My neighbor was babysitting my then 11 month old for the day. Her dad was my last patient of the day. Coming in for “sternal pain.” Initially suspected costochondritis as he told me he does 500 crunches and 100 pushups a day. Very well known legend in our town, the fittest of fit, non smoker. Chest Xray showed advanced incredibly rare type of lung cancer. No known successful treatment. She walked in to drop my son off right as I was pulling up the X-rays. My heart has never sunk that low. He [passed away] within 3 months.