TABLE 4.

Detection rate of each incidental finding.

	Incidental findings
No referral necessary	N = 577 (99.7%)
	White matter hyperintensities	566(97.75%)
	Brain atrophy	523(90.33%)
	Enlarged perivascular space	490(84.63%)
	Cerebral microbleeds	226(39.03%)
	Paranasal sinusitis	196(33.85%)
	Retention cysts of the maxillary sinus	33(5.70%)
	Calvarial thickening	1(0.17%)
	Mastoiditis	13(2.25%)
Routine referral	N = 169 (29.2%)
	Pineal cyst	4(0.69%)
	Asymptomatic brain infarct	44(7.60%)
	Falx cerebri ossification	10(1.73%)
	Empty sella	55(9.50%)
	Rathke’s cleft cyst	52(8.98%)
	Hydrocephalus	1(0.17%)
	Cysts of the septum pellucidum	7(1.21%)
	Subdermal cyst	6(1.04%)
	Enlarged cisterna magna	11(1.90%)
Urgent referral	N = 50 (8.6%)
	Venous malformation	14(2.42%)
	Cavernous malformation	11(1.90%)
	Meningioma	3(0.52%)
	Osteoma	2(0.35%)
	Arachnoid cyst	8(1.38%)
	Bone cyst	2(0.35%)
	Craniopharyngiomas	1(0.17%)
	Pituitary adenoma	11(1.90%)
	Metastasis	1(0.17%)
	Chronic subdural hematoma	2(0.35%)

In many cases, there was more than one finding in a person. All diagnoses were based on imaging observations.