The sonographic findings in alveolar echinococcosis (AE) and cystic echinococcosis (CE) are complex and can pose significant differential diagnostic problems. They may present like complicated cysts or malignant tumors in the liver. We will discuss the diagnostic difficulties and pitfalls of these two diseases based on case histories.

The HRQoL in people with AE is reduced in comparison with a control population. Assessment of the physical and mental quality of life in patients with AE may help to evaluate the patient outcome.

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In the above-mentioned article, some sentences in the following paragraphs were incorrect. Correct: English: WHO stages CE1 and CE2 are considered active and in need of treatment, stages CE3a and CE3b are considered intermediate, and stages CE4 and CE5 are considered inactive and not requiring treatment. However, stage CE4 should be followed up for a longer period of time when a new diagnosis is made, as stage CE4 can develop into stage CE3b again [4] (Fig. 20). German: Die WHO-Stadien CE1 und CE2 gelten als aktiv und behandlungsbedürftig, die Stadien CE3a und CE3b als Intermediärstadien und die Stadien CE4 und CE5 als inaktiv und nicht behandlungsbedürftig. Das Stadium CE4 sollte jedoch bei Neudiagnose für längere Zeit nachbeobachtet werden, da sich in einem Stadium CE4 wieder ein Stadium CE3b ausbilden kann [4] (Abb. 20). English: Fig. 20 WHO CE stage 4. A WHO CE3b stage recurrence is found centrally in this lesion. German: Abb. 20 WHO-CE Stadium 4. Zentral findet sich in dieser Läsion ein WHO-CE3b-Stadium als Rezidiv. English:Frequently, only a singular cyst is detectable in CE. In contrast, simple dysontogenetic liver cysts often occur in greater numbers (Fig. 24) [22]. As a typical sign, a more vigorous and hyperechoic cyst wall can be detected in WHO stage CE1 cystic echinococcosis. This was corrected in the online version on 11.03.2022.