Table 1:

Imaging and clinical findings in 12 patients with large arachnoid granulations within the dorsal SSS

Age	Sex	FS	MRV	Size, cm	Distance Above Torcular, cm	T1WI	T2WI	FLAIR	DWI	Location Relative to λ	Stenosis, %	Septation	Clinical
64	F	3T		1.2 × 0.7 × 1.1	5.1	Mixed	Hyper	Iso	Hypo	λ	20	Yes	MS follow-up, right leg weakness, initially called meningioma
42	F	3T		0.6 × 0.7 × 0.8	5.1	Mixed	Hyper	Iso	Hypo	λ	60	Yes	Right temporal headaches
42	F	3T-MRV	T, C	1.1 × 1.1 × 1.8	3.9	Mixed	Hyper	Iso	Hypo	−2 mm	86	Yes	Headache, initially called thrombosis, 0.7T-MR imaging
35	F	1.5T		1.1 × 1.8 × 1.9	5.8	Hypo	Hyper	Iso	Hypo	λ	60	Yes	Left temporal headache
42	M	1.5T		0.2 × 0.3 × 0.4	5.9	Hypo	Hyper	Iso	Hypo	λ	50	No	Headache
28	M	3T	T, C	0.8 × 0.9 × 1.1	5.2	Mixed	Hyper	Iso	Hypo	λ	50	No	Seizures right frontal glioma
52	M	3T		0.7 × 1.1 × 1.7	3.0	Hypo	Hyper	Iso	Hypo	−2 mm	86	Yes	Headaches
57	M	1.5T	T	0.4 × 0.6 × 0.6	6.2	Hypo	Hyper	Hypo	Hypo	+12 mm	50	No	Ischemic stroke
45	F	1.5T		0.4 × 0.6 × 0.6	3.5	Hypo	Hyper	Hypo	Hypo	λ	40	No	Headache, Chiari I, initially called thrombosis
18	F	3 T		1.1 × 1.6 × 1.1	2.6	Hypo	Hyper	NA	NA	−3 mm	74	No	Headache, blurry vision
2	M	1.5T		0.8 × 0.9 × 1.0	5.8	Hypo	Hyper	NA	Hypo	λ	58	No	Developmental delay, initially called dermoid
17	F	1.5T	T	1.3 × 1.0 × 1.0	2.8	Hypo	Hyper	Hypo	Hypo	λ	52	Yes	Occipital headaches

Note:—Hypo indicates hypointense relative to brain; Iso, isointense relative to brain; Hyper, hyperintense relative to brain; Mixed, areas of hypointensity and isointensity on T1WI; FS, magnetic field strength; Distance Above Torcular, linear distance above torcular; T, time-of-flight; C, elliptic centric encoded, contrast-enhanced MRV; SSS, superior sagittal sinus; M, male; F, female; NA, not applicable; MS, multiple sclerosis. Patient 10 did not have fluid-attenuated inversion recovery or diffusion-weighted MR imaging, and patient 11 did not have fluid-attenuated inversion recovery.