Spectra of intracranial diseases in Chinese military pilots (cadets) unqualified for transfer to pilot modified high performance aircraft

Table 1 Fighter type and age distribution of 36 pilots (cadets) with abnormal head magnetic resonance imaging results

Fighter type (battle station)		n	Proportion	Age (years)	Median age (years)	Flying time (hours)
Pilot cadet	Primary trainer cadet	16	44.4	20-23	21.4 ± 1.0	17-200
	Advanced trainer cadet	8	22.2	24-25	24.5 ± 0.5	300-370
	Pilot cadet in basic education stage	6	16.7	19-22	20.3 ± 1.0	0
Fighter pilot		6	16.7	29-34	31.1 ± 1.7	1200-1600

Table 2 Distribution of diseases and appraisal conclusions in 36 pilots (cadets) with abnormal head magnetic resonance imaging results, n (%)

Disease	n	Proportion	Detection rate	Fighter pilot	Advanced trainer cadet	Primary trainer cadet	Pilot cadet in basic education stage	Qualified for transfer to pilot modified high performance aircraft	Unqualified for transfer to pilot modified high performance aircraft	Qualified for flying	Transfer to pilot fighter	Transfer to pilot transport plane	Transfer to pilot helicopter	Transfer to air combat service division
Arachnoid cyst	17	47.2	3.1	1	4	9	3	7	10 (58.8)	4	7	6	0	0
Cerebral conus arteriosus	6	16.7	1.1	2	1	3	0	6	0 (0)	0	6	0	0	0
Cerebral aneurysm	5	13.9	0.9	2	2	1	0	0	5 (100)	0	2 (two-seat)	2	1
Cavernous hemangioma	4	11.1	0.7	0	2	1	1	0	4 (100)	3	0	0	0	1
Pituitary tumor	3	8.3	0.5	1	1	0	1	1	2 (66.7)	1	1	0	0	1
Vascular malformation	2	5.6	0.4	0	0	2	0	0	2 (100)	0	0	0	2	2