A 68-year-old man on hemodialysis via a left arm arteriovenous fistula presents with left-hand weakness and numbness. 

A 72-year-old woman with silicone breast implants undergoing screening mammography.

A 29-year-old man with acute-onset, left-sided testicular pain.

A 39-year-old woman with right upper quadrant pain, bloating, and nausea.

A 1-month-old premature neonate born at 27 weeks gestation having difficulty weaning off ventilator. 

A 30-year-old woman with abdominal pain.

A 49-year-old woman with an enlarging, palpable mass on her back.

A 28-year-old pregnant woman with left-sided pelvic pain and light vaginal bleeding.

A 28-year-old woman with neck tenderness and discomfort for the past week.

A 1-month-old female infant with failure to thrive and vomiting.

A 25-year-old woman with dyspareunia and vaginal spotting after intercourse.

A 26-year-old pregnant woman with suprapubic pain.

A fetus at 23 weeks of gestation undergoing anatomic imaging.

A 39-year-old man with sudden-onset low back pain radiating down both legs.

A 4-year-old girl with hardness and swelling on the right side of her abdomen.

A premature, female newborn undergoing brain imaging.

A 7-year-old boy with "fullness" under his chin for years.

An 87-year-old woman with chronic low back pain.

A 21-year-old man with a red scrotum and a swollen and hard testicle.

A 27-year-old woman with a twin pregnancy at 23 weeks of gestation with an abnormal second-trimester ultrasound scan.