Elsevier

World Neurosurgery

Volume 108, December 2017, Pages 985.e9-985.e11
World Neurosurgery

Clinical Images
Joint Capsule–Like Intracranial Osteochondroma Mimicking Cystic Meningioma

https://doi.org/10.1016/j.wneu.2017.08.163Get rights and content

This report provides the first representative images of an intracranial osteochondroma with a cystic component mimicking cystic meningioma. A 40-year-old male presented at our outpatient clinic with decreased sensation in his right upper extremity. Preoperative computed tomography showed a tumor with a cystic meningioma–like appearance and prominent calcifications. On magnetic resonance imaging, calcification of the lesion was suggested by the T2-weighted image; weak enhancement was seen on the T1-weighted image. Following surgical removal of the tumor, the pathologic examination showed findings consistent with osteochondroma. Cystic meningioma is a rare tumor with a cystic component. Intracranial osteochondroma is also a rare, benign tumor that can mimic meningioma when presenting in the dural convexity. Our report describes the joint capsule–like appearance of a convex cystic osteochondroma including a calcified cap, bonelike structure, and fluid-containing intracapsular space. The tumor was evaluated by imaging and pathologic studies.

Section snippets

Clinical Image

A 40-year-old male presented to our department with decreased sensation in his right upper extremity that started a few days before presentation. Noncontrast computed tomography showed a left frontal calcific lesion with a cystic component and mass protruding into the cyst (Figure 1, left). On magnetic resonance imaging (MRI), the T2-weighted image also indicated calcification, with a hypointensity in the tumor cap and a protruding lesion (Figure 1, center). The gadolinium-enhanced, T1-weighted

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Conflict of interest statement: The authors declare that the article's content was composed in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Yusuke S. Hori and Yuki Ebisudani contributed equally to this work.

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