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DIAGNOSIS
a) Diagnostic Imaging:
i) Characteristic CXR findings:
-
one or more round/oval masses
-
homogenous
-
smooth borders
-
normal surrounding lung
May
see:
-
pleural reaction
-
atelectasis or mediastinal shift
-
lobulated cyst edges if impingement on relatively rigid anatomical structures
Rare:
-
calcification rarely seen
Special
signs uncommonly seen:
-
"crescent sign" (air between the pericyst and exocyst)
-
"Cumbo's sign" (parallel arches of air outlining the inner surface
of the cyst
-
"waterlily sign" (if the ruptured cyst communicates with the
tracheobronchial tree, there can be evacuation of the contents of the
cyst, and an air-fluid level can be seen with the endocyst appearing to
float in the remaining fluid)
ii)
CT scan
-
round cysts, homogeneous contents
-
density of water
-
thin, enhancing rim if cyst intact
-
occasionally see "daughter" cysts MRI has no advantage over
CT scan, however may have a role in investigating liver cysts in the identification
of changes in the intra and extrahepatic venous systems)
