Prevalence of MRI findings in children with achondroplasia
| MRI Finding | Prevalence |
|---|---|
| Deep transverse temporal sulcus (axial T1WI) | 13/13 (100%) |
| Sagittal clefting in the medial temporal lobe (sagittal T2WI) | 13/13 (100%) |
| Incomplete hippocampal inversion | 12/13 (92%) |
| Ventriculomegaly | 12/13 (92%) |
| Oversulcation of the mesial temporal lobe | 11/13 (85%) |
| Extension of oversulcation to the calcar avis | 9/13 (69%) |
| Loss of gray-white matter differentiation of the mesial temporal lobe | 5/7a (71%) |
| Abnormal triangular shape of the temporal horn | 6/13 (46%) |
| Megalencephaly | 5/13 (38%) |
| Temporal lobe enlargement | 1/13 (8%) |
↵a In the 6 children younger than 36 months of age, loss of gray-white matter differentiation of the mesial temporal lobe could not be accurately assessed on available sequences due to the incomplete myelination.