Table 3.

MRI involvement for affected (SWS) subjects from both cohorts. MRIs reported are those performed closest in time to the qEEG recording. MRIs are graded per Jansen (2002), as modified in Hatfield (2007). Scores for each hemisphere range from 4-16 and reflect the sum of the scores in each of the four lobes. Lobar scoring ranges from 1 (no involvement) to 4 (severe involvement: angiomatosis + severe atrophy). Scores are reportedly for the hemisphere ipsilateral to the maximal extent of the PW birthmark and contralateral to the maximal PW birthmark

Subject	Age at MRI	Bilateral MRI Involvement?	MRI Involvement (ipsilateral)	MRI Involvement (contralateral)
I-5	9 mos.	No	7	4
I-6	Birth	No	4	4
I-6	7 mos.	No	10	4
I-7	1 mo.	No	10	4
I-7	8 mos	No	11	4
I-8	Birth	No	11	4
V-5	4 mos.	No	8	4
V-5	21 mos.	No	10	4
V-6	3 mos.	Yes	15	7
V-7	8 mos.	No	8	4
V-8	4 mos.	Yes	13	7
V-9	Birth	No	7	4
V-9	5 mos.	Yes	15	13