Fig. 2

Imaging findings of lymphoscintigraphy: ①~④ are anterior views, and ⑤~⑧ are posterior views. The imaging agent was injected subcutaneously between the first and second toes, as well as the fourth and fifth toes of both feet. Whole-body imaging was performed at 10 min, 1 h, 3 h, and 6 h, post-injection. Lymphatic return in both lower extremities was slow. The upper mediastinal lymphatic vessels and bilateral venous angles were widened and continuously visualized, suggesting bilateral venous angle drainage and potential obstruction of the thoracic duct outlet