First symptoms in retinoblastoma.
D000367:Age Factors; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005134:Eye Neoplasms / Q000175:diagnosis* / Q000601:surgery; D006801:Humans; D007223:Infant; D012175:Retinoblastoma / Q000175:diagnosis* / Q000601:surgery