Spinnaker sign - a neonatal chest radiograph sign of pneumomediastinum. It refers to the thymus being outlined by air with each lobe displaced laterally like spinnaker sails. This appearance may also be termed the thymic wing sign. Bonus radiology signs also demonstrated in this case include left-sided deep sulcus sign of pneumothorax and continuous diaphragm sign of pneumomediastinum.
- Lamellated, layered or onion skin
- Codman triangle
- Spiculated, sunburst or hair on end
Although periosteal reactions may be seen in young and adult populations, the relatively loose attachment and active physiology of the periosteum in children leads to an earlier and more robust reaction to underlying pathology, and is a more sensitive indicator of disease. Lack of a periosteal reaction in adults, who have a tightly adhered and relatively inactive periosteum, is not unusual, even with highly aggressive underlying pathologies. (see the example of adult primary osteosarcoma at the bottom of this post)
Primary osteosarcoma in an adult male. Note the absence of a periosteal reaction.
The term licked candy stick appearance refers to tapering of the tips of the metacarpal / tarsal bones, phalanges or clavicles. This finding can be seen in advanced cases of:
Psoriatic arthritis: enthesitis and marginal erosions destroy the peripery of the bone, leaving a thinned central region. This also leads to the "pencil in cup deformity".
Rheumatoid arthritis: marginal erosions and destruction of the joint, due to destructive pannus, also may leave a tapered portion of bone.
Leprosy: atrophy and resorption of bone due to deinvervation, begins distally in the colder regions of the body and progresses proximally.
It's that time of year again and applications are open for the section editor 2014 positions.
Section editors are the guiding hand behind the collaborative effort of creating the largest online radiology resource on the web. As a section editor, you shape your section and maintain a high standard of content.
Being a section editor can take as little as 1 to 2 hours a week, and looks great on your CV. Your name will remain listed in the previous editors section, so that your contribution will be remembered.
- duration: ideally 12 months
- accredited radiology registrar/resident or above
- active member - the number and quality of prior contributions are a factor in selecting section editors (they also help you become familiar with the structure and workings of the site)
- maintaining and organising your section
- reviewing new additions for links and content
- contributing new articles and improvements of existing articles
- participating in discussions with other editors with regard to site-wide issues
- encouraging and providing feedback to new contributors as well as moderating new case and article contributions
- actively promoting Radiopaedia.org
Being a section editor is rewarding, is a great way to study / revise and makes a noticeable addition to your CV. You also make connections with contemporaries from around the world, which, as many of the current editors will attest to, is one of the most enjoyable aspects of this community.
To apply, email a copy of your CV and a list of the sections you are interested in editing to email@example.com. Please include your Radiopaedia.org username, so that we can review your profile and previous contributions.