1. Measurement of the ECL angle between the midline xy and the conchal lamina.
Measurement of the ECL angle between the midline xy and the conchal lamina. The conchal lamina is the upper part of the ethmoidal turbinate wall (Fig 1). A line lm is drawn tangent and parallel to the conchal lamina on the pathologic side to measure the ECL angle. In patients, the line lm also represents the border between the median opacity without recognizable bony lamella and the lateral opacity squeezed onto the orbital wall in which ethmoidal bony lamellas are still recognizable.
T. Georgel et al. AJNR Am J Neuroradiol 2009;30:
©2009 by American Society of Neuroradiology