incidence . present in 3-5% of population; etiology . failure of apoptosis in utero ; location . usually lateral meniscus involved; 25% bilateral; Classification Discoid Lateral Meniscus; Freiberg's Disease; Evolution; Synovial Osteochondromatosis; MS presenting with severe headache; Rotator Interval Tear; CT IVP; Subdural Haemorrhage Acute on Chronic June (3) May (4) April (14) March (9) February (2) January (9) 2008 (41) 2008-03-15 2018-09-24 THE DISCOID LATERAL MENISCUS (DLM) is an anatomic variant of the meniscus, in which the meniscus is thickened and discoid shaped, and the DLM covers a … MR imaging of tears of discoid lateral menisci.

In imaging examination, MRI depicted a characteristic image of a partial meniscal defect in the sagittal view. Discoid meniscus Clinical presentation. Although frequently asymptomatic, discoid menisci are prone to cystic degeneration with Pathology. Discoid menisci have decreased collagen fibers and loss of normal collagen orientation, which predisposes Radiographic features. Radiographs may well A discoid meniscus was said to be present if three or more 5-mm-thick contiguous sagittal images demonstrated continuity of the meniscus between the anterior and posterior horns. High-resolution coronal images allowed more graphic depiction of the abnormally wide meniscus. The most prominent distinguishing features of discoid lateral meniscus on plain radiographs include widening of the lateral joint space and a high fibular head.

When diagnosing a DM on MR imaging, identification of tears and signs of instability is of utmost importance. Discoid meniscus is fairley common in children on clinical examination to come with snapping sounds of the knees.Clinical examination shows a senstivity of 88 % v/s an MRI sensitivity of only 38 % in various series. There are 3 varieties – complete, incomplete and wrisberg variant.

Diagnosing DM on MR imaging has clinical and surgical implications.

MRI shows a discoid lateral meniscus wi Discoid meniscus is an abnormality in which the cartilaginous meniscus is differently shaped, thick, and contains less collagen. It is mostly seen in children; and in the adult, it is rarely symptomatic. We have certain knowledge of discoid meniscus shape, its ultrastructure, epidemiology, and pathology. The discoid shape of the meniscus, which is seen mostly on the lateral meniscus, is Developed by renowned radiologists in each specialty, STATdx provides comprehensive decision support you can rely on - Discoid Meniscus Kato et al.
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Discoid meniscus is thought to arise secondary to an abnormal inferior fascicular attachment of the posterior horn, resulting in additional central meniscal growth and subsequent discoid configuration.

So it is of great importance to know the presence of meniscal tears with DLM in presurgical planning.
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The ultrastructure of discoid menisci differs from that of normal menisci ; this difference in collagen fiber organization and the stress redistribution Discoid meniscus (DM) is currently considered as a spectrum of disorders in meniscal shape and stability. Diagnosing DM on MR imaging has clinical and surgical implications.

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Samoto N, Kozuma M, Tokuhisa T, Kobayashi K. Diagnosis of discoid lateral meniscus of the knee on MR imaging. Tears are more common with the complete discoid meniscus variant and often display horizontal or longitudinal tear patterns . MR imaging has widely variable sensitivity and specificity for detection of tears within a discoid meniscus because of the increased meniscal vascularity and diffuse intrameniscal signal intensity (34,35). Therefore Discoid lateral meniscus (DLM) is a common anatomic variant in the knee typically presented in young populations, with a greater incidence in the Asian population than in other populations. As DLM is a congenital anomaly, the ultrastructural features and morphology differ from those of the normal meniscus, potentially leading to meniscal tears. At first impression this looks like a tear within a discoid meniscus.

Ari Youderian, MD, Margaret A. Stull, MD.Discoid lateral meniscus.Applied Radiology. 2008:30-32. Paul M Aichroth, Dipak V Patel et al. Congenital discoid lateral meniscus in children. The J Bone Joint Sur 1997;73(B)6:932-935; Darin Davidson, Merv Letts, Rob Glasgow. Discoid meniscus in children: treatment and outcome. Can J Surg.

MRI confirmed a torn discoid lateral meniscus.