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The involvement of the pituitary stem frequently encountered since the development of pituitary imaging is revealed by diabetes insipidus in the majority of cases. The pituitary stem can be the target of various pathologies, infectious, infiltrative, and tumor. In cases where the etiological investigation is negative, genetic abnormalities may be incriminated. Through our case we show the variability of conditions that can reach the pituitary stem as well as the role of imaging in the etiological investigation to arrive at hypotheses requiring confirmation at histology or close monitoring of lesions.

Hydatid Disease (HD) is a mild endemic disease caused by ecchinococus granulosus. It can affect any system of the body, with hepatic predilection [1,2]. Most often asymptomatic, the literature describes 5 evolutionary stages ranging from simple cysts, with it poses a problem of differential diagnosis in its simple form to complicated forms that may or may not be calcified. It is made up of three sofas; the pericyst, ectocyst, and endocyst. The CT scan plays an important role in imaging complicated hydatid cysts. The most common are rupture and superinfection. Occurring in 50 to 90% of cases, the rupture can be communicative or contained. When contained, the endocyst detaches from the pericyst appearing as a curvilinear structure or floating membranes which may subsequently calcify. This aspect is found on ultrasound, or on a CT scan [1,3]. The case on this hepatic ultrasound (Figure 1A) generated a grossly oval lesion, containing calcified serpiginous structures (floating membranes), generating shadow cones which mask the posterior reinforcement of this non-vascularized fluid mass on color Doppler (yellow star).