<prompt> Which of the following is not a type I Geographic lesion of bone -Fibrous dysplasiaBrodies abscessGiant cell tumorEwings sarcoma  <response>: Ans. is d i.e., Ewings sarcoma Patterns of bone destruction: Bone tumors can be categorized into several groups according to their pattern of destruction and margin.A Geographic Lesion Type I - is characterized by a uniformly destroyed area within a sharply defined border. Geographic lesions are further divided into three groups according to their margins:i Geographic lesion with sclerotic margin: type IA,ii Geographic lesion with well-defined border without sclerotic rim: type IB,iii Geographic lesion with ill-defined border: IC.B The term moth eaten Type II is used to define lesions with clustered multiple small osteolytic areas.C Finally permeative lesions Type III are those with ill-defined areas of lytic bone destruction.Pattern of bone destructionType IAGeographical lesion with sclerotic marginType IBGeographical lesion with well-defined border but without sclerotic rimType ICGeographical lesion with an ill-defined borderSimple bone cystChondrolblastomaFibrous dysplasiaIntraosseous lipomaNonossifying fibromaBrodie abscessAneurysmal bone cystGiant cell tumorChondrosarcomaType IIMoth-eatenType IIIpermeative Ewings sarcomaLangerhans cell histiocytosisOsteosarcomaMyelomaSmall round cell tumorslymphomEwings sarcomaAcute osteomyelitis 