RT Journal Article SR Electronic(1) A1 Ahmed, Wissam A1 Dewar, Simon A1 Williams, Robin A1 Stansby, Gerard A1 Harris, Kathryn A1 Weiand, DanielYR 2021 T1 Lawsonella clevelandensis is a rare cause of infected chronic contained rupture of abdominal aortic aneurysm JF Access Microbiology, VO 3 IS 1 OP SP 000183 DO https://doi.org/10.1099/acmi.0.000183 PB Microbiology Society, SN 2516-8290, AB Lawsonella clevelandensis is an anaerobic, partially acid-fast, Gram-positive bacillus associated with abscess formation. We present the case of a 70-year-old male with chronic contained rupture of abdominal aortic aneurysm (CCR-AAA) complicated by intra-abdominal abscess formation. An abdominal computed tomography scan revealed a rim-enhancing retroperitoneal collection tracking into the subcutaneous layer of the left flank and buttock, suggestive of CCR-AAA with infected haematoma. He underwent ultrasound-guided needle aspiration of the intra-abdominal collection. Conventional culture techniques failed to isolate L. clevelandensis , and the diagnosis was only confirmed by means of 16S rRNA PCR. The patient underwent branched endovascular repair of his aneurysm, and was commenced on treatment with co-amoxiclav, resulting in significant reduction in the size of the infected collection. This is only the second reported case of infection with L. clevelandensis in the UK, and the first reported case of this organism causing infected CCR-AAA., UL https://www.microbiologyresearch.org/content/journal/acmi/10.1099/acmi.0.000183