Purpose

To assess MR imaging findings of low-grade serous carcinoma (LGSC) of the ovary compared with those of serous borderline tumor (SBT).

Methods

Twenty-four patients with histopathologically proven 7 LGSCs and 25 SBTs who underwent preoperative MR imaging were included. We retrospectively reviewed MR images and compared MR findings between the two pathologies.

Results

The predominantly solid lesions were marginally more frequent in LGSCs than in SBTs (43% vs. 8%, p = 0.057). All predominantly cystic LGSCs were multilocular cystic lesions with mural nodules. Predominantly solid LGSCs exhibited pure solid masses in 2 of 3 and solid masses with intratumoral cysts in 1 of 3. Papillary growth pattern with internal branching was observed only in 18 of 25 SBTs. Signal intensity ratio on T2-weighted images (4.48 ± 1.55 vs. 8.40 ± 3.53, p < 0.01) and apparent diffusion coefficient (ADC) values (1.12 ± 0.21 vs. 1.73 ± 0.27 × 10⁻³ mm²/s, p < 0.01) of solid components was significantly lower in LGSCs than in SBTs.

Conclusion

Compared with SBTs, lower signal intensity on T2-weighted images and lower ADC values were characteristic features of solid components in LGSCs. Papillary growth pattern with internal branching was not observed in LGSCs.

中文翻译：

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卵巢低级别浆液性癌的 MR 影像表现：与浆液性交界性肿瘤的比较。

目的

评估卵巢低级别浆液性癌 (LGSC) 与浆液性交界性肿瘤 (SBT) 的 MR 成像结果。

方法

包括 24 名经组织病理学证实的 7 例 LGSC 和 25 例 SBT 的患者，这些患者接受了术前 MR 成像。我们回顾性审查了 MR 图像并比较了两种病理之间的 MR 结果。

结果

LGSCs 中主要为实性病变的频率略高于 SBTs（43% 对 8%，p  = 0.057）。所有以囊性为主的 LGSC 均为多房囊性病变，伴有壁结节。以实性为主的 LGSC 在 3 个中的 2 个中表现出纯实性肿块，在 3 个中的 1 个中表现出具有瘤内囊肿的实性肿块。仅在 25 个 SBT 中的 18 个中观察到具有内部分支的乳头状生长模式。T2 加权图像上的信号强度比（4.48 ± 1.55 对 8.40 ± 3.53，p  < 0.01）和表观扩散系数 (ADC) 值（1.12 ± 0.21 对 1.73 ± 0.27 × 10 ^-3 mm ² /s，p  < 0.01) 固体成分在 LGSCs 中显着低于在 SBTs 中。

结论

与 SBT 相比，T2 加权图像上较低的信号强度和较低的 ADC 值是 LGSC 中固体成分的特征。在 LGSC 中未观察到具有内部分支的乳头状生长模式。