Hydatid cyst signs

There are several signs of hydatid cysts seen associated with hydatid disease:

  • cumbo sign: air is seen between the pericyst and the laminated membrane of the cyst 
  • serpent sign: internal rupture of the cyst with collapse of membranes of the parasite into the cyst
  • water lily sign: endocyst floats freely in the cyst fluid 
  • spin sign / whirl sign: detached membranes with small pleural reaction seen in hydatid cyst of lung
  • empty cyst sign: may be seen after complete evacuation of parasitic membranes
  • crescent sign: when the hydatid cyst erodes the adjacent bronchus or bronchiole, the trapped air between the pericyst and the laminated membrane of the endocyst give a crescent-shaped rim of air around the cyst, thus is termed the crescent sign 4, 5.  when the crescent-shaped rim of air is noted at the lower edge of the cyst, it is called inversed crescent sign 4, 5.
  • honeycomb pattern: appearance of multivesicular cysts with multiple septa that represent the walls of daughter cysts
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Article information

rID: 19631
System: Chest
Section: Signs
Tag: cases, cases
Synonyms or Alternate Spellings:
  • Signs associated with hydatid disease

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Cases and figures

  • Case 1: honeycomb pattern
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