang” Doppler flow pattern, which confirms the diagnosis. Although this condition is rare and poorly reported within the Nigerian population, a correct diagnosis through careful clinical examination and imaging is essential to determine the best course of treatment. This condition may be confused with ganglion cysts, tendon pathologies, and bursitis; the use of color flow and pulsed Doppler applications is recommended for easy distinction.
Erondu et al. (Mon,) studied this question.