A 72-year-old woman falls and sustains a hip fracture. X-ray shows a fracture at the femoral neck. Which artery is most at risk of injury leading to avascular necrosis?

A 3-year-old boy presents with a painless swelling of the scrotum that increases during crying and decreases when lying down. Transillumination is positive. What is the most likely diagnosis?

A caregiver consistently fails to provide food, shelter, and supervision. This is best described as:

A child with untreated asthma and missed clinic visits is an example of:

The gold standard for diagnosing posterior urethral valves is: