TABLE 4.

Frequency of Self-Reported MRI or CT Scan Within the Past 5 Years in 1-Year Retinoblastoma Survivors by Hereditary Status

MRI or CT scan	Hereditary no. (%)	Nonhereditary no. (%)	Chi-square P
No. of MRI or CT scans
None	271 (61.5)	300 (76.0)
1	80 (18.1)	55 (13.9)
2–4	61 (13.8)	30 (7.6)
≥5	29 (6.6)	10 (2.5)	<.001
Reason scan was performed
Trauma*	22 (12.9)	27 (28.4)
Surveillance†	45 (26.5)	8 (8.4)
Staging‡	11 (6.5)	2 (2.1)
Evaluation of new symptoms§	66 (38.8)	43 (45.3)
Other	26 (15.3)	15 (15.8)	<.001

MRI indicates magnetic resonance imaging; CT, computed tomography.

^*Orthopedic injuries.

^†Screening of asymptomatic second cancer after retinoblastoma.

^‡Staging of cancer.

^§Evaluation of headaches, migraines, kidney stones, etc.