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TABLE 2: Classification of Neuroradiologic Abnormalities
Classification and Abnormality Number
No referral required 
 Chronic sinusitis 21
 Arachnoid cyst 2
 Frontal venous angioma 2
 Mega cisterna magna 2
 Ventricular asymmetry 1
 Chronic sinusitis with pineal cyst 1
Routine referral required 6
 Acute sinusitis 5
 Focal white matter lesion of uncertain etiology 3
 Tonsillar ectopia 1
 Hypoplasia pons 1
 Petrous apex lesion 1
 Acute sinusitis with arachnoid cyst 
Urgent referral required, cerebellar tonsil lesion uncertain etiology 1
Note.—Abnormalities were detected on 225 conventional research brain MR images in a cohort of neurologically healthy children.

Classification and Abnormality	Number
No referral required
Chronic sinusitis	21
Arachnoid cyst	2
Frontal venous angioma	2
Mega cisterna magna	2
Ventricular asymmetry	1
Chronic sinusitis with pineal cyst	1
Routine referral required	6
Acute sinusitis	5
Focal white matter lesion of uncertain etiology	3
Tonsillar ectopia	1
Hypoplasia pons	1
Petrous apex lesion	1
Acute sinusitis with arachnoid cyst
Urgent referral required, cerebellar tonsil lesion uncertain etiology	1