Many thanks to the nurses of the infectious disease department (Monica Cocchi, Lorenza Colella, Livia Davolio and Nicolina Solomita), whose help in the everyday medical practice permits us to complete the grey-scale sonography with intravenous injection of the contrast agents when needed.
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical standard
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. The patient provided written informed consent to enrolment in the study and to the inclusion in this article of information that could potentially lead to their identification.