TABLE 4.
Statistical analyses of clinical and imaging findings
| Relationship between MRI findings | Intratumoral T1WI high‐intensity area | p‐value |
|---|---|---|
| Stalk‐like sign | ||
| Positive (n = 10) | 9/10 (90.0%) | .0031* (Fisher's exact test) |
| Negative (n = 40) | 14/40 (35.0%) | |
| Atrophy of the surrounding brain parenchyma of the tumor | ||
| Positive (n = 14) | 13/14 (92.9%) | .0001* (Fisher's exact test) |
| Negative (n = 36) | 10/36 (27.8%) | |
| Tumor location (n = 50) | Age at diagnosis (median years [range]) | p‐value |
| Supratentorial angiocentric glioma (n = 43) | 13 [2‐83] | <.0001* (Mann‐Whitney U test) |
| Brainstem angiocentric glioma (n = 7) | 5 [2‐7] | |
| MRI findings in patients with seizure/epilepsy history (n = 29) | Seizure/epilepsy history length (median years [range])a | p‐value |
| Intratumoral T1WI high‐intensity area | ||
| Positive (n = 15) | 3 [<1‐35] | .0021* (Mann‐Whitney U‐test) |
| Negative (n = 14) | 0.25 [<1‐10] | |
| Stalk‐like sign | ||
| Positive (n = 8) | 13.5 [<1‐35] | <.0001* (Mann‐Whitney U‐test) |
| Negative (n = 21) | 1 [<1‐14] | |
| Atrophy of the surrounding brain parenchyma of the tumor | ||
| Positive (n = 9) | 14 [1‐35] | <.0001* (Mann‐Whitney U‐test) |
| Negative (n = 20) | 0.5 [<1‐10] | |
Abbreviations: n, number; T1WI, T1‐weighted image.
a
The length was calculated by subtracting the age of seizure/epilepsy onset from age at diagnosis. Length for the patients who presented with the first episode of seizure/epilepsy was calculated as zero (n = 6). Cases without mentioning the specific history length were excluded from the calculation (n = 7).
*Statistically significant.