原发性气管主支气管低度恶性肿瘤的CT及PET/CT表现

CT and PET/CT manifestations of primary tracheal and main bronchial low-grade malignant tumor

目的:探讨原发性气管主支气管低度恶性肿瘤的CT及PET/CT表现。方法:回顾分析28例经病理证实的原发性气管主支气管低度恶性肿瘤患者的CT、PET/CT表现及病理资料,其中粘液样表皮癌(MEC)11例,腺样囊性癌(ACC)10例及类癌7例。24例行胸部CT平扫及增强检查,3例行CT平扫,6例同时行PET/CT检查,1例仅行PET/CT扫描。结果:11例MEC,CT表现为宽基底腔内结节9例,腔内外肿块2例。10例ACC呈管壁弥漫管壁增厚5例,腔内结节4例,腔内外肿块1例。7例类癌为腔内外肿块4例,腔内结节3例。MEC与类癌均明显强化。8例ACC,轻度强化6例,中度强化2例。7例SUV值范围约2.1~8.9。结论:原发性气管主支气管低度恶性肿瘤的CT表现具有一定特征,MEC及类癌多为腔内或腔内外结节伴明显强化。ACC多为弥漫管壁浸润型伴轻度强化。SUV值均明显升高。

Objective：To investigate the CT and PET/CT features of primary tracheal and main bronchial low-grade malignant tumor. Methods： A retrospective analysis was performed on 28 cases with pathology proven primary tracheal and main bronchial low-grade malignant tumor,including mucoepidermoid carcinoma （MEC, 11 cases）, adenoid cystic carcinoma （ACC,10 cases） and carcinoid （7 cases）. 24 cases underwent CT scanning without and with contrast enhancement. 3 patients only had CT plain scan, 6 patients had CT and PET/CT and one patient just underwent PET/CT scanning. Results：Of thell cases with MEC,there were wide-base intraluminal nodule （9 cases） and intra extraluminal mass （2 cases）. Of the 10 cases with ACC,infiltrative wall thickening （5 cases） ,intraluminal nodule （4 cases）, and intra-extraluminal mass （ 1 case） were assessed. In 7 cases with carcinoid, intra-extraluminal mass （4 cases） and intraluminal nodule （3 cases） were dis played. Obvious enhancement could be revealed in all of the MEC and carcinoid tumors. In 8 cases of ACC, mild enhance ment was revealed in 6 cases and moderate enhancement in 2 cases. The maximum SUV of tumors ranged from 2.1 to 8.9. Conclusions：Certain characteristic CT manifestations of the primary tracheal and main bronchial low grade malignant tumor were revealed. Most of the MEC and carcinoid manifested as intraluminal or intra-extraluminal lesion with obvious enhance ment,and ACC manifested as infiltrative wall thickening with mild enhancement. SUV values were all increased.