儿童臀肌挛缩症的CT诊断

目的探讨儿童臀肌挛缩症的CT表现。方法对6l例经CT诊断为臀肌挛缩症，并经手术病理证实的患儿进行研究，并与20例正常臀肌的CT表现作对照。结果在61例臀肌挛缩症中，57例(93．4％)是双侧挛缩，4例(6．6％)是单侧；CT主要表现：(1)臀肌体积缩小，118侧(100．0％)臀大肌体积缩小，16侧(13．6％)臀中肌体积缩小；12侧(10．2％)梨状肌体积缩小；4侧(3．4％)臀小肌体积缩小；4侧(3．4％)髋关节后方关节囊挛缩。(2)注射点区臀肌钙化、坏死。95侧(80．5％)臀肌有钙化，24侧(20．3％)臀肌有斑片状坏死。(3)条索状挛缩带，81条位于臀大肌外侧，从臀大肌外上缘到髂筋束，36条位于臀大肌骶骨侧。(4)肌间隙增宽，轻度38侧(32．2％)，中度53侧(44．9％)，重度27侧(22．9％)。结论CT扫描能正确诊断臀肌挛缩症，明确病变范围及程度，对术前评估有重要价值。

CT diagnosis of gluteal muscle contracture in children

Objective To investigate the CT manifestations of gluteal muscle contracture (GMC) in children.Methods Sixty-one cases of GMC diagnosed by CT and proved by surgery and pathology were studied with 20 cases of non-GMC as the control group.Results 57 cases (93.4%) were bilateral contracture and 4 cases (6.6%) were unilateral contracture in 61 cases of GMC; The main CT manifestations were as follows: (1) gluteal muscle volume shrunk.there were 118 (100.0%) sides of gluteus maximus contracture,16 (13.6%) sides of gluteus medius contracture,12 (10.2%) sides of piriformis contracture,4 (3.4%) sides of gluteus minimus contracture,4 (3.4%) sides of capsula articularis contracture; (2) calcification and necrosis in injection zones.There were 95(80.5%) sides of gluteal calcification and 24(20.3%) sides of gluteal necrosis; (3) stripe crispation fascia.There were 81 stripes crispation fascia located outboard laterals of gluteus maximus,36 located inboard laterals of the latter; (4) gluteal muscle clearance widened.There were 38 (32.2%) sides of light degree gluteal muscle contracture,53 (44.9%) sides of middle degree,and 27 (22.9%) sides of heavy degree.Conclusion CT can accurately diagnose GMC and it plays an important role in the evaluation of pathological extent and degree of GMC.