<prompt> Radiolucent periapical lesions have the following exceptAbsence of lamina duraHanging drop of oil effectOpaque diffuse appearanceNo movement on cone shift  <response>: 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 