Developmental venous anomalies (DVAs) are frequent cerebral vascular malformations mostly considered as asymptomatic [1, 2]. We present a rare case of DVA thrombosis which raised a suspicion of a cortical brain tumor. A healthy 24-year-old male presented with acute headache, dysarthria, and left-sided weakness of the upper limb and tongue followed by focal seizures within the left cheek. Unenhanced CT and MRI showed a right frontal cortical/subcortical expansile lesion. Detailed analysis of several MR sequences enabled a correct diagnosis of a thrombosed DVA with venous edema (Fig. 1, 2), which mostly resolved after 2 months of treatment. Accurate radiological diagnosis is crucial to avoid unnecessary surgery.

中文翻译：

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发育性静脉异常血栓形成：模拟皮质脑肿瘤

发育性静脉异常 (DVA) 是常见的脑血管畸形，通常被认为是无症状的 [1, 2]。我们提出了一个罕见的 DVA 血栓形成病例，它引起了对皮质脑肿瘤的怀疑。一名健康的 24 岁男性出现急性头痛、构音障碍、上肢和舌头左侧无力，随后左脸颊局灶性癫痫发作。平扫 CT 和 MRI 显示右侧额叶皮质/皮质下扩张性病变。对几个 MR 序列的详细分析能够正确诊断血栓形成的 DVA 并伴有静脉水肿（图 1、2），大部分在治疗 2 个月后消退。准确的放射学诊断对于避免不必要的手术至关重要。