Proposal of an ultrasonographic classification for hepatic alveolar echinococcosis: Echinococcosis multilocularis Ulm classification-ultrasound

Table 1 Patient characteristics n (%)

Characteristics	mean ± SD
Number of patients	185
Gender
Female	100 (54.1)
Male	85 (45.9)
Age at diagnosis	51.4 ± 17.6
Age at ultrasonographic examination	58.7 ± 18.2
Sonomorphological classification
Hailstorm	100 (54.1)
Pseudocystic	25 (13.5)
Ossification	24 (13.0)
Hemangioma-like	15 (8.1)
Metastasis-like	12 (6.5)
Unclassifiable	9 (4.9)
Number of lesions
1	116
2	24
3	16
4	5
5	7
6-10	4
> 10	13
Mean diameter of the largest lesion	62.5 ± 40.4
Mean lesion diameter according to sonomorphological classification
Hailstorm	59.6 ± 27.9
Pseudocystic	120.0 ± 47.3
Ossification	28.0 ± 19.4
Hemangioma-like	68.1 ± 37.3
Metastasis-like	35.3 ± 33.1
Unclassifiable	53.9 ± 30.6
Localization of the largest lesion (hepatic lobe)
Right	113 (61.1)
Left	58 (31.4)
Both	14 (7.6)
Calcification
No	47 (25.4)
Yes	138 (74.6)
Affected liver segments (multiple segments possible)
I	6 (3.2)
II	19 (10.3)
III	22 (11.9)
IVa	30 (16.2)
IVb	28 (15.1)
V	44 (23.8)
VI	41 (22.2)
VII	44 (23.8)
VIII	41 (22.2)
Steatosis hepatis
No	147 (79.5)
Yes	38 (20.5)
Liver size in mid-clavicular line (mm)	146.1 ± 25.2