Aneurysmal bone cyst of the zygomatic arch: a case report.

We describe a case of an aneurysmal bone cyst originating from the zygomatic arch, which, according to the literature, is an extremely rare location. In the preoperative diagnosis the characteristic radiological signs of the high-quality computed tomography and magnetic resonance examinations were the cornerstones. Treatment was successful total excision.

Subcutaneous hydatid cyst in the popliteal fossa at the site of a previous wasp sting.

We report an uncommon case of a primary Echinococcus cyst that developed in the subcutaneous tissue of the right popliteal fossa, at the spot of a previous wasp sting, suggesting the possibility of an unusual transmission of the eggs by insects. This unusual presentation was initially considered as a Baker cyst until parasytological results verified Echinococcus hydatidosus, the larval form of Echinococcus granulosus, as diagnosis. However, the most common path of Echinococcus granulosus infection is through contact with a definitive host or by ingestion of ova through contaminated water or food.