摘要
目的分析~(99m)Tc-HYNIC-TOC单光子发射计算机断层显像(SPECT)结果阴性的瘤源性骨软化症(TIO)致病肿瘤的~(68)Ga-DOTA-TATE正电子发射断层显像/计算机断层显像(PET/CT)的图像特征,探讨其对致病肿瘤准确定位的指导价值。方法纳入37例经临床及病理确诊的~(99m)Tc-HYNIC-TOC SPECT显像结果阴性的TIO患者,回顾性分析致病肿瘤的~(68)Ga-DOTA-TATE PET/CT图像特点。结果 37例TIO患者致病肿瘤均为单发,术后病理包括35例磷酸盐尿性间叶组织肿瘤和2例梭形细胞瘤。所有TIO致病肿瘤~(68)Ga-DOTA-TATE PET/CT上均表现为放射性浓聚灶,标准化摄取最大值和标准化摄取平均值分别为7. 2±4. 3和4. 3±2. 4,平均最大径为(1. 9±0. 7) cm。37例TIO致病肿瘤,最常见发病部位为下肢(19/37),其次为躯干(11/37)、上/下颌骨(5/37)及上肢(2/37)。24例位于骨组织病灶,最常位于下肢长骨(13/24),多呈偏心性生长(8/13),3例累及骨皮质,同机CT以局限性溶骨性骨质破坏多见(14/24),部分呈骨质硬化型改变(9/24),较少累及周围软组织。13例位于软组织病灶,多呈边界清楚等或低密度结节(10/13),1例位于胸膜病灶伴钙化。结论 ~(68)Ga-DOTA-TATE PET/CT能够检出~(99m)Tc-HYNIC-TOC SPECT漏诊的TIO病例。若生长抑素受体高度表达病灶局部见溶骨性或硬化型骨质改变、软组织内等或低密度结节,更倾向于TIO的诊断。
Objective To analyze ~(68)Ga-DOTA-TATE positron emission tomography/computed tomography( PET/CT) imaging features of tumor-indud osteomalacia( TIO) patients with negative ~(99m)Tc-HYNIC-TOC single photo emission computed tomography( SPECT) findings and to investigate the value of ~(68)Ga-DOTA-TATE PET/CT in accurate localization of culprit tumors. Methods We retrospectively analyzed ~(68)Ga-DOTA-TATE PET/CT imaging features including location,size,density,the maximum and mean standardized uptake value in 37 TIO patients with negative ~(99m)Tc-HYNIC-TOC SPECT findings. Results Totally 37 solitary TIO tumors,including 35 phosphaturic mesenchymal tumors and 2 spindle cell tumors confirmed by pathological examinations,were detected via ~(68)Ga-DOTA-TATE PET/CT scans in the included 37 cases. These 37 TIO tumors showed obviously increased activities,with an maximum standardized uptake value of 7. 2 ± 4. 3 and mean standardized uptake value of 4. 3 ± 2. 4. The average maximum diameter was( 1. 9 ± 0. 7) cm. The majority of the tumors occurred in the lower extremities( 19/37),followed by the trunk( 11/37),maxillary/mandibular bone( 5/37),and upper extremities( 2/37). In addition,24 bone lesions were located in long bones of lower extremities( 13/24), most of which demonstrated eccentric growth( 8/13). Osteolytic changes( 14/24) were observed mainly in the lesions via the corresponding CT imaging; meanwhile,sclerotic changes presented in nine cases. Of the 13 soft-tissue lesions,the majority( 10/13) showed well-circumscribed isodense or hypodense nodules on the CT images,with spot calcification in one lesion located in the pleura. Conclusions ~(68)Ga-DOTA-TATE PET/CT scans can detect the TIO culprit tumors miss-diagnosed by ~(99m)Tc-HYNIC-TOC SPECT. Somatostatin-receptors highly expressed lesions with focal osteolytic or osteosclerotic change in bone and isodense or hypodense nodules in soft tissue will favor the diagnosis of TIO tumors.
引文
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