巧克力囊肿与囊性畸胎瘤的低场MRI鉴别诊断

Study on significance of low-field MRI in differential diagnosis of chocolate cyst and cystic teratoma

目的探讨巧克力囊肿与囊性畸胎瘤的低场MRI鉴别诊断。方法收集10例巧克力囊肿与6例囊性畸胎瘤的低场MRI资料,进行回顾性分析,所有病例均经手术病理证实。结果 10例巧克力囊肿共13个病灶中有9个病灶在短时反转恢复(STIR)脂肪抑制序列出现信号抑制征象。与6例囊性畸胎瘤内脂肪成分在STIR脂肪抑制序列上表现类似。结论在低场MRI上盆腔囊性占位中观察到短T1、长T2信号,STIR出现信号抑制现象时,就存在巧克力囊肿与囊性畸胎瘤的鉴别问题。综合分析病灶内部结构、增强扫描表现以及临床特点,可以作出鉴别诊断。

Objective To study the significance of low-field MRI in differential diagnosis of chocolate cyst and cystic teratoma.Methods The data of low-field MRI findings in 10 cases of chocolate cyst and 6 cases of cystic teratoma confirmed by operation and pathological examination were retrospectively analyzed.Results It had been observed that the signal was suppressed in short time inversion recovery（STIR） sequence in 9 lesions of 13 chocolate cysts in 10 cases,and it was similar to fat in 6 cases of cystic teratoma.Conclusion The application of low-field MRI in differential diagnosis of chocolate cyst and cystic teratoma should be considered when the cystic mass in pelvic with short T1,long T2 and signal suppression in STIR sequence were observed.The differential diagnosis can be made with internal composition,the performance of enhanced examination and clinical characteristics.