Appendicular Mucocele - Classical Onion Skin Sign - On Ultrasonography

Appendicular Mucocele - Classical Onion Skin Sign - On Ultrasonography

Mucocele of Appendix in a 45 year old lady shows the  Classical Onion Skin Sign - On Ultrasonography.

Ultrasound

Aperistaltic anechoic /cystic sOL with layered internal echoes like onion skin or onion peels layering. The presence of an "onion sign" (sonographic layering within a cystic mass) is considered a highly suggestive feature.

CT
  • typically seen as a well-circumscribed, low-attenuation, spherical or tubular mass contiguous with the base of the caecum
  • the finding of curvilinear mural calcification suggests the diagnosis, but is seen in less than 50% of cases - which was present in our case.
  • intra-luminal bubbles of gas, or an air-fluid level within a mucocele suggest the presence of superinfection, which can occur in both benign and malignant mucocoeles

Pictures

Author

radiologist

Syed Nazir

Most Recent Articles