Periphery :

The periphery of the lesions can be Well-Defined or ill-Defined

Well-Defined Borders 

” A Well-Defined lesion is one in which most of the periphery is well-defined . these type of lesions may have one of these below peripheries “

For example : Multiple Myeloma has Punched-out border . 

“A punched-out border is one that has a sharp boundary or a very narrow zone of transition in which no bone reaction is apparent immediately adjacent to the abnormality. “ (more examples)

For example : This Lesion has Corticated border .

 ” A corticated margin is a thin , fairly fairly uniform radiopaque line of reactive bone at the periphery of a lesion . ”  (more examples)

For example : Periapical Osseous Dysplasia Has Sclerotic border .

” A sclerotic margin represents a wider zone of transition made up of a thick radiopaque border of reactive bone that usually is not uniform in width .” (more examples)

For example : Cementoblastoma has Soft tissue capsule .

” A radiopaque lesion may have a soft tissue capsule , which is indicated by the presence of a radiolucent line at the periphery .”  (more examples)

Ill-Defined Borders 

 ” An ill-defined lesion is one in which drawing periphery of it’s exact delineation ; is difficult . these type of lesions may have two kinds of periphery “


For example : Sclerosing osteitis has Blending border .

” A blending border is a gradual , often wide zone of transition between the adjacent normal bone trabeculae and the abnormal appearing trabeculae of the lesion . ” (more examples)


For example : Squamous cell carcinoma has Invasive border .

” An ill-defined invasive border appears as an area of radiolucency with few or no trabeculae representing bone destruction just behind and at the leading margin of the lesion and usually has a wide zone of transition.” (more examples)

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