Stroke-Associating Acute Limb Ischemia Due to the Rupture of a Hydatid Cyst.

(1) Background: Hydatidosis, or human cystic echinococcosis, is a zoonotic disease. Endemic in some areas, recently it has an increasing incidence in wider regions, determined by population migration. Clinical features depend on the localization and level of infection: asymptomatic or with signs related to hypersensitivity, organic functional deficiencies, expanding mass effects, cyst infection and sudden death. In rare cases, the rupture of a hydatid cyst causes emboli formation by the residual laminated membrane. (2) Methods: We performed an extensive literature review, starting from the case of a 25-year-old patient presenting with neurologic symptoms relevant for acute stroke, associating right upper limb ischemia. (3) Results: Imaging investigations revealed the source of the emboli as the rupture of a hydatid cyst, the patient presenting multiple pericardial and mediastinal localizations. Cerebral imaging confirmed an acute left occipital ischemic lesion, with complete recovery of the neurological deficit after therapy, while surgery for acute brachial artery ischemia had a favorable postoperative evolution. Specific anthelmintic therapy was initiated. An extensive literature review using available databases revealed the scarcity of data on embolism as a consequence of cyst rupture, highlighting the significant risk of clinicians overlooking this possible etiology. (4) Conclusions: An associated allergic reaction should raise the hypothesis of a hydatid cyst rupture as a cause of any level acute ischemic lesion.