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Allowing the passage of x-rays or other radiation; not radiopaque.

ra′di·o·lu′cen·cy n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(General Physics) the quality or state of being radiolucent
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Abdominal X-ray shows a curvilinear area of increased radiolucency delineating the urinary bladder wall with or without intraluminal air.
Radiographically: no signs of periapical or inter-radicular radiolucency, pathological root resorption)
The periapical radiograph showed a widening of the root canal space in the coronal part of the mesial root, suggesting VRF (12) and a small periapical radiolucency in the mesial root (Fig.
For teeth with irreversible pulpitis or necrosis without interradicular or periapical radiolucency, endodontic treatment was performed in a single visit.
Radiographs were taken before beginning the procedure to check for the presence of any apical radiolucency in the periapical region.
Progressive radiolucency between the bone and the components and loosening or migration of the implant were evaluated after observation in the follow-up radiographs (anteroposteriorlateral and patella tangential views).
Periapical radiolucency is seen involving apices of both roots of the fused teeth [Figure 2].
The usual presentation is in the mandible and with a lateral radiolucency, and the entity spreads mesiodistally and has minimal buccolateral swelling (5, 6).
While radiography remains the modality-of-choice in diagnosing ingested and aspirated FBs, fluoroscopy and enhanced CT can prove very helpful with radiolucency and other complicated cases.
Imaging studies (orthopantomographs) usually show a unilocular radiolucency surrounding the crown of the affected tooth (figure 1), with a well-defined sclerotic border.
The previously treated abutment (>10 years ago, by other colleagues) was originally restored with a metal cast post-and-core extending up to the coronal third of the root; the intraoral periapical X-ray revealed a partially treated and/or filled root canal space, accompanied by a slight radiolucency at the mesial side of the apex (Figure 2).
The radiolucency around the bone-cement interface was apparent, but no progression was seen compared with the X-rays done at 12 months postoperatively.