meniscus sign
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
Farlex Partner Medical Dictionary © Farlex 2012
Lung Air meniscus sign
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
meniscus sign
Air crescent sign Radiology A semilunar radiolucency peripheral to a pulmonary mass described as typical of echinococcal infection/hydatid cyst disease; most common cause in the US for the MS is a fungus 'ball', usually due to Aspergillus fumigatus; it may be seen in lung abscesses, tumors, hematomas, granulomatous infections and Rasmussen's aneurysm.McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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.
Synonym(s): meniscus sign.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012