(19) Radiographically, it appears as a focal area of
lucency involving the subchondral bone with a varying amount of surrounding sclerosis (Figure 8).
Computed tomography (CT) demonstrated a 2-mm
lucency on the oval window (figure 1).
In addition, the right subphrenic
lucency is noted as potentially due to postoperative residual intraperitoneal gas.
The laboratory tests are of minimal value except in connective tissue disorder, hemoglobinopathy, or a coagulation disorder.1,9 The radiologic investigations for diagnosis are plain radiographs, MRI, Bone scintigraphy, CT scan and angiography1,7,13 The high rate of bilateral AVN (>60%) and contra-lateral occult disease warrants imaging of the unaffected hip.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.9-13
Radiographically, there is persistent
lucency along fracture lines with smooth rounded sclerotic margins.
Caption: Figure 2: Electron microscopy image showing a glomerular capillary loop with subendothelial widening and
lucency (star), typical of microangiopathic endothelial cell injury.
Caption: Figure 2: Proximal and distal
lucency consistent with spontaneous LAD coronary artery dissection.
Computed tomography (CT) scan demonstrated an expansile
lucency at the proximal aspect of the first metatarsal base toward the dorsal lateral side (Figure 3).
BC is encapsulated and this translates radiographically as a thin, uniform
lucency around the periphery of the tumor.
Cementoblastomas are encapsulated and this translates radiographically as a thin, uniform
lucency around the periphery of the tumor.
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.