Primary hydatid cyst of the neck: case report.

We present the case of a 52-year-old male patient, lacking relevant personal antecedents, who came to consultation due to a right latero-cervical mass that had grown slowly over the previous year; in the last few months, there had been neck pain radiating to the upper right arm. Physical examination revealed a 4--5 cm mass with well-defined borders at the level of the right jugulo-carotid chain (levels ii-iii). This was accompanied by neck pain radiating to the upper right arm and a slight sensory deficit in the area of the C2--C3 metameres. Cervical echography and CT showed a cystic mass with well-defined borders, lacking internal vascularisation, in the right prevertebral area, with anteromedial displacement of the vascular bundle connecting to the right paravertebral foramina. These findings were confirmed using NMR (Fig. 1). Given the inaccessibility of the cyst and the potential risk of rupture, fine-needle aspiration was omitted.