Background

Colloid cysts of the third ventricle are benign congenital lesions. They are at times totally asymptomatic or may be detected in the evaluation for headache, neurologic disturbances, or psychiatric disturbances. They may sometimes cause grave consequences such as coma or even sudden death. The radiologic appearance is unique and important for making decisions in the management.

Case Description

We report a patient with a colloid cyst who presented to us after sudden deterioration in consciouness. It was noted that he underwent brain computed tomography (CT) scan 10 months ago in the evaluation of headache. Compared with previous CT scan, there was a sudden change in the density and size of the colloid cyst with obstructive hydrocephalus. This unique change in the character of the colloid cyst occurred without any intervention. We discuss the possible etiologies behind this phenomenon along with a review of the literature.

Conclusions

This case stands out remarkably because it is only the second case in literature with similar natural history.

中文翻译：

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胶体囊肿密度的自发变化：一种不寻常的现象。

背景

第三脑室的胶体囊肿是先天性良性病变。它们有时完全没有症状，或者可能在评估头痛，神经系统疾病或精神疾病时被发现。它们有时可能导致严重后果，例如昏迷甚至猝死。放射学外观是唯一的，对于管理决策至关重要。

案例描述

我们报告了一个意识状态突然恶化后出现的胶体囊肿患者。据指出，他在10个月前接受了脑部计算机断层扫描（CT）扫描以评估头痛。与先前的CT扫描相比，阻塞性脑积水的胶体囊肿的密度和大小突然改变。胶体囊肿特征的这种独特变化无需任何干预即可发生。我们讨论了这种现象背后的可能病因，并回顾了文献。

结论

这种情况之所以能脱颖而出，是因为它只是自然历史相似的文学中的第二种情况。