• P A Lönnqvist and U Hildingsson.
• Department of Paediatric Anaesthesia and Intensive care, St Görans Paediatric Hospital, Karolinska Institute, Stockholm, Sweden.
• Anaesthesia. 1992 Dec 1;47(12):1051-2.

AbstractThe caudal limit of the thoracic paravertebral space was examined in 13 human cadavers. The origin of the psoas major muscle was found to completely seal off the paravertebral space below the level of the 12th thoracic vertebra. The possibility of caudal spread of a thoracic paravertebral block below this level through the paravertebral space would appear unlikely.

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