Haller index
X-ray computed tomography (Axial)
Haller's index is calculated using the ratio between maximal thoracic transverse diameter divided by maximal thoracic anteroposterior diameter. In pectus excavatum, the index is > 3.25.
Haller JA, Kramer SS, Lietman SA. Use of CT scans in selection of patients for pectus excavatum surgery: a preliminary report. J. Pediatr. Surg. 1987;22 (10): 904-6.
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