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Case report
Parvimonas micra spondylodiscitis with psoas abscess
  1. Li Jie Helena Yoo1,
  2. Muhamad Danial Zulkifli2,
  3. Margaret O'Connor2 and
  4. Ruth Waldron3
  1. 1 Department of Internal Medicine, University Hospital Limerick, Limerick, Ireland
  2. 2 Department of Therapeutics and Ageing, University Hospital Limerick, Limerick, Ireland
  3. 3 Department of Microbiology, University Hospital Limerick, Limerick, Ireland
  1. Correspondence to Dr Li Jie Helena Yoo; lijiehelena.yoo{at}


Parvimonas micra (P. micra) is a Gram-positive anaerobic cocci, normally found in the oral cavity and rarely causes severe infections. We describe a rare clinical presentation of P. micra as spondylodiscitis and psoas abscess with haematogenous spread in an adult patient. MRI lumbar spine detected L2 and L3 spondylodiscitis. Blood cultures were positive at 48 hours of incubation and P. micra was identified on anaerobic culture after 72 hours. Isolates from bone biopsy confirms P. micra. She was successfully treated with ceftriaxone, followed by oral metronidzole for a total of 8 weeks. The suspected origin of her P. micra was a dental cavity. Anaerobic bacteria tend to be underestimated in spondylodiscitis. In cases of slow growing organisms, we emphasise the importance of performing accurate identification including anaerobic bacteria to guide management. P. micra should be considered in patients with spondylodiscitis who had recent dental intervention or perioral infection.

  • bone and joint infections
  • unwanted effects / adverse reactions
  • dentistry and oral medicine
  • orthopaedics
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  • Contributors LJHY drafted the initial manuscript. MDZ and MO were involved in direct patient care, edited and reviewed redrafts of the manuscript. RW reviewed drafts and contributed to writing and revision. All authors approved the final approval of the version to be published.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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