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Case Reports in Infectious Diseases
Volume 2017, Article ID 9704790, 5 pages
Case Report

Actinomyces meyeri Popliteal Cyst Infection and Review of the Literature

Division of Infectious Diseases, Mayo Clinic 200, First Street SW, Rochester, MN 55905, USA

Correspondence should be addressed to Ala S. Dababneh; ude.oyam@ala.henbabad

Received 2 November 2016; Revised 27 December 2016; Accepted 16 January 2017; Published 31 January 2017

Academic Editor: Gernot Walder

Copyright © 2017 Bharath Raj Palraj and Ala S. Dababneh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A 66-year-old, Caucasian male presented with pain and swelling involving the left knee of one-week duration. Arthrocentesis was negative for evidence of septic arthritis. Magnetic resonance imaging (MRI) study of the left knee showed degenerative arthritis, partial tear of medial meniscus, and a complex fluid collection along the posteromedial aspect of the left knee suggestive of popliteal cyst. He underwent arthroscopy with partial medial meniscectomy. Intraoperative joint fluid was noted to be cloudy but cultures were negative. Arthroscopic procedure provided him with temporary relief but the pain and swelling in the posterior aspect of the left knee recurred in 6 weeks. Repeat MRI showed complex fluid collection in the posterolateral aspect of left knee. Ultrasound guided aspiration of the fluid collection revealed purulent material and cultures grew Actinomyces meyeri. He was treated with 6 weeks of intravenous penicillin regimen followed by 18 months of oral penicillin.