What causes a mosaic pattern in the lungs?
Vascular causes resulting in mosaic attenuation are typically chronic thromboembolic pulmonary hypertension, which is characterized by organizing thrombi in the elastic pulmonary arteries, or pulmonary arterial hypertension, a heterogeneous group of diseases affecting the distal pulmonary arterioles.
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 pulmonary mosaicism?
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 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.
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 the description of mosaic?
mosaic, in art, decoration of a surface with designs made up of closely set, usually variously coloured, small pieces of material such as stone, mineral, glass, tile, or shell. Once disassembled, a mosaic cannot be reassembled on the basis of the form of its individual pieces.
What is genetic mosaicism and how does it arise?
Mosaicism occurs when a person has two or more genetically different sets of cells in his or her body. If those abnormal cells begin to outnumber the normal cells, it can lead to disease that can be traced from the cellular level to affected tissue, like skin, the brain, or other organs.
What is the mosaic period?
The Mosaic age lasted from the giving of the Law at Mount Sinai until Jesus died (a period of nearly 1,600 years). Thus, the Mosaic Law is NOT in effect today. Christians need NOT obey its 613 laws and regulations. The entirety of the Old Testament Law of Moses was fulfilled by Jesus’ sacrifice and nailed to the cross.
What are symptoms of small airway disease?
Small airways disease may show direct or indirect signs on a CT scan [20]. Direct signs of small airways disease include ill-defined centrilobular nodules and well-defined centrilobular branching nodules, also called tree-in-bud opacities, which may be best seen using MIP.
How is small airway disease diagnosed?
The earliest indication of small airway disease when evaluated by spirometry is the deceleration of airflow at the terminal portion of the flow-volume curve, which can be detected by measuring the mean expiratory flow between 25% and 75% of FVC (FEF25–75%) [10. Interpretative strategies for lung function tests.