case_images: PMC4323710_01
case_images: Conscious sedation with inhaled 50% nitrous oxide/ oxygen premix during PDT
  session
case_images: abd-90-01-0120-g01.jpg
case_images: PMC4323710_01_abd-90-01-0120-g01.jpg
case_images: f01
case_images: An inhaled 50% nitrous oxide/oxygen premix was administered using a face mask, yielding conscious sedation and pain relief during the entire treatment (Figure 1).
case_images: Dysuria, pain, and pruritus severity score according to the patient's own
  records over time, and its relation to PDT sessions. wks, weeks
case_images: abd-90-01-0120-g02.jpg
case_images: PMC4323710_01_abd-90-01-0120-g02.jpg
case_images: f02
case_images: However, a long-lasting response was experienced after the third session, with absent to mild pain or pruritus during nine months, before recurrence and the need for a fourth treatment (Figure 2).