English: Chest X-ray of hyperinflated lung (9th anterior rib intersecting with the diaphragm. Normally, only the 6th rib will intersect with the diaphragm and the ribs below it will appear below the diaphragm) with bronchiectasis at the right hilum and right upper lobe of a 12 year old boy. Right hilum is at the same level as the left hilum which signifies right hilum elevation (left hilum is higher than the right hilum a normal chest X-ray). The most common cause of right hilum elevation is right upper lobe collapse (not seen in this study). Reverse "7" or "7" sign of the bilateral ribs which signifies pectus excavatum. When horizontal posterior ribs meets with the anterior ribs, the resultant shape is similar to a "7" on the left lung, and mirror image of "7" in the right lung. A normal chest X-ray usually shows posterior rib curves downwards to meet with the anterior rib. Thus, this patient may have bronchiolitis obliterans with underlying pectus excavatum.