1 : a surface decoration made by inlaying small pieces of variously colored material to form pictures or patterns also : the process of making it. 2 : a picture or design made in mosaic. 3 : something resembling a mosaic a mosaic of visions and daydreams and memories— Lawrence Shainberg.
What is mosaic appearance?
Introduction. Mosaic attenuation is an imaging pattern on computed tomography (CT) of the chest that is defined as variable lung attenuation that results in a heterogeneous appearance of the parenchyma.
What is mosaic lung attenuation?
Mosaic attenuation is a CT pattern defined by the Fleischner Society glossary as a. “patchwork of regions of differing attenuation seen on CT of the lungs.” It is. characterized by heterogeneous lung attenuation with well-defined borders cor- responding to the secondary pulmonary lobules.
What is mosaic pattern?
A mosaic is a pattern or image made of small regular or irregular pieces of colored stone, glass or ceramic, held in place by plaster/mortar, and covering a surface. Mosaics are often used as floor and wall decoration, and were particularly popular in the Ancient Roman world.
What causes lung attenuation?
The increased lung attenuation pattern develops when the amount of air in the airspaces and in the lumen of the airways decreases (resulting from lung volume decrease or from partial or total filling of the airspaces) and when the soft tissue structures increase in size and/or amount, two phenomena that often occur …
What causes mosaic pattern on lungs?
We have observed three categories of disease known to cause a CT mosaic pattern of lung attenuation: small-airway disease, vascular lung disease, and infiltrative disease. Diseases from each of these categories can cause similar patterns of mosaic lung attenuation on CT scans.
What is mild traction bronchiectasis?
Traction bronchiectasis is distortion of the airways secondary to mechanical traction on the bronchi from fibrosis of the surrounding lung parenchyma. Although the airways may become dilated in this situation, the other manifestations of bronchiectasis are lacking.
What is mosaic perfusion in lungs?
Mosaic perfusion (mosaic attenuation, the “mosaic lung” sign) refers to areas of decreased attenuation of lung parenchyma (↑) in the regions of reduced blood perfusion. The term “mosaic” reflects patchy distribution of abnormalities.
What is small airway disease?
Small airway disease (SAD) is a common feature in chronic obstructive pulmonary disease (COPD) patients. Chronic exposure to cigarette smoking causes inflammation, damage, tissue remodelling and eventually airway loss. These features lead to airflow limitation and defective alveolar ventilation.
Is small airway disease the same as COPD?
Small airway disease (SAD) is a recognized feature of COPD9,10,11 and has been characterized by pathology, imaging, and physiological studies. The small airways are <2 mm diameter, and there is a dramatic increase in small airway resistance in COPD patients compared to controls12. This article focuses on SAD in COPD.
What is your mosaic?
Over the last month, a TikTok trend has been a hit. It is called “my mosaic.” It is a trend where you talk about character traits or habits you have acquired because of people that have influenced you or made an impact. Every person in your life, good or bad, has made an impact; they crossed your path for a reason.
What does the name mosaic mean?
The name Mosaic is primarily a gender-neutral name of English origin that means Pattern Of Pieces. A picture or pattern produced by arranging together small colored pieces of hard material, such as stone, tile, or glass.
What is mosaic expression?
In genetics, a mosaic (or mosaicism) means the presence of two different genotypes in an individual which developed from a single fertilized egg. As a result, the individual has two or more genetically different cell lines derived from a single zygote.
What does calcification in lungs mean?
The formation of calcified granulomas in the lungs is often due to infections. These can be from a bacterial infection, such as tuberculosis (TB). Calcified granulomas can also form from fungal infections such as histoplasmosis or aspergillosis.
Can allergies scar lungs?
Repeated exposure to allergens can cause hypersensitivity pneumonitis, or inflamed lung tissue. In turn, this could lead to scarring. Workers in certain jobs have increased exposure to allergens and an increased risk of this condition.
What does lung attenuation mean?
A decrease in lung attenuation can be observed when this balance is disturbed by either an abnormal increase in the amount of air, an abnormal decrease in the intravascular blood volume with, as a result, a smaller calibre of the small vessels, and in case of loss of (interstitial) lung tissue.