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目的 探讨胰岛细胞瘤与胰岛细胞增生症平扫与增强的影像特点。方法 分析经手术与病理证实的胰岛细胞瘤 6例 (其中多发性 3例 )、胰岛细胞增生症 1例的 MRI影像特点 ,并与 B超对比。按功能分类 :本组中胰岛素瘤 5例 ,胰岛素细胞增生症 1例 ,胰高血糖素瘤 1例。扫描序列 :常规行 SE/ TSE:T1 WI、T2 WI,部分加行脂肪抑制的 T1 WI与 T2 WI,行 Gd- DTPA常规增强 T1 WI。结果 (1)胰岛素瘤 :形态呈类圆形或卵圆形 ,最大径为 1.0～ 2 .5 cm ,常规 T1 WI呈略低信号 ,边界不清 4 / 5 ,其中 2例加行 fs- T1 WI后病灶边界变清 ;常规 T2 WI呈高信号 4 / 5 ,边界清(其中 1例行 fs- T2 WI病灶边界更清 ) ,呈等信号 1/ 5 ,边界不清 ;常规增强呈等信号 2 / 5 ,强化不明显呈略低信号 2 / 5 ,不均匀强化 1/ 5。 3例 (3/ 5 )各有两个瘤体 ,但术前 MRI均漏诊 1个病灶。 5例 8个病灶中 B超仅检出 1个病灶 ,呈低回声。 (2 )胰岛素细胞增生 :呈卵圆形结节状外突 ,最大径为 1.5 cm,呈等 T1 等 T2 信号 ,与胰腺分界不清 ,B超未检出病灶。 (3)胰高血糖素瘤 :呈卵圆形 ,最大径为 8cm,呈混杂信号 ,以长 T1 长 T2 信号为主 ,间有斑状短 T1 略短T2 信号 ,常规增强呈稍不均匀强化 ,在 T1 WI与 T2 WI上有完整的线状低信号包膜。B超呈?
Objective To investigate the imaging features of islet cell tumor and islet cell hyperplasia. Methods The MRI features of 6 cases of pancreatic islet cell tumor confirmed by operation and pathology (3 cases were multiple) and 1 case of islet cell hyperplasia were analyzed and compared with those of B ultrasound. According to the functional classification: 5 cases of insulinoma in this group, 1 case of insulin-like cell hyperplasia, 1 case of glucagonoma. Scanning sequence: conventional line SE / TSE: T1 WI, T2 WI, partial fat suppression T1 WI and T2 WI, Gd-DTPA routine enhanced T1 WI. Results (1) Insulinoma: the morphology was round or oval, the maximum diameter of 1.0 ~ 2.5 cm, conventional T1 WI was slightly lower signal, the border is unclear 4/5, of which 2 cases plus line fs- T1 After WI, the border of the lesion became clear; in the routine T2 WI, the high signal was 4/5, and the border was clear (in 1, the border of fs-T2 WI was clearer), the signal was equal to 1/5, the border was unclear; 2/5, slightly less obvious enhancement signal was slightly 2/5, 1/5 unevenly enhanced. Three cases (3/5) each had two tumors, but missed a preoperative MRI lesions. Five cases of 8 lesions in B-only detected a lesion, hypoechoic. (2) Insulin cell hyperplasia: oval nodular outreach, maximum diameter of 1.5 cm, was T1 and other T2 signals, clear boundaries with the pancreas, B-not detected lesions. (3) glucagonoma: oval-shaped, the maximum diameter of 8cm, was mixed signal to the long T1 long T2 signal mainly short T2 slightly short spot signal between the T2, the conventional enhancement was slightly uneven enhancement, There is a complete linear low signal envelope on T1WI and T2WI. B super was?