Thirty cases of chyluria seen in Rangoon during the years 1968-1973 have been investigated. Blood micro-filaria was positive in only a small number of cases. Renal function was not disturbed and blood eosinophil count was normal. The duration of symptoms varied from 3 months to 10 years. Males and females were equally affected and the disease was much more commonly seen in the 20 and 40 age group. Retrograde pyelography demonstrated pyelolymphatic reflux. Lymphangiograms showed numerous lymphatics in the region of the calves and contrast was often seen in the calyceal system. The thoracic duct was patent in all the cases. Renal lymphatics were opacified in three patients who were investigated by intravenous urography. Para-renal cysts, pressure on the renal pelvis by an enlarged lymph node and dilated lymphatic vessels were associated features.