Q: Which cardiac chamber is particularly enlarged and what signs are present? VIDEO ANSWER: http://goo.gl/prmEz
via our Facebook page
QUIZ: What AIDS defining chest infection do these HIV+ patients have? HINT: the infection can often result in pneumothorax, as seen on this CT. Click for ANSWER
Source: radiopaedia.org
Holly leaf sign - refers to the typical chest radiograph appearance of calcified pleural plaques. The well-defined but irregular thickened edges simulate the appearance of a holly leaf. ‘Geographic density’ is another common term used to describe their appearance. Pleural plaques are the most common form of asbestos related disease.
A MERRY CHRISTMAS TO YOU ALL from the team at Radiopaedia.org
Source: radiopaedia.org
CAVITY - a useful mnemonic for the causes of a cavitating lung mass.
C = cancer
- bronchogenic carcinoma : most frequently SCC (left image)
- cavitatory metastasis : again most frequently SCC
A = autoimmune granulomas from
- Wegener’s granulomatosis (right image)
- rheumatoid arthritis (rheumatoid nodules)
V = vascular
I = infection
- pulmonary abscess (TB, fungal, staph aureus)
T = trauma
Y = youth
Source: radiopaedia.org
Left atrial enlargement - while echocardiography has emerged as the preferred tool for assessing cardiac chamber size, recognising the features of left atrial enlargement on chest radiography remains worthwhile.
Direct signs
- The double density sign (left image) occurs when the right side of the dilated left atrium is visible next to the normal right heart border (right atrium). It may even extend out beyond the right heart border, an appearance known as atrial escape.
- Oblique measurement of greater than 7cm (right image, blue arrow).
- Convex left atrial appendage - normally it is flat or concave.
- Splaying of the carina to greater than a 90 degree angle (right image, yellow lines).
- Posterior displacement of the left main stem bronchus on lateral radiographs forming an upside down ‘V’ known as the walking man sign.
Source: radiopaedia.org
