Aneurysmal bone cysts have been described as pseudocysts in view of their lack of an epithelial lining. These cysts are uncommon, but when they do occur they typically involve the long bones of the extremities, the membranous bones of the thorax and pelvis, and the vertebrae. Skull involvement is uncommon. We present the case of a 14-year-old girl who presented with nasal obstruction and a swelling of the right cheek. Contrast-enhanced computed tomography detected a heterogeneous cystic mass involving the sphenoid and ethmoid bones. The mass was excised via a lateral rhinotomy approach, and it was identified as an aneurysmal bone cyst on histologic examination. The patient experienced a recurrence in the right sphenoid sinus within 3 months, and the lesion was removed via transnasal endoscopy.

Hydatid disease is a zoonotic infestation caused by larval cestode of genus Echinococcus. Cystic form of this infection mostly involves liver and lung. Hydatid disease of the parotid gland is very rare even in endemic areas and is often clinically mistaken for parotid tumors or cysts. The presence of protoscolices, laminated membranes, and isolated hooklets are characteristic cytological features observed on fine-needle aspirate from hydatid cysts. We report unusual cytological features from a hydatid cyst of parotid in a 13-year-old girl. She presented with a slowly enlarging hard mass in left parotid. Fine-needle aspiration yielded slightly turbid fluid. Smears from the sediment revealed naked parasitic micronuclei, fragments of germinative layer (endocyst), and abortive brood capsules (buds from endocyst) seen as spherical structures with multiple parasitic nuclei. Some of these spherical structures were degenerated with recognizable nuclei and others were completely necrotic. Diagn. Cytopathol. 2016;44:770-773. © 2016 Wiley Periodicals, Inc.