The pericallosal lipoma mimicking deep cerebral vein thrombus.

To cite: Ogul H, Pirimoglu B, Ozbek S, et al. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/ bcr-2013-010025 DESCRIPTION A 44-year-old woman with headache was referred to our institution for further investigation. An MRI of the brain showed that linear hyperintense radiological appearances at the trace of the inferior sagittal sinus and the vein of Galen on T1-weighted and T2-weighted MRI (figure 1A,B). The MRI prompted suspicion that there was an inferior sagittal sinus thrombosis. Then, the patient subsequently underwent a contrast-enhanced CT venography to make an accurate diagnosis of an inferior sagittal sinus thrombus. The CT venography showed a low-density lesion (mean-84 HU) at the pericallosal space (figure 2A,B). Concordantly, pericallosal curvilinear-type lipoma was confirmed on the CT image. The majority of intracranial lipomas occur at or near the midline. Pericallosal lipomas can be divided into two subgroups as the tubulonodular and curvilinear type. The diagnosis of the pericallosal lipoma is easily performed with a CT and fatsuppressed MRI. The differential diagnosis of a pericallosal lipoma includes pericallosal haemorrhage or rare tumoural lesions. Differential diagnosis list of pericallosal lipoma must also include vascular pathologies (such as an aneurysm and venous thrombosis).