Mucoceles are cystic masses that generally affect the sinuses. It occurs as a result from obstruction of the ostium of a sinus and consequential accumulation of mucus. Frontal and ethmoid sinuses are mostly affected. Usually, the clinical symptoms are insidious, varying with the extent of the affected region. The treatment is surgical and endoscopic surgery is the method of choice in most cases. The present study is aimed at describing the main characteristics of paranasal sinuses mucoceles, demonstrating and illustrating a series of atypical presentations with emphasis on imaging findings.

A artéria estapedial persistente é uma rara anomalia congênita que ocorre por uma falha na sua involução. A maioria dos pacientes com artéria estapedial persistente é assintomática. O diagnóstico de imagem é feito principalmente pela tomografia computadorizada multidetectores. Neste estudo a artéria estapedial persistente foi um achado ocasional no exame tomográfico. São discutidos a embriologia, os achados tomográficos e a importância do seu diagnóstico precoce.

Persistent stapedial artery is a rare congenital anomaly that occurs by a failure in the involution of such artery. Most patients with persistent stapedial artery are asymptomatic. The imaging diagnosis is made principally by means of multidetector computed tomography. In the present case, persistent stapedial artery was an incidental computed tomography finding. The authors discuss the embryogenesis, computed tomography findings and the importance of an early diagnosis of such anomaly.