The Comparative Analysis Of Bone Tumor And Tumor-like Lesions In The Flat Bone Of The Shoulder Girdle And Pelvic Girdle

Objective： To analyze the distribution characteristics and imagingfeatures of tumors and tumor-like lesions of scapula.Methods：49cases of lesions confirmed by pathology in the scapula wereretrospectively analyzed from2007to2011，their distribution and imagingcharacteristics were analyzed.Results: a total of49cases of scapula lesions were found, including15types of pathological lesions, benign tumors in22cases (44.9%), tumor-likedisorders in6cases(12.2%), malignant tumors in21cases(42.9%).Osteochondroma was the most common benign tumor (17cases,accounting for77.3%of the scapula benign tumors), the second one waschondroma（2cases). The eosinophilic granuloma and intraosseous ganglioncyst were the two common tumor-like disorders, in each of the2cases.Malignant tumors most commonly were metastatic tumors (12cases,accounting for57.1%of the scapula malignant tumors), the second mostcommon one was chondrosarcoma (4cases,44.4%of primary malignantscapular tumors).All of the cartilage tumors were located in the zone ofscapular body(Zone B), except for1case of chondroblastoma involving zoneadjacent to articular area(Zone A). The distribution of lesion types in thescapular body was almost similar with that in the bone process(acromion andcoracoid). The common lesions in central area of the body were malignanttumors while in marginal zone were benign cartilage tumors. The mostcommon lesions in glenoid area were metastases, and the intraosseousganglion cyst was the characteristic benign lesion in this area. The commonsigns of scapula malignant tumors were obscure boundary, cortex destructionand soft tissue involvement. Image signs for malignant tumors lacked specificity except calcification within the chondrosarcomas. The benignlesions of scapula usually showed clear boundary and marginal sclerosis.Conclusion: scapula bone tumors and tumor-like lesions are relativelyrare, common types are cartilage tumors and metastasis. The location anddistribution of different types of lesions in scapula are similar to those of longbones in some degree. Objective： To analyze the distribution characteristics and imagingfeatures of tumors and tumor-like lesions of ilium.Methods：91cases of lesions confirmed by pathology in the ilium wereretrospectively analyzed from2007to2011; their distribution and imagingcharacteristics ware researched..Results: a total of91cases of ilium lesions were involved, including22types of pathological lesions. There were19cases of benign tumors (20.9%),8cases of tumor-like disorders（8.8%), and64cases of malignant tumors(70.3%).Osteochondroma was the most common benign tumor (6cases,accounting for31.6%in the ilium benign tumors cases), followed by giant celltumour(4cases) and hemangioma（2cases). The fibrous dysplasia was themost common tumor-like disorder (5cases, accounting for62.5%in the iliumtumor-like lesions cases). Metastatic tumors were the main malignant tumors(31cases, accounting for48.4%in the ilium malignant tumors cases),followed by chondrosarcoma and osteosarcoma (7cases each,21.2%inprimary malignant ilium tumors cases). The lesions in Zone B were markedlymore than those in Zone A (53:28).The range of benign bone tumors andtumor-like lesions was relatively small, so it was not classified in the zoneincluding ilium body and articular area(Zone A+B). The malignant bonetumors in Zone A had high proportion (22:28). Metastases are distributed in tZone A and Zone B, and6cases are extended in a large area. The image signs of ilium malignant tumor are ill-defind boundary, cortex destruction, and softtissue spreading. The sign of sunburst periosteal reaction was seen inchondrosarcoma, osteosarcoma and Ewing’s sarcoma. The specific cartilagecalcification could be observed in chondrosarcoma, while other malignantbone tumors generally were lack of characteristic imaging features. Mostbenign lesions in ilium had clear margin, and often circulated by sclerotic rim.Conclusion: Ilium bone tumors and tumor-like lesions are not rare,whereas cartilage tumors and metastasis are the most common types. Thelocation and distribution of different types of lesions have different bias andcharacteristics in ilium. Objective：By analyzing the distribution characteristics and imagingfeatures of tumor and tumor-like lesions of shoulder girdle and pelvis girdle,evaluated the sex and age distribution and laws of shoulder girdle and pelvisgirdle bone tumor incidence.Methods：49cases of scapula and91cases of ilium confirmed bypathology were found.The lesions were retrospectively analyzed from2007to2011，and their distribution and imaging characteristics were researched.Results: There were15kinds of shoulder blade lesion cases, included inall49cases (22cases of benign tumors,6cases tumor-like lesions, and21cases of malignant tumor). There were22kinds of iliac bone lesions, includedin the91cases (19cases are benign tumors,8cases are tumor-like lesions and64cases of malignant tumor). The osteochondroma was the most commonkind in benign tumors. The total cases of osteochondroma and the ratio of thenumber of cases of osteochondroma to all cartilaginous tumors in the scapulawas higher than in the ilium (the former17:22,77.3%; latter6:19,31.6%).Metastasis was the most common malignant tumors. The ratio of metastasis to all malignant tumors in the scapula was higher than that in the ilium (theformer12:21,57.1%; latter31:64,48.4%). Primary malignant tumors werechondrosarcoma predilection. The ratio of chondrosarcoma to primarymalignant tumors in the scapularwas higher than in the ilium (the former4:9,44.4%; latter7:33,21.2%). The ratio of osteosarcoma, Ewing’s sarcoma,haematopoietic tumours(myeloma, lymphoma and granulocytic sarcoma) andthe occurrence of vascular tumors (hemangioma and angiosarcoma) in theilium was higher than that in the scapula. Gender and age distribution of thescapula and ilium lesions were basically the same, but most of the lesionsoccurred more in male than in female. The majority of benign bone tumor andtumor-like cases was less than40years old, while the most cases of malignantbone tumors were more than40years old. The malignant tumors were morecommon in Zone A, especially metastases, which almost were same in iliumand scapula. All of scapular cartilaginous tumors were located in Zone B;whereas less cases of iliac chondrosarcoma presented in Zone A, benigncartilaginous tumors were located in Zone B. The well-defined boundary andsclerotic rim of the lesions in the articular region were characteristic imagingmanifestations of benign tumors.Conclusion: The lesion kinds and the tumor incidence in scapular islower than those in the ilium, and the gender and age distribution in these boneare similar. The age of patients with benign bone tumors and tumor-likelesions are generally lower than that with malignant bone tumors. The mostcommon malignant tumors are metastasis followed by chondrosarcoma, themost common benign bone tumors are osteochondroma. Chondrogenic tumorincidence and the proportion in scapular is more than those in the ilium. Theincidence of hematologic malignancies and vascular tumors in the ilium arehigher than in the scapula. Most cases of lesions occur in Zone B, especiallybenign bone tumors. It’s difficult to make an accurate diagnosis only byimaging appearances, but it can show a useful diagnostic clues.