HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text MPEG Movies All Versions of this Article: e26v1 27/6/e26    most recent Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Runyan, B. R. Articles by Ortiguera, C. J. Search for Related Content PubMed PubMed Citation Articles by Runyan, B. R. Articles by Ortiguera, C. J. Related Collections Magnetic Resonance Imaging Musculoskeletal Radiology

Cyclops Lesions That Occur in the Absence of Prior Anterior Ligament Reconstruction¹

¹ From the Departments of Radiology (B.R.R., L.W.B., J.J.P., M.J.K., T.H.B) and Orthopedic Surgery (C.J.O.), Mayo Clinic, 4500 San Pablo Blvd, Jacksonville, Fla 32224. Presented as an education exhibit at the 2006 RSNA Annual Meeting. Received April 30, 2007; revision requested June 20; revision received and accepted July 27. All authors have no financial relationship to disclose. Address correspondence to B.R.R. (e-mail: Runyan.Brandon{at}mayo.edu).

Loss of full extension after anterior cruciate ligament (ACL) reconstruction, with development of an audible and palpable "clunk" with terminal extension was first described by Jackson and Schaefer as "cyclops syndrome." This syndrome, which is the result of a fibrous nodule (termed a cyclops nodule), has recently been described in patients who have sustained ACL injury but have not undergone reconstructive surgery. From 2001 to 2006, the authors identified 10 patients (five women and five men, ages 27–76 years) with cyclops nodules seen at magnetic resonance (MR) imaging. All patients had a history of trauma but no history of ACL reconstruction. The cyclops lesions had a mean size of 16 x 12 x 11 mm, with 90% of them located just anterior to the distal ACL. MR imaging showed a well-defined, somewhat heterogeneous soft-tissue nodule with a signal intensity typically similar to that of skeletal muscle. The authors suspect that the cause of cyclops lesions that occur in the absence of ACL reconstruction is similar to that suggested in the classic postoperative patient. Cyclops syndrome should be suspected in any patient in whom an ACL nodule is identified at MR imaging, and similarly a cyclops nodule should be considered as a possible cause of loss of extension in any patient who has sustained ACL injury.

Movies available at http://radiographics.rsnajnls.org/cgi/content/full/e26/DC1.