Percutaneous drainage of pelvic collection - axial view. The large pelvic collection (10.1 cm × 9.6 cm) was drained percutaneously under computerised tomography guidance, and an 8 French Pigtail drain was left in situ in the rectouterine pouch of Douglas, as evident by the radio-opaque linear object at the 7 o’clock position, as indicated by the arrowhead.