I wish I knew what you needed this for. I found many different web sites that list the different types of cancers alphabetically. All the sites skip the letter D. At the end of this entry you will find some of the websites I found and utilized.
After looking I was able to find one tumor that could be cancerous or not. I was able to find Desmoplastic infantile ganglioglioma (DIG). Desmoplastic infantile ganglioglioma is a rare type of brain tumor that occurs during childhood. It occurs when cells begin to grow abnormally and create a mass. This mass can be benign or malignant. Desmoplastic infantile ganglioglioma is a typy of glioma. This means it forms from glial cells. It is most likely present before birth.