Figure 3. Comparison of Gharbi's and WHO-IWGE ultrasound classifications of CE cysts.

CL, as a potentially parasitic cyst, was not in Gharbi's classification and needs to be differentiated from non-parasitic cysts. This may also happen with CE1 cysts, when the double layer sign is not evident. Also, WHO CE3b had not been explicitly described by Gharbi but could likely be classified as Type III.