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KMID : 0942820110100010003
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Journal of Korean Brain Tumor Society
2011 Volume.10 No. 1 p.3 ~ p.7
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MRI Findings of Incidental Pineal Cysts
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Jung Jong-Rak
Chang Hoe-Young
Lee Ghi-Jai
Kim Myoung-Soo
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Abstract
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Objective: We performed this study to determine the incidence and magnetic resonance imaging (MRI) characteristics of pineal cysts.
Materials and Methods: We analyzed 1,168 patients with MR imaging between January 1, 2009 and May 13, 2010. MR imaging signal, enhancement patterns, size of the pineal cyst and amount of deformity of the tectum were analyzed.
Result: Overall, 48 patients (4.1%) with pineal cyst were found in the 1168 patients evaluated. The most dominant signal of T2-weighted image, T1-weighted image, and fluid-attenuated inversion-recovery images of the pineal cyst were isointense compared with cerebrospinal fluid (CSF) in 46 patients (46/48), isointense compared with CSF in 30 patients (30/48), and hyperintensity compared with parenchyma in twenty one patients (21/48). Cyst enhancement pattern were slight cyst wall enhancement in twelve patients, and strong cyst wall enhancement in twenty four patients. Tectal deformity was observed as follow ; no contact between the cyst and the tectum in three patients, the cyst touching the tectum in twenty six, the cyst mildly deforming the tectum but not narrowing the aqueduct in nine, and the cyst moderately deforming the tectum but not narrowing the aqueduct in three patients. The diameter of the antero-posterior direction was 8.39±2.59 mm.
Conclusion: The frequency of pineal cyst evaluated with MR images was 4.1%. The MR signal and enhancement of pineal cyst were constant in most cases. But some cases showed different signal. This variability may make them indistinguishable from other pineal region tumors.
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KEYWORD
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Pineal gland, Cyst, Incidence, Magnetic resonance imaging
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