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Click 28 year old female with subependymoma. Plain CT scan showing subtle abnormality in the region of the septum pellucidum which is not normally visualized, with mild bilateral lateral ventricular hydrocephalus. The neoplasm has a homogenously low attenuation value on CT approaching that of CSF giving such appearance. No evidence of calcifications was noted. Spiral CT scan, axial, 5 mm slice, KVP 1.4, exposure 300.

Click 28 year old female with subependymoma, MRI Axial T1 precontrast study showing subtle homogenously hypointense lesion in the region of the septum pellucidum (arrows), measuring 3x2.5x1.5 cm with mild bilateral lateral ventricular hydrocephalus. MRI: 3 Tesla magnet, T1 weighted image (TE = 8.4, TR = 400), axial, 5 mm slice.

Click 28 year old female with subependymoma, MRI Axial T1 postcontrast study showing subtle homogenously hypointense lesion in the region of the septum pellucidum (arrow), measuring 3x2.5x1.5 cm in size, with mild bilateral lateral ventricular hydrocephalus. No significant contrast enhancement is seen. MRI: 3 Tesla magnet, T1 weighted image (TE = 8.4, TR = 400), axial, 5 mm slice. Contrast study 10 ml Gadolinium (Dotarem).

Click 28 year old female with subependymoma, MRI Axial T2-weighted study appears unremarkable. A subtle hyperintense lesion is seen, which may be confused with a cavum septum pellucidum, with mild bilateral lateral ventricular hydrocephalus. MRI: 3 Tesla magnet, T2 weighted image (TE = 99, TR = 3000), axial, 5 mm slice.

Click 28 year old female with subependymoma, MRI coronal FLAIR sequence shows subtle mass involving the septum pellucidum which shows slightly different signal intensity from that of the CSF. It is measuring 3x2.5x1.5 cm in size. There is linear extension of the mass along the medial left ventricular wall and roof with about 0.8-1.2 cm thickness. MRI: 3 Tesla magnet, T2 coronal FLAIR image (TE = 94, TR = 9000), coronal, 5 mm slice.

Click 28 year old female with subependymoma, plain MRI sagittal T1weighted sequence shows irregularity in the roof of the left lateral ventricle. MRI 3 Tesla magnet, T1 weighted image (TE = 2.5, TR = 1900), sagittal, 1 mm slice.

Click 28 year old female with subependymoma, MRI Diffusion weighted sequence (DWI) shows no hyperintense signal to suggest a diffusion restriction in the septum pellucidum mass. MRI: 3 Tesla magnet, DWI (TE = 110, TR = 12000, b=1000), axial, 5mm slice.

Click 28 year old female with subependymoma, MRI diffusion weighted sequence; ADC map shows no abnormal hypointense signal to suggest a diffusion restriction in this septum pellucidum mass. MRI: 3 Tesla magnet, DWI (TE = 110, TR = 12000, b=1000), ADC map, axial, 5mm slice.

Click 28 year old female with subependymoma, follow up plain CT scan 1 and half year postoperatively, shows no evidence of recurrence of the septum pellucidum tumor. Multislice 64 CT scanner, 2.5 mm reconstructed axial sections. Kvp 120, exposure 63.

Click 28 year old female with subependymoma, follow up MRI, precontrast axial T1 weighted study shows no abnormality in the site of the removed intraventricular mass. Postoperative changes are seen in the right cerebral hemisphere. 3Tesla MR, T1 weighted image (TE = 8.4, TR = 500), 5 mm.

Click 28 year old female with subependymoma, follow up MRI, axial T2 weighted study demonstrates no abnormality in the site of the removed intraventricular mass. Postoperative changes are seen in the right cerebral hemisphere. T2 W (TE=99, TR=3000)

Click 28 year old female with subependymoma, follow up MRI, coronal FLAIR sequence. Images demonstrate no recurrence of the removed intraventricular mass. 3Tesla MR. Coronal FLAIR (TE=94, TR=7000), 5 mm.

Click 28 year old female with subependymoma, follow up MRI, contrast enhanced T1 weighted sagittal study. Images demonstrate no abnormality in the region of the removed intraventricular mass. 3Tesla MR, T1 weighted image (TE = 8.4, TR = 500), 5 mm. Gadolinium (Dotarem), 10 ml.