Toddler with a sacral dimple

MRI of lipoma of the filum terminale and tethered cord
Sagittal T1 MRI without contrast of the lumbar spine (left) shows hyperintense signal in the conus medullaris which lies low in position at the level of L2-L3. Axial T1 MRI through the conus (right) better shows the hyperintense signal in the conus which is the same signal intensity as the subcutaneous fat.

The diagnosis was lipoma of the filum terminale and tethered cord.