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Paravertebral block (PVB) might be a technique of choice for hernia surgery due to its unilateral segmental anesthesia of the operative site, good muscle relaxation and prolonged postoperative analgesia. Despite PVB effectiveness, a continuing search for a reliable, timely and effective technique generates the investigation of a single PVB injection for children undergoing unilateral inguinal hernia repair. Two theoretical concepts were behind this investigation. First, possible spread of single PVB injection in the lumbar area over dermatomes corresponding to the inguinal hernia region in children likewise the spread over multiple adjacent segments from a single thoracic PVB injection. Second, as the inguinal region receives innervation from the ilioinguinal, iliohypogastric and genitofemoral nerves, all three arising from L1-L2 level; thus, a single PVB injection at this level could provide unilateral segmental anesthesia.