Solve a diagnostic puzzle: This is the case of a real patient treated at a Boston-area hospital

On Dec. 5, Mr. G and his wife left the cold and snowcaked city of Worcester to celebrate their wedding anniversary in balmy Puerto Rico. After landing in San Juan, they met their host family. The cordial hosts — D and M — had offered Mr. and Mrs. G a spare room at the far end of the house. The accommodations were comfortable and secure.