Osler Nodes vs. Janeway Lesions
The differences between these two cutaneous presentations of Infectious endocarditis have always been a bit tricky for me. Finally I decided to solve that problem and here it is:
Osler nodes: Osler’s nodes (painful, palpable, erythematous lesions most often involving the pads of the fingers and toes). Caused by immune complexes (they want you to know that for Step 2). Infectious endocarditis and Roth spots are also due to immune complexes–>immune vasculitis.
Janeway lesions (nontender, macular lesions most commonly involving the palms and soles). Janeway lesions occur more frequently in endocarditis caused by Staphylococcus aureus. Janeway lesions are caused by septic emboli. Subcutaneous abscesses are found on histologic examination.
We can add to the picture and splinter hemorrhages aka fingernail hemorrhage: narrow, red to reddish-brown lines of blood beneath the nails. They run in the direction of nail growth and are named splinter hemorrhages because they look like a splinter beneath the fingernail. The hemorrhages may be caused by tiny clots that damage the small capillaries under the nails or by vessel damage from swelling of the blood vessels (vasculitis). [medlineplus]
The most common cause for splinter hemorrhages is trauma to the nail. [umm]
PICTURE (Credit Children’s Hospital Boston): The lesions in Figures A-C were tender and represent Osler’s nodes, while the lesion in Figure D was nontender and represents a Janeway lesion.
For more pictures showing the differences between Osler Nodes and Janeway Lesions visit er119test.
Tricky lesions indeed, thanks for reviewing them with us!
Osler nodes are not caused by immune-complexes but septic emboli as well. I do not know why Janeway lesion are non-tender though.
Hi Alberto,
I remember before you asked me how to subscribe by e-mail. I figured it out. Just click on the RSS icon and it will show you two options:one is to subscribe by RSS and the other one is by e-mail.
I have your blog in my feeds, I was suggesting a notification on comment reply via email. I’ve been setting up a wordpress blog in these days and I’ve found this plugin essential: http://txfx.net/code/wordpress/subscribe-to-comments/
Maybe you want to give it a try!
Now let me ask you: how did you put these avatar images? 🙂 Alberto
It’s me!
My picture is a gravatar, something like an universal avatar. You just go to the gravatar.com and make a registration. The rest of the people who don’t have gravatars appear as these funny icons, which is wordpress.com thing. It is automatic option, but if you want you can turn it off.
The looked at the plugin and definitely it will work but this is for wordpress.org blogs which are hosted by different webhosts. Mine is wordpress.com and I can’t use plugins.
@Alberto:I know that’s you!
Oh, ok, I understand, that is a real pitty that they don’t integrate that feature that I think is really essential to let you follow a comment thread.
Yeah, my “Alf” is a gravatar too! On the other side I can’t get these gravatars to function in my wordpress blog I have hosted
@Alberto:This one may be can help http://wordpress.org/extend/plugins/easygravatars/ or try this one http://wordpress.org/extend/plugins/wp-gravatar/.
For USMLE Step 1 purpose just identify Osler nodes in fingers and toes, while Janeway Lesions in Palms and soles.
This was really helpful. Thanks a lot for the differences!!!
Thanks for the info it was really helpful….
No problem.
some studies have described both lesions as vasculitis …
How to Remember Dukes Criteria for Infective Endocarditis:
http://tube.medchrome.com/2012/03/how-to-remember-dukes-criteria-for.html
thanks a lot .really helpful
complications?
complication?
thank you that was very helpful
Really useful, thanks!! 🙂