The World Health Organization (WHO) classified the sonographic appearance of cystic echinococcosis (CE). This overlaps with the classification of Gharbi (above).
Sonographic Features
WHO
unilocular cyst with double line sign; unechoic
CE1
multiseptated cyst ("honeycomb", "rosette")
CE2
cyst with detached membranes ("water lily sign")
CE3a
cyst with solid matrix and daughter cysts
CE3b
cyst with heterogenous contents (hyperchoic and/or hypoechoic)
CE4
solid with calcified wall
CE5
WHO
Gharbi Type
CE1
I
CE2
III
CE3a
II
CE3b
NA
CE4
IV
CE5
V
WHO
Biological Activity
CE1
active
CE2
active
CE3a
transitional
CE3b
transitional
CE4
inactive
CE5
inactive
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