<prompt> Hammans sign is seen with:Acute pericarditisAortic dissectionTracheal compressionEsophageal perforation  <response>: Ans. d Esophageal perforation. Ref. Harrisons medicine 16th ed. 1569Hammans sign Laennec-Hamman symptom, Laennec-Miiller-von Bergmann, Hammans crunch A crunching, rasping sound, synchronous with heartbeat, heard over the precordium and sometimes at a distance from the chest in spontaneous mediastinal emphysema. Hammans sign may be present in acute mediastinitis, for e.g. as in esophageal perforation. It is a crunching sound that is heard over the anterior chest in synchrony with cardiac systole. 