Fig. 2From: Predictors of cervical myelopathy and hydrocephalus in young children with achondroplasia‘FM AP’ (A) was measured using T2 sagittal MRI images. The T1 sagittal MRI image was used to measure ‘Cord thickness narrowest’ (B) and ‘Cord thickness C2’ (C). We created a new parameter called ‘Cord constriction ratio’ and calculated it as ‘1—(B/C)’Back to article page