PMC6159129_01
MRI of the pelvis reveals sacral lesion. Axial (a) and coronal (b) T1 weighted images of the pelvis (scan parameters: TR= 540 ms; TE= 10 ms; 640 x 640; 4-mm slice thickness) demonstrate a slightly hypointense well-demarcated rounded lesion involving the right sacrum at S2 between the anterior neural foramina of S1 and S2. This lesion was hyperintense on axial (c) and coronal (d) short tau inversion recovery (scan parameters: TR = 5400 ms; TE = 60 ms; 512 x 512; 4-mm slice thickness). Coronal pre-contrast (e) and post-contrast T1 weighted (scan parameters: TR = 700 ms; TE=10 ms; 640 x 640; 4-mm slice thickness) images (f) demonstrate homogeneous enhancement within the right sacral lesion. TE, echo time; TR, repetition time.
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f1
The sacral lesion was hypointense on T1 weighted images, hyperintense on T2 weighted and short tau inversion-recovery images (Figure 1) and enhanced homogeneously on contrast-enhanced images (Figure 1).
Sacral lesion is occult on CT scan. A representative axial CT image (120 kVp, 90 mA, slice thickness 3 mm) of the expected location of the intraosseous hibernoma does not demonstrate an appreciable abnormality.
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CT images (Figure 2) did not demonstrate any obvious sacral lesion.