crescent sign


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crescent sign

1. in radiography of the lung, a crescent of gas near the top of a mass lesion, signifying cavitation with a space above the debris; seen in aspergilloma, hydatidoma;
2. in computed tomography, a high attenuating layer of new blood in an aneurysm; indicates a ruptured abdominal aortic aneurysm;
3. in diagnostic ultrasound, a sonolucent crescentic layer in a tumor mass, typically necrosis in stromal tumors of the small bowel;
4. in diagnostic ultrasound, a hyperechoic crescent, representing the entering limb of an intussusception; also known as crescent-in-a-doughnut;
5. in osteoradiology, a subcortical lucent crescent in the femoral head, signifying osteonecrosis.
Synonym(s): meniscus sign
Imaging—bone A curved subcortical radiolucency corresponding to a fracture line and bony collapse, which is seen in early ischemic necrosis of the epiphysis of the femoral head, a finding that may also be seen in the humoral head, and accentuated by traction. Fractures that occur in subchondral bone may be recognised by a crescentic lucent zone that separates the fragment from the remainder of the femur
Imaging—kidneys A scalloped, curved radiolucency, seen in the kidneys 2º to chronic lower urinary tract obstruction—e.g., concrement-induced obstruction—in early phases of urography; the crescent is due to accumulation of radio-contrast material within flattened collecting tubules, and indicates residual renal function—in contrast to the rim sign, in which there is no renal function by angiography

cres·cent sign

(kres'ĕnt sīn)
1. radiography In the lung, a crescent of gas near the top of a mass lesion, signifying cavitation with a space above the debris; seen in aspergilloma, hydatidoma.
2. computed tomography A high attenuating layer of new blood in an aneurysm; indicates a ruptured abdominal aortic aneurysm
3. diagnostic ultrasound A sonolucent crescentic layer in a tumor mass, typically necrosis in stromal tumors of the small bowel.
4. diagnostic ultrasound A hyperechoic crescent, representing the entering limb of an intussusception; also known as crescent-in-a-doughnut.
5. osteoradiology A subcortical lucent crescent in the femoral head, signifying osteonecrosis
Synonym(s): meniscus sign.
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References in periodicals archive ?
Summary: MBRGI and Emirates Red Crescent sign agreement to facilitate offline educational content
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In the chest X-ray, there was a rounded prominence of the left cardiac border with the presence of a radiolucent rim at its superior aspect (crescent sign) (Figure 1).
The classic halo sign and air crescent sign are frequent in neutropenic hosts with IPA.
Pelvic radiographs (AP and frog lateral in Figures 1 and 2) were reviewed and showed avascular changes to the femoral head with the characteristic "crescent sign" of osteonecrosis, a subchondral lucency, in the femoral epiphysis.
Pulmonary aspergilloma is usually located in the upper lobes and it develops in the pre-existing cavities which has a direct communication to a bronchiole, usually sequels of tuberculosis, bullous emphysema, cysts, or cancer.[sup][3],[4] The radiological signs include air crescent sign and finger-in-glove appearance and movement of the fungus ball within the cavity when comparing upright and decubitus, which strongly suggested the diagnosis of pulmonary aspergilloma.[sup][5] The “ball-in-hole” aspect was found in our patients, but, if observed closely, we can discover that the shape of the ball in the cavity was different between the supine and prone positions.
The value of detection of rim of normal ovarian tissue in the ipsilateral adnexal masses adjacent to it i.e the Ovarian Crescent Sign (OCS), is a single USG parameter in prejudging the nature of the adnexal mass as benign or malignant.
It was attached to the Romilly Crescent sign (while I watched Argentina v Netherlands in the pub in ignorant bliss).
(8) A useful sign for differentiating a direct inguinal hernia from a fatty spermatic cord is the "lateral crescent sign" (Figure 6).
The histopathology of this transition lesion forms the basis for the analogous radiological air crescent sign, which is an imaging indicator of late IPA.
The deal, which saw Crescent sign over 49 per cent of its onshore gas concession in Sharjah, marked the first major push into the region for the Kremlin's oil arm.
Just stop next to the pharmacy (easy to recognize for the Red Crescent sign) Just opposite the pharmacy there is a small stony hill.