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1. Giving off light; luminous.
2. Translucent; clear.

[Latin lūcēns, lūcent-, present participle of lūcēre, to shine; see leuk- in Indo-European roots.]

lu′cen·cy n.
lu′cent·ly adv.


(ˈluːsənsɪ) or


radiance; luminosity
References in periodicals archive ?
9 The earliest radiographic signs are lucency and sub-chondral sclerosis of femoral head followed by sub-chondral collapse (crescent sign), femoral head flattening and narrowing of articular space.
Radiologic anomalies; cella turcica bridging, vertebral anomalies including hemivertebra and combined vertebral corpi, flame-like lucency on hand and foot X-rays 5.
Periosteal thickening of the lateral cortex together with a transverse cortical lucency can be detected on plain radiographs in the early stages.
11] In addition, on a well-exposed film there is a rim of lucency on the inside edge of the battery, [13] also known as the 'halo' sign (Fig.
2,11) Abnormalities on x-ray are usually seen after 2 to 8 weeks of symptoms (2,7,11) and may include a faint periosteal reaction, a fluffy area of callus, or a cortical lucency sometimes referred to as the "dreaded black line.
Initial workup included a CT scan of the thorax through the ER, which showed a subareolar mass without central lucency in the right breast, posterior inflammatory stranding, as well as right mediastinal and axillary lymphadenopathy (Figure 1).
21-23,28-32) On mammography, tubular carcinoma shows a spiculated mass or architectural distortion, which may contain a central area of lucency.
Signs of osteomyelitis (bone lucency, irregular fracture margins, periosteal reactions), occurrence of synostosis, loosening of screws, or additional fractures were noted.
Furthermore, areas of central lucency were identified and no connection was found between the mass and the femur.
Lucency was also noted within the left upper lobe, which was suspicious for cavitary change and further evaluation with CT was recommended for possible pulmonary tuberculosis.
Caption: Figure 1: A 35-year-old male with frontal radiographs of the distal right femur and left knee: there is permeative mixed sclerosis and lucency (arrow) in the distal femoral and proximal tibial shafts.