This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Radiolucent periapical lesions have the following except 
Select and explain. 
A. Absence of lamina dura, B. Hanging drop of oil effect, C. Opaque diffuse appearance, D. No movement on cone shift
C: Opaque diffuse appearance
Answer: C: Opaque diffuse appearance 
Explanation: The features of periapical inflammatory lesions vary depending on the time course of the lesion. More chronic lesions may show lytic (radiolucent) or sclerotic (radiopaque) changes, or both. The lamina dura around the apex of the tooth usually is lost. 
In most instances, the periphery of periapical inflammatory lesions is ill defined, showing a gradual transition from the surrounding normal trabecular pattern into the abnormal bone pattern of the lesion. In chronic cases, the new bone formation may result in a very dense sclerotic region of bone, obscuring individual trabeculae. 
 
Oral radiology ; White and Pharaoh 7th edition page no 316-317