Clinical Scenario

Disseminated nocardiosis with central nervous system involvement presenting as cerebral abscess. The most common site of haematogenous dissemination in nocardiosis is the central nervous system, where it typically manifests as one or more cerebral abscesses.

Previous Treatment — Goal Not Achieved

Initial management with empiric combination therapy with higher dosing and CNS-penetrating agents has not reached its required endpoint: radiographic resolution of the cerebral abscess on follow-up brain imaging. This protocol addresses the next clinical step taken after that failure.

Next-Step Treatment Approach (Partial Overview)

When initial CNS combination therapy has not led to radiographic resolution, the approach shifts to susceptibility-guided alternative antimicrobial therapy. Adjustment of immunosuppression — reducing or holding it where clinically safe — is also a key consideration in this setting.

Full regimen details, agent selection, sequencing, and decision criteria are available in the complete structured protocol.

References

DOI: 10.1093/cid/ciae643

The most common site of dissemination is the central nervous system (CNS), typically manifesting as cerebral abscesses.
Patients with TMP-SMX toxicity and yet-to-improve severe infection may be better served transitioning to alternative therapy, as patients with severe nocardiosis are underrepresented in the available data.
Linezolid is uniquely susceptible in vitro to essentially all Nocardia isolates.
Reduction in immunosuppression is often performed for severe disease, though evidence supporting this is limited.
Immunosuppression should be lowered or held if it can be done safely, recognizing the competing risks of rejection and graft-versus-host disease in transplant populations.

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Disseminated Nocardiosis with Cerebral Abscess: When Initial CNS Combination Therapy Has Not Achieved Radiographic Resolution

References