Inclusion Criteria:  Patients undergoing pectus excavatum repair with NUSS technique aged 12 years or above12 informed consent signed for cryoanalgesia  Exclusion Criteria:  - Age of 11 years or below  Refuse to receive cryoanalgesia or epidural catheter as primary pain relief Any contraindication to cryoanalgesia Difficult follow-up for geographical reasons and/or impossibility by the patient to understand how to perform self-measurements