Table 1.

Demographic characteristics of the study population.

# Patients	62
# Patients with a history of pathology proven meningioma	87% (54/62)
Age	55.9 (21–89)
Sex	66% F (41/62)
Surgical history	85% (53/62)
Time from surgery to PET	Median: 8.0 months (19 days–14.6 yrs)
Radiation history	23% (14/62)
Time from radiation to PET	Median: 27.6 months (10 months–17.3 yrs)
N meningiomas	166
N post-treatment changes	41
N meningiomas per patient	15% (9/62) with 0 meningioma
	35% (22/62) with 1 meningioma
	34% (21/62) with 2–4 meningiomas
	16% (10/62) with > 4 meningiomas
	Median: 1.5 meningiomas per scan (0–16)
N post-treatment change lesions per patient	53% (33/62) with 0 post-tx change
	32% (20/62) with 1 post-tx change
	15% (9/62) with 2–4 post-tx changes
	Median: 0 post-tx change per scan (0–4)
WHO grade	31% (19/62) WHO grade 1
	47% (29/62) WHO grade 2
	10% (6/62) WHO grade 3
	13% (8/62) WHO grade not available