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CAVITY – a useful mnemonic for the causes of a cavitating lung mass.

C = cancer
CAVITY – a useful ... mnemonic for the causes ... of a cavitating lung ... mass. ... #Differential #Lung
Radiologists use many terms to describe areas of decreased density or lucencies within the lung, like
lucencies within the lung ... , like cyst, cavity ... since in many cases ... we describe a chest ... visible wall #CXR
Lungcancer
10% of lungcancers cavitate, most commonly squamous cell carcinoma.
Small cell lungcancer does not cavitate.
Bronchoalveolar carcinoma, or
Here a chest x-ray ... large cavitating lung ... started as a small mass ... Clinical #Radiology #CXR ... LungCancer #Cancer #Cavity
Chronic Cough - Differential Diagnosis Algorithm
Red Flags:
 • Fever, night sweats, chills (infection)
 • Weight loss,
Dyspnea (underlying lung ... lymadenopathy, clubbing, chest ... ) • Abnormal CXR ... History of cancer, lung ... Diagnosis #Algorithm #causes
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
in interstitial lung ... On a Chest X-Ray ... is interstitial lung ... On a CXR the most ... seen and in many cases
Here are the most common examples of these four patterns on a chest x-ray (click image
patterns on a chest ... opacities Nodule or mass ... Nodule - Multiple Masses ... Clinical #Radiology #CXR
Cardiac incisura
Click image to enlarge.
On the right side of the chest the lung will lie against
right side of the chest ... the lung will lie ... inferior part of the lung ... This causes a density ... Clinical #Radiology #CXR
Septic emboli
Septic emboli usually present as multiple ill-defined nodules.
In about 50% cavitation is seen.
CT demonstrates more
lesions than the chest ... The chest film shows ... densities iin the left lung ... Clinical #Radiology #CXR ... #SepticEmboli #Cavity
Lung Abscess - Diagnosis and Management Summary

Lung Abscess Etiology:
 • Necrosis of lung parenchyma by a
• Most common cause ... disease: Pleuritic chest ... Blood cultures • CXR ... early disease) • CXR ... level seen • Chest
Mucoid impaction
Mucus plugs or mucoid impaction can mimick the appearance of lung nodules or a mass.
Sometimes
appearance of lung ... nodules or a mass ... bronchial obstruction caused ... are some mass-like ... Clinical #Radiology #CXR