Authors present the case of a 65 year-old man without any remarkable previous illness, hospitalized because of having prolonged fever caused probably by an infection due to a tick bite. Tularaemia and bartonellosis based on serological results as well as neoplasm of the sigma with multiple metastases to the liver raised by ultrasonography and abdominal CT could be excluded with detailed investigations. Multiple abscesses of the liver were diagnosed, followed by a percutaneuos ultrasonography directed aspiration of one of the abscesses which resulted in 150 ml buffy pus. Microbiological examination evaluated the presence of Actinomyces meyeri. Instead of neoplasm, diverticulosis and diverticulitis of the sigma could be clarified with perforation of one of the diverticuli causing peridiverticulitis, retroperitoneal abscess and probably abscesses in the liver by haematogenous dissemination. Surgical intervention, resection of the liver and the sigma resulted in recovery of the patient. Difficulties of diagnosis are discussed in the article pointing out the importance of interdisciplinary collaboration, involving also infectologist. Diverticulosis of the sigma as presumably origin of hepatic actinomycosis is a literary curiosity. This was the cause of the case presentation.