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Medical Science Monitor Basic Research


Tuberculous Psoas Abscess and Worsening Vascular Aneurysm; All from Bacillus Calmette-Guerin (BCG) Therapy?

Unusual or unexpected effect of treatment, Rare disease, Adverse events of drug therapy , Educational Purpose (only if useful for a systematic review or synthesis)

Emmanuel Okon, Janelle Stearns, Arun Kumar Durgam

USA Department of Infectious Diseases, Marshfield Clinic, Eau Claire, WI, USA

Am J Case Rep 2017; 18:810-812

DOI: 10.12659/AJCR.903770

Available online:

Published: 2017-07-19


BACKGROUND: Intravesical bacillus Calmette-Guerin (BCG) is used in the treatment and prophylaxis of carcinoma in situ of the urinary bladder and for the prophylaxis of primary or recurrent stage Ta and T1 papillary tumors following transurethral resection. Significant systemic complications are rare but have been reported.
CASE REPORT: We describe this case of Mycobacterium bovis psoas abscess and worsening abdominal aortic aneurysm following BCG therapy for bladder cancer. A 76-year-old male presented with a fever of a few days. He had a computed tomography (CT) scan of abdomen and pelvis that showed left iliopsoas fluid collection measuring 6.7×3.8 cm and an abdominal aortic aneurysm that had almost doubled in size from 4.9 cm to 8.5 cm. The patient underwent CT-guided aspiration of the iliopsoas collection. Mycobacterium bovis was isolated from the aspirate cultures. He had received intravesical BCG therapy for bladder cancer a few years prior.
CONCLUSIONS: The rapid increase in the size of the abdominal aortic aneurysm (mycotic aneurysm) in our patient was most likely due to BCG therapy. The risk-benefit assessment of this treatment should be carefully considered especially in patients with a pre-existing vascular aneurysm.

Keywords: Aortic Aneurysm, Abdominal, Mycobacterium bovis, Psoas Abscess, Urinary Bladder Neoplasms