A 23-year-old male reports that during a game of hoops (basketball), he tripped while driving the ball to the basket, and fell on his outstretched right hand with the palm down. Two days later, he phoned his anatomist father and related that his right wrist was painful. Later that day, he visited his father, who noted that the wrist was slightly swollen and tender but without deformity. He instructed his son to extend the right thumb, thereby accentuating the anatomical "snuffbox," which is extremely tender to deep palpation. His father advised him to get his hand and wrist x-rayed. 1. What is the most likely diagnosis?
2. What is the most likely anatomic defect?