What is a meniscus sign on a chest xray?
In chest roentgenograms, the pulmonary meniscus sign is a crescent-shaped inclusion of air surrounded by consolidated lung tissue. The common cause is aspergilloma. A hydatid cyst is, however, the most common cause in endemic areas.
What is the air crescent sign?
An air crescent sign describes the crescent of air that can be seen in invasive aspergillosis, semi-invasive aspergillosis, or other processes that cause pulmonary necrosis. It usually heralds recovery and is the result of increased granulocyte activity.
What causes a meniscus sign?
A torn meniscus can result from any activity that causes you to forcefully twist or rotate your knee, such as aggressive pivoting or sudden stops and turns. Even kneeling, deep squatting or lifting something heavy can sometimes lead to a torn meniscus.
What is meniscus sign of pleural effusion?
Pleural effusions Fluid gathers in the lowest part of the chest, according to the patient’s position. If the patient is upright when the X-ray is taken, then fluid will surround the lung base forming a ‘meniscus’ – a concave line obscuring the costophrenic angle and part or all of the hemidiaphragm.
What is halo sign?
The halo sign in chest imaging is a feature seen on lung window settings, ground glass opacity surrounding a pulmonary nodule or mass and represents hemorrhage. It is typically seen in angioinvasive aspergillosis.
What is Cervicothoracic sign?
The cervicothoracic sign is a variation of the silhouette sign on frontal chest radiography used to determine whether a superior (para)mediastinal soft tissue mass is anterior or posterior to the trachea.
What is meniscus sign on pleural effusion Xray?
What is meniscus?
The meniscus is a c-shaped pad of cartilage in the knee that acts as a shock absorber. Each knee has two menisci. Meniscus tears are common knee injuries. Knee arthroscopy is often used to treat meniscal tears.
What is a meniscus?
Which radiological sign is a good indicator of a pleural effusion?
Plain radiograph. Chest radiographs are the most commonly used examination to assess for the presence of pleural effusion; however, it should be noted that on a routine erect chest x-ray as much as 250-600 mL of fluid is required before it becomes evident 6.
What is Battle’s sign?
A Battle sign, or Battle’s sign, is a bruise that indicates a fracture at the bottom of the skull. At first, it can look just like a typical bruise that could heal on its own. However, Battle’s sign is a much more serious condition. The type of fracture that causes Battle’s sign is considered a medical emergency.
What causes a halo sign?
The halo sign and reversed halo sign are most commonly associated with invasive pulmonary aspergillosis and pulmonary mucormycosis, respectively. Many other infections and noninfectious conditions, such as neoplastic and inflammatory processes, may also manifest with pulmonary nodules associated with either sign.
What is extrapleural sign?
The extrapleural sign, described by Ben Felson in 1973 1, refers to the appearance of a pulmonary opacity with oblique margins that taper slowly to the chest wall when the lesion is viewed tangentially to the x-ray beam.
What is the silhouette sign?
In radiology, the silhouette sign refers to the loss of normal borders between thoracic structures. It is usually caused by an intrathoracic radiopaque mass that touches the border of the heart or aorta.
Where is meniscus located?
The menisci sit between the tibia (lower leg bone) and the femur (thigh bone) and protect the lower part of the leg from the shock created by our body weight. The medial meniscus sits on the inside of the knee and the lateral meniscus sits on the outside of the knee.
Why is meniscus important?
The meniscus plays a vital role in maintaining the stability of the knee joint along with optimizing the tibiofemoral load transfer and distribution. This also helps in preserving the health of the articular cartilage.
What is a positive Battle sign?
Battle sign is often present with a basilar skull fracture. The presence of Battle sign correlates with a positive predictive value of greater than 75% for the presence of an associated basilar skull fracture.
Is a halo sign normal?
CONCLUSION. In the absence of clinical or radiologic evidence of inflammatory bowel disease, the presence of the fat halo sign may represent a normal finding that is possibly re- lated to obesity.
What does the halo sign look like?
In radiology, the halo sign is a finding of a dark halo around the arterial lumen on ultrasound that suggests the diagnosis of temporal arteritis. The standard diagnostic test for temporal arteritis is biopsy; however, ultrasound and MRI show promise for replacing it.