Symptomatic ring-shaped lateral meniscus. MRI findings.

Koukoulias, Nikolaos E.; Papastergiou, Stergios

doi:10.1136/bcr.10.2011.4914

Cited by 10 publications

(10 citation statements)

References 10 publications

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“…Other signs such as the double PCL sign may be observed on sagittal MRIs of a BHT 15 . The inner edge of a central discoid meniscus tear or a BHT often appears irregular in contrast to the sharp, tapering, triangular characteristics of an RSM on an MR film 10 . The first patient also had a widened lateral compartment, which is usually associated with a discoid meniscus 16 (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…I n most cases, RSMs usually present incidentally during arthroscopic procedures 4 . This is because RSMs are usually asymptomatic 10 . In our review, we identified only 4 symptomatic cases of RSMs that have been reported in the literature thus far 8,10,12,13 .…”

Section: Discussionmentioning

confidence: 99%

“…This is because RSMs are usually asymptomatic 10 . In our review, we identified only 4 symptomatic cases of RSMs that have been reported in the literature thus far 8,10,12,13 . Notably, in 3 of these cases, 10,12,13 the RSMs presented concomitantly with symptomatic parameniscal cysts, which are associated with horizontal cleavage tears.…”

Section: Discussionmentioning

confidence: 99%

“…In discoid menisci, intrasubstance degeneration of meniscal tissue is often seen. This results in horizontal meniscal tears and cysts appearing in patients late teens to early adulthood 10,12,13 . This helps confirm that RSMs are a discoid meniscus variant as suggested by Monllau et al 4 There are reports of RSMs being initially misdiagnosed for a BHT of the lateral meniscus 13,14,23 .…”

Section: Discussionmentioning

confidence: 99%

“…On literature review, the difficulty in distinguishing between an RSM and other meniscal pathologies has been documented. It is especially difficult to differentiate between an RSM and a displaced bucket handle tear (BHT) of the lateral meniscus [9][10][11] because of their similar appearance on magnetic resonance imaging (MRI) 4,12 . Iqbal et al demonstrated this among other aspects of RSM MRI in their case series of 6 9 .…”

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confidence: 99%

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Ring-Shaped Meniscus, MRI Features, and Diagnosis

Mitra,

Lee

2023

JBJS Case Connector

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Case: A ring-shaped meniscus (RSM) is a rare malformation of debatable origin usually occurring on the lateral meniscus. Here, we present 2 cases of RSM with differing etiologies and discuss the current literature on the topic. These reports may help with the identification of RSMs in the future and assist in understanding the true etiopathogenesis of individual cases. Conclusion: These 2 cases exemplify the variation in presentations of ring-shaped menisci and their radiological features on both x-ray and magnetic resonance imaging. This reinforces the idea that there may be both a congenital and an iatrogenic etiology to this rare condition.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Ring-Shaped Meniscus, MRI Features, and Diagnosis

Mitra,

Lee

2023

JBJS Case Connector

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Evaluation of the morphological variations of the meniscus: a cadaver study

Ryu

Iriuchishima²,

Oshida

et al. 2013

Knee Surg Sports Traumatol Arthrosc

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Ring-shaped lateral meniscus with hypoplasic anterior cruciate ligament

et al. 2015

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Knee joint lesions can be solitary or occur concomitantly with other lower limb abnormalities. Ring-shaped lateral meniscus (RSM) and hypoplasic anterior cruciate ligament (ACL) are two rare malformations. The therapeutic management of such abnormalities is not consensual, and highly depends on clinical symptomatology. We report a case of a 25-year-old girl with progressive knee pain whose MRI demonstrated a continuous segment of lateral meniscus situated along the medial aspect of the lateral compartment, continuous with the otherwise normal-appearing lateral meniscus, compatible with an RSM. This anatomic variant can be mistaken by a displaced meniscal fragment, like a bucket-handle tear, a central tear of a discoid meniscus, or incomplete discoid meniscus, as previously reported. Her MRI examination also showed a thinned ACL with anomalous lateral course. This abnormality may be mistaken for an ACL rupture and/or a meniscofemoral ligament with agenesis of ACL. Multiple images in different planes as well as following the course of meniscal and ligaments are critical clues to avoid misdiagnosis. As a result, the diagnosis of an RSM along with hypoplasic ACL with abnormal attachment was assumed based on MRI and confirmed during arthroscopy. The patient was treated conservatively with clinical outcome improvement.

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Symptomatic ring-shaped lateral meniscus. MRI findings.

Cited by 10 publications

References 10 publications

Ring-Shaped Meniscus, MRI Features, and Diagnosis

Ring-Shaped Meniscus, MRI Features, and Diagnosis

Evaluation of the morphological variations of the meniscus: a cadaver study

Ring-shaped lateral meniscus with hypoplasic anterior cruciate ligament

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