PMC4900046_01
11-year-old male with interhemispheric lipoma. Axial postcontrast CT image shows left ethmoid opacities and a thin, rim-enhancing fluid collection along the lamina papyracea of the medial left orbit, consistent with a subperiosteal abscess (arrow).
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A contrast-enhanced CT of the sinuses and head revealed pansinus disease with a subperiosteal abscess along the medial left orbital wall (Fig. 1, arrow).
11-year-old male with interhemispheric lipoma. Axial postcontrast CT images obtained at a level superior to the lateral ventricles (A at standard brain window, and B at expanded windows at levels) show a fluid-density, bilobed simple cyst along the falx, without rim enhancement, and without obvious extension into the lateral ventricles. There is a lipoma associated with the cyst (B, arrow) that extends from the right atrium of the lateral ventricle (C, arrow), adjacent to the choroid, to superiorly along the falx.
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Adjacent to the falx, there was a bilobed, fluid-density structure that measured 4.7 cm x 4 cm in greatest transaxial dimensions (Fig. 2A), without any rim enhancement. Incidental note was made of a linear midline fat-density structure along the falx, adjacent to the cyst, with extension to the right trigonal choroid plexus (Figs. 2B-C, arrows).
11-year-old male with interhemispheric lipoma. Midline, sagittal, T1-weighted image (A) from an MRI obtained 10 years before demonstrates a normal-appearing corpus callosum and a high-signal intensity band, consistent with an intracranial lipoma. Axial T1-weighted image (B) above the level of the corpus callosum, at approximately the level of the CT images shown in Figs. 2A-B, shows no cyst.
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A remote comparison MR image that had been obtained for focal alopecia 10 years before demonstrated the interhemispheric lipoma (Fig. 3A, arrow), without any associated fluid collection (Fig. 3B, arrow). The remote MR image had also demonstrated a normal corpus callosum (Fig. 3A).