LAUSR

A 64‐year‐old man experienced sudden dizziness for 20 days. He was admitted to Xuanwu Hospital, Capital Medical University, Beijing, China, with the diagnosis of a cerebral tumor. On admission, his hematological tests and physiological functions were in the normal range. A computed tomography (CT) scan revealed a large mass lesion in the left frontal and parietal lobe near the lateral ventricles. Slight calcification was observed in the lesion. Magnetic resonance imaging revealed a cystic tumor with a mural nodule. Perilesional edema was absent, and no mass effect or mid‐line shift was noted. The mural nodule exhibited low‐signal intensity on T1‐weighted images [WI, Figure 1a] and high‐signal intensity on T2‐WI [Figure 1b] and fluid‐attenuated inversion recovery images. The tumor was enhanced with gadolinium, but the cyst wall was not. The patient subsequently underwent surgery with clinical suspicion of choroid plexus papilloma or astrocytoma. During surgery, a cyst containing clear, yellowish fluid and a mural nodule protruding into the cyst were detected. Postoperative CT imaging confirmed radical removal. No radiotherapy was offered to the patient, and no signs of recurrence were noted at the 4‐year follow‐up.