When human filariasis causes inflammation of the lymphatic vessels and thickens the walls, the lymphatic vessels from the intestinal trunk to the thoracic duct are dilated, the valves in the vessels close incompletely, resulting in a dynamic obstruction and a blockage of the lymphatic fluid, the pressure in the lymphatic vessels increases and rupture occurs at the weakest point. The common site of rupture is at the fornix of the renal pelvis, and a pelvic-lymphatic fistula may result. Differential diagnosis: Lymphatic duct rupture needs to be differentiated from the following symptoms: 1. Cystoscopy and pyelogram: During an episode of celiac disease, cystoscopy can reveal celiac sprays from the affected ureter, and a celiac test can also be performed from bilateral ureteral cannulae. Occasionally, milk droplets may be seen oozing from the bladder wall as a result of a vesicolymphatic fistula. In retrograde pyelograms, lymphatic reflux in the pelvic calyces is sometimes seen, but this cannot be used as a basis for the diagnosis of pelvic lymphatic fistula. Intravenous pyelogram has no value for the diagnosis of celiac disease. 2. Lymphangiography: Lymphangiography can be performed by puncturing the dorsum of the foot and the lymphatic vessels of the spermatic cord, which is the most reliable method for the localization and diagnosis of celiac disease. It can detect the presence of pelvic lymphatic fistulas in both episodes and intervals, and the site of the lesion can be determined. Lymphangiography in patients with celiac disease: (1) the lymphatic vessels are often dilated, thickened, twisted or have reticular changes. (2) The formation of a lymphatic duct- calyx fistula, which causes partial visualization of the calyx and renal pelvis. In most patients, the thoracic duct is not dilated or obstructed, and the lower end is often unremarkable, and the celiac pond can usually be seen at the T11-L2 level. ④Traffic branches can be seen between the bilateral retroperitoneal lymphatic vessels. The most common site of urinary lymphatic vessel rupture is the renal pelvis (because the lymphatic vessels of the kidney are the most fragile), followed by the ureter, and sometimes seen in the bladder and posterior urethra.