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TABLE 3: Distribution of Abnormalities by Subject Age at MR Imaging Examination
Classification and Abnormality No. of Subjects by Age (y) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 No referral required Chronic sinusitis 0 1 0 0 0 0 1 3 3 2 4 1 4 2 0 0 0 0 Arachnoid cyst 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 Frontal venous angioma 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 Mega cisterna magna 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 Ventricular asymmetry 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Chronic sinusitis with pineal cyst 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 Routine referral required Acute sinusitis 0 0 0 0 0 0 1 2 0 0 1 0 0 1 1 0 0 0 Focal white matter lesion of uncertain etiology 0 0 0 0 0 0 0 0 0 1 0 0 0 0 2 1 1 0 Tonsillar ectopia 0 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 Hypoplasia pons 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Petrous apex lesion 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 Acute sinusitis with arachnoid cyst 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 Urgent referral required, cerebellar tonsil lesion uncertain etiology 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0