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Lung cysts are the most common mimics of lung cavities. [2] Cavities and cysts are similar in that they are both abnormal, air-containing spaces with clearly defined walls. [3] The difference between cavities and cysts is that cavities are thick walled, while cysts are thin walled. [3]
A lung cyst has a wall thickness of up to 4 mm. [2] A minimum wall thickness of 1 mm has been suggested, [2] but thin-walled pockets may be included in the definition as well. [5] A cavity has a wall thickness of more than 4 mm. [2] The terms above, when referring to sites other than the lungs, often imply fluid content.
Thin-walled cystic change in the lungs may be found incidentally on CT scans of the heart, chest or abdomen (on the cuts that include lung bases) obtained for other purposes. HRCTs of TSC patients reveals that about 20% of women have cystic change by age 20 and about 80% of women have cystic changes after age 40. [ 79 ]
A lung cyst, or pulmonary cyst, encloses a small volume of air, and has a wall thickness of up to 4 mm. [3] A minimum wall thickness of 1 mm has been suggested, [3] but thin-walled pockets may be included in the definition as well. [4] Pulmonary cysts are not associated with either smoking or emphysema. [5]
Their walls are thin, being less than 1 mm thick. If they rupture, they allow air to escape into pleural space, resulting in a spontaneous pneumothorax and possibly a collapsed lung. [1] [2] Blebs can grow larger or join together to create a larger cyst, or bulla. There are usually no symptoms unless a pneumothorax occurs or the bulla grows ...
Lymphangiomatosis is a condition marked by the presence of cysts that result from an increase both in the size and number of thin-walled lymphatic channels that are abnormally interconnected and dilated. [2] [3] [4] 75% of cases involve multiple organs. [2]
CT scan in a patient with usual interstitial pneumonia, showing interstitial thickening, architectural distortion, honeycombing and bronchiectasis.. In radiology, honeycombing or "honeycomb lung" is the radiological appearance seen with widespread pulmonary fibrosis [1] and is defined by the presence of small cystic spaces with irregularly thickened walls composed of fibrous tissue.
The thin, fibrous wall circumscribing the tumor is highly characteristic of this lesion. [4] It can sometimes occur within a pulmonary bronchocele, and this tumor entity should be kept in mind after identification of a bronchocele with suspicious or non-prototypical imaging characteristics. [10] [11]