Directions:

1. print this page

2. Fold the paper along the thick gray line

3. Look at one side, guess the answer, flip it over to check the answer

Meniscus/moon/air crescent /double arch sign/combo sign/water lilly/Calmalotte sign/serpent sign /rising sun sign/empty cyst sign | Hydatid cyst of lung |

Popcorn calcification | Hamartoma , Mediastinal nodes of histoplasmosis |

Werstermark sign, Hampton's hump, Palla sign , Fleischner lines, Felson sign | Pulmonary thromboembolism |

Sail sign , Mulvay sign, Notch sign | Thymic enlargement |

Comet tail sign | Rounded Atelectasis |

Golden S sign | Right upper lobe collapse secondary to a central mass |

Luftsichel sign , Broncholobar sign | Left Upper lobe collapse |

Ring around artery sign, Continuous diaphragm sign, Tubular artery sign, Double bronchial wall sign, V Sign of Naclerio, Spinnaker sail sign | Pneumo mediastinum |

Deep sulcus sign , Visceral pleural line | Pneumothorax |

Thumb sign | Epiglottitis |

Steeple sign | Croup |

Air crescent sign, MONOD Sign | Aspergilloma |

Bulging Fissure Sign | Klebsiella Pneumonia |

Batwing sign on CXR | Pulmonary oedema |

Collar sign, Dependent viscera sign | Diaphragmatic rupture |

Feeding vessel sign | Pulmonary Septic emboli |

Finger in Glove Sign | ABPA |

Halo sign | Aspergillosis |

Head Cheese sign | Subacute Hypersensitivity pneumonitis |

Juxtaphrenic peak sign | Right Upper Lobe Atelectasis |

Reversed HALO Sign | Cryptogenic organized pneumonia |

Saber sheath sign | COPD |

Sandstorm lungs | Alveolar microlithiasis |

Signet ring sign | Bronchiectasis |

Superior triangle sign | Right Lower Lobe Atelectasis |

Split Pleura Sign | Empyema |

Tree in Bud sign on HRCT | Endobronchial spread in TB |