Magnetic Resonance Imaging and Computed Tomography in Patients With Stage I Seminoma of the Testicle

DISEASE CHARACTERISTICS: * Histologically confirmed seminoma of the testis * Stage I disease, as determined by clinical examination and CT scan of the chest, abdomen, and pelvis * No evidence of any non-seminoma germ cell tumor elements * Has undergone orchidectomy within the past 8 weeks * Normal serum alpha-fetoprotein pre-orchidectomy and at study randomization * Normal serum beta human chorionic gonadotrophin at study randomization (may have been elevated pre-orchidectomy) * Not planning to undergo adjuvant therapy PATIENT CHARACTERISTICS: * Able to attend regular surveillance * No other malignancy within the past 10 years expect successfully treated nonmelanoma skin cancer * No contraindication to MRI (i.e., ferrous metal implants of any type, cardiac pacemaker or defibrillator, or history of injury by metal fragments) PRIOR CONCURRENT THERAPY: * See Disease Characteristics