Common Lesions Misdiagnosed as Malignancy

It's often difficult to interpret a finding on a CT scan. The following article gives a list of common lesions that are benign but can look like malignant ones:

http://www.appliedradiology.com/Issues/2012/02/Articles/AR_02-12_Phillips/Mimics-of-neoplasia--Common-lesions-and-findings-misdiagnosed-as-malignancy.aspx