Image findings and pathological findings of lymphoepithelial cysts with hyper internal echo-a comparison with dermoid cysts.

IF 1.6 3区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Oral Radiology Pub Date : 2025-03-15 DOI:10.1007/s11282-025-00818-1

Misa Yasaka, Kazutoshi Okamura, Mayumi Shimizu, Koji Sagiyama, Tamotsu Kiyoshima, Shintaro Kawano, Masafumi Moriyama, Toru Chikui

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引用次数: 0

Abstract

Objective: To summarize the ultrasonography (US) and magnetic resonance imaging (MRI) findings of lymphoepithelial cysts (LECs) and dermoid cysts (DCs) and to discuss the hyperinternal echo in LECs based on histopathological findings.

Methods: Patients who underwent US and MRI before resection and whose lesions were pathologically diagnosed as LECs or DCs were included (January 2010 to December 2023). Internal echo, convective flow, and Doppler signals were evaluated on US, while on MRI, we measured the apparent diffusion coefficient (ADC).

Results: Surprisingly, all lesions (4 LECs and 7 DCs) had hyperinternal echoes. Convective flow and Doppler signals were observed in 2 of the 4 cases of LEC, and the ADC was high in these cases (2.4 × 10^-3 and 2.0 × 10^-3 mm²/s). In the two cases where they were not, the ADC was low (1.4 × 10^-3 and 0.81 × 10^-3 mm²/s). Various cells, such as lymphocyte cells, foam cells, erythroid cells, and keratin, have been found in the cystic cavity, which are thought to be the cause of hyperecho. Considering the ADC, the presence or absence of convection and Doppler signals is thought to reflect the ease of movement of the contents. In the DCs, neither internal convection nor obvious Doppler signals were observed. ADCs were quite low for cysts, which was a characteristic finding (1.1 ± 0.13^-3 mm²/s).

Conclusion: It is well known that DCs appear hyperechoic on US owing to the presence of keratin; however, it is necessary to recognize that some LECs are depicted as hyperechoic masses and have convective flow and Doppler signals depending on the content.

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淋巴上皮囊肿内回声高的影像及病理表现与皮样囊肿的比较。

目的：总结淋巴上皮囊肿（LECs）和皮样囊肿（DCs）的超声（US）和磁共振（MRI）表现，并结合组织病理学表现探讨上皮囊肿的高内回声。方法：纳入2010年1月至2023年12月切除术前行US和MRI检查，病理诊断为lec或DCs的患者。内部回声、对流流和多普勒信号在超声上被评估，而在MRI上，我们测量了表观扩散系数（ADC）。结果：令人惊讶的是，所有病变（4例lec和7例DCs）均有高内回声。4例LEC中有2例出现对流流和多普勒信号，ADC较高（2.4 × 10-3和2.0 × 10-3 mm2/s）。在两种情况下，ADC很低（1.4 × 10-3和0.81 × 10-3 mm2/s）。囊腔内发现多种细胞，如淋巴细胞、泡沫细胞、红细胞和角蛋白，被认为是引起超回声的原因。考虑到ADC，对流和多普勒信号的存在与否被认为反映了内容物移动的容易程度。在DCs中，没有观测到内部对流，也没有观测到明显的多普勒信号。囊肿adc相当低，这是一个特征性发现（1.1±0.13-3 mm2/s）。结论：众所周知，由于角蛋白的存在，dc在US上出现高回声；然而，有必要认识到一些lec被描述为高回声团块，并根据内容具有对流流和多普勒信号。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oral Radiology DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

4.20

自引率

13.60%

发文量

审稿时长

>12 weeks

期刊介绍： As the official English-language journal of the Japanese Society for Oral and Maxillofacial Radiology and the Asian Academy of Oral and Maxillofacial Radiology, Oral Radiology is intended to be a forum for international collaboration in head and neck diagnostic imaging and all related fields. Oral Radiology features cutting-edge research papers, review articles, case reports, and technical notes from both the clinical and experimental fields. As membership in the Society is not a prerequisite, contributions are welcome from researchers and clinicians worldwide.