postductal en · ADJ
Etymology
From post- + ductal.
Meanings
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(not-comparable) Distal to or downstream of a ductus (for example, the ductus arteriosus).
Aortic coarctation is congenital focal narrowing of the aorta in the region of the ductus arteriosus. It may be preductal (proximal to the ductus, illustrated on the right [in the original]), periductal, or postductal.
2013, Jacob Mandell, Core Radiology: A Visual Approach to Diagnostic Imaging (Cambridge Medicine), →ISBN, page 769: