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Bow-Tie Sign

Location

Knee

Diagnosis

Discoid meniscus

Discussion

Seen on sagittal images, the bow-tie represents the continuity of the meniscus between the anterior and posterior horns. It is normally seen on 2 contiguous sagittal images. When seen on 3 or more contiguous, 5-mm thick sagittal images, it is indicative of a discoid meniscus.

Reference

Araki Y, Yamamoto H, Nakamura H, Tsukaguchi I: MR diagnosis of discoid lateral menisci of the knee. Eur J Radiol 1994 May;18(2):92-5.

Silverman JM, Mink JH, Deutsch AL: Discoid menisci of the knee: MR imaging appearance. Radiology 1989 Nov;173(2):351-4.

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