This wide range of numbers is probably partly due to differences among regions in whether and how injuries are reported. In North America, about 39 people per every million incur SCI traumatically each year, and in Western Europe, the incidence is 16 per million. In the United States, the incidence of spinal cord injury has been estimated to be about 40 cases per 1 million people per year or around 12,000 cases per year. In China, the incidence is approximately 60,000 per year. The estimated number of people living with SCI in the world ranges from 236 to 4187 per million. Estimates vary widely due to differences in how data are collected and what techniques are used to extrapolate the figures. Little information is available from Asia, and even less from Africa and South America. In  Western Europe the estimated prevalence is 300 per million people and in North America it is 853 per million. It is estimated at 440 per million in Iran, 526 per million in Iceland, and 681 per million in Australia. In the United States there are between 225,000 and 296,000 individuals living with spinal cord injuries, and different studies have estimated prevalences from 525 to 906 per million.SCI is present in about 2% of all cases of blunt force trauma. Anyone who has undergone force sufficient to cause a thoracic spinal injury is at high risk for other injuries also.
Thyroid and parathyroid
Incidental thyroid masses may be found in 9% of patients undergoing bilateral carotid duplex ultrasonography.Some experts recommend that nodules > 1 cm (unless the TSH is suppressed) or those with ultrasonographic features of malignancy should be biopsied by fine needle aspiration. Computed tomography  is inferior to ultrasound for evaluating thyroid nodules. Ultrasonographic markers of malignancy are:
solid hypoechoic appearance
irregular or blurred margins
intranodular vascular spots or pattern
microcalcificationsIncidental parathyroid masses may be found in 0.1% of patients undergoing bilateral carotid duplex ultrasonography.The American College of Radiology recommends the following workup for thyroid nodules as incidental imaging findings on CT, MRI or PET-CT:

Pulmonary
Studies of whole body screening computed tomography find abnormalities in the lungs of 14% of patients. Clinical practice guidelines by the American College of Chest Physicians advise on the evaluation of the solitary pulmonary nodule. Kidney
Most renal cell carcinomas are now found incidentally. Tumors less than 3 cm in diameter less frequently have aggressive histology.A CT scan is the first choice modality for workup of solid masses in the kidneys. Nevertheless, hemorrhagic cysts can resemble renal cell carcinomas on CT, but they are easily distinguished with Doppler ultrasonography (Doppler US). In renal cell carcinomas, Doppler US often shows vessels with high velocities caused by neovascularization and arteriovenous shunting. Some renal cell carcinomas are hypovascular and not distinguishable with Doppler US.