<prompt> Air under central tendon of diaphragm isAir under diaphragm signCupola signDoges cap signFalciform ligament sign  <response>: The Cupola sign is seen on a supine chestabdominal radiograph in the presence of pneumoperitoneum. It refers to non-dependent gas that rises within the abdominal cavity of the supine patient to accumulate underneath the central tendon of the diaphragm in the midline. 