Citation, DOI & article data
A ghost meniscus, also known as the empty meniscus sign, refers to either a complete radial tear that has transected the meniscus, a displaced root avulsion or, alternatively, be due to a previous meniscectomy.
Defined by the presence of a meniscus which disappears then reappears like a 'ghost' on consecutive sagittal sequences. This occurs when the slice plane is exactly in line with the meniscal tear/ gap, and on MRI produces complete or near-complete signal loss on from the involved meniscus from partial volume averaging or even a complete absence of the meniscus when there is a large-sized defect.
The terms complete radial tear and transection of the meniscus are used interchangeably to describe the same pathology.
- complete radial tears and root avulsions should be suspected if the central third of the meniscus is extruded
- stating the quality of the articular cartilage adjacent to the tear is important to guide further management
- the posterior third and posterior horns are more commonly affected
- often the extruded central third of the meniscus will cause the medial collateral ligament to bow outwards
- 1. Petersen W, Forkel P, Feucht MJ et-al. Posterior root tear of the medial and lateral meniscus. Arch Orthop Trauma Surg. 2014;134 (2): 237-55. doi:10.1007/s00402-013-1873-8 - Pubmed citation
- 2. Davies AM, Cassar-Pullicino VN. Imaging of the Knee. Springer Science & Business Media. (2012) ISBN:3642559123. Read it at Google Books - Find it at Amazon