Utilizing two needles, punctured into the cystic space (red arrow) and subarachnoid space (green arrow) under digital subtraction angiography (DSA), drains the fluids. In this way, pressure is balanced between the two spaces. The 10 mL of contrast medium was then injected into the subarachnoid space (from the lower needle). Under DSA, we observed contrast medium infiltrating into the cystic space at the T12/L1 level (blue arrow)