What Does It Mean If My X-ray Shows A Suspicious Faint Density Near The 4th Right Posterior Rib And Recommends A Chest ALV?

The result of my xray stated that a suspicious faint density is seen in the plane of the 4th posterior rib, right. The rest of the lung markings are prominent. The heart is not enlarged. The rest of the included structures are unremarkable. Conclusion Deferred. Chest ALV suggested. What does it mean? Please let me know. Thank you