Q. A 32-year-old woman comes to the physician’s office for a painful wrist on the right side for the past 4 months. The pain increases with activities and relieves by taking rest. She denies trauma. Her medical history shows that she delivered a baby boy 14 months ago without any complications. Her menstrual history is regular and she is not on any medication. Her temperature is 98.4°F (36.9°C), pulse is 88 beats per minute, BP is 120/80 mm of Hg and respiratory rate is 14/min. A physical examination of the right wrist shows a small swelling over the radial styloid which is hard, tender, and movable. The patient complains of sharp pain over the radial styloid when asked to perform ulnar deviation of the wrist and flexion of the thumb across the palm. The rest of the examination is unremarkable. What is the most likely diagnosis for this patient based on her clinical features?