Swap your description in the CDATA comments and embed the image as HTML <img> tags.
TechCrunch has examples you can work with: http://feeds.feedburner.com/TechCrunch
For example, from their current feed, the first item on UK entrepreneurs using the following description tag:
<description> <![CDATA[ <img src="http://eu.techcrunch.com/wp-content/uploads/startupbritain.jpg" alt="" /> This morning in London, the UK answer to <a href="http://www.whitehouse.gov/issues/startup-america"> Startup America</a> launches, titled - guess what? - <a href="http://www.startupbritain.org/">Startup Britain</a>. That similarity aside, the initiative has been put together by a number of existing UK entrepreneurs and is not being backed by any government money, unlike the Obama initiative. Instead, we have here a ground-up entrepreneur-led initiative which is seeing over 60 leading brands offer services to up-and-coming startups in the UK. This is not specifically about tech startups - but it may well appeal to that sector. The campaign is being launched by Prime Minister David Cameron, who is known to be very pro-enterprise. The UK has 270,000 businesses that start up every year but many fail due to a lack of support. So in effect the Startup Britain initiative is doing a few things much more differently. It offering a package of discounts and free trial on business services like insurance, broadband, advertising, office space and more. The claim is that this amounts to over £1,500 in value for every startup company in Britain. Startup Britain is a portal site to a package of these services. <img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=techcrunch.com" width="1" height="1" /> ]]> </description>
Treffynnon
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