This most likely represents an incidental haemangioma.    From Wordnik.com.  [sierrazen Diary Entry] Reference

Her daughter Anna was born premature and diagnosed with a haemangioma, a condition commonly known as a strawberry birthmark, in her trachea.    From Wordnik.com.  [KWTX - HomePage - Headlines] Reference

The word Birthmark is a common term used to describe the various birthmark types of which port wine stain, haemangioma and congenital melanocytic naevus are all examples.    From Wordnik.com.  [Netvouz - new bookmarks] Reference

May be associated with haemangioma (maffuci's c.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference