TABLE 2.
Magnetic resonance imaging measurements*
| Family No. | Individual No. | Sex | Age (yrs) at MRI | Diagnosis | Prepontine Space (mm)† | Obex (mm)‡ | AP Width of 4th Ventricle (mm) | Tentorial Angle (°) | AP Width of FM (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 9320 | 0001 | M | 46 | CM-0 | 9 | 0 | 10 | 95 | 30 |
| 9320 | 0100 | M | unknown | CM-I/S | unknown | unknown | unknown | unknown | unknown |
|
| |||||||||
| 9448 | 0001 | F | 12 | CM-I/S | 2 | 1 | 10 | 85 | 40 |
| 9448 | 1001 | F | 40 | CM-0 | 1.5 | 0 | 10 | 80 | 39 |
|
| |||||||||
| 9453 | 0001 | F | 33 | CM-0 | 2 | 5 | 10 | 65 | 40 |
| 9453 | 1001 | F | 62 | CM-I/S | 1 | −7 | 12 | 77 | 31 |
| 9453 | 1002 | F | unknown | CM-I/S | unknown | unknown | unknown | unknown | unknown |
| 9453 | 2002 | F | unknown | CM-I/S | unknown | unknown | unknown | unknown | unknown |
|
| |||||||||
| 9495 | 0001 | M | unknown | CM-I/S | unknown | unknown | unknown | unknown | unknown |
| 9495 | 0100 | M | 20 | CM-0 | 5 | 4 | 10 | 84 | 35 |
|
| |||||||||
| 9509 | 0001 | M | 12 | CM-I/S | 2 | 2 | 10 | 75 | 32 |
| 9509 | 0100 | M | 13 | CM-0 | 1 | 0 | 9 | 72 | 35 |
*
FM = foramen magnum.
†
Prepontine space at sphenooccipital synchondrosis.
‡
Tip of obex to a midpoint on the basion-opisthion line.