The most common leukemia in children is:

Smudge cells on peripheral smear suggest:

The most common extra-articular manifestation of rheumatoid arthritis is:

The most common organ involved in systemic sclerosis is:

Atrial septal defect (ostium secundum) is due to defect in:

Ventricular septal defect most commonly involves the:

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?