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What is Radiolucent periapical lesions have the following except and explain in detail?
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