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Updated: Nov 25, 2025

Refined Murine Model of Idiopathic Pulmonary Fibrosis
Published on: June 17, 2025
Severe pneumonia with formation of a pulmonary cavity associated with long-term rituximab therapy in multiple
1Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Gudrunstr. 56, 44791 Bochum, Germany.
Abstract:
Nowadays B-cell depletion via anti-CD20 antibodies is commonly applied in the treatment of multiple sclerosis (MS). Yet, not much is known about infection risks associated with long-term B-cell depletion in the specific context of MS. We present the case of a 45-year-old male patient who developed severe pneumonia following 6 years of rituximab treatment for highly active relapsing-remitting MS. The patient had no additional chronic disease as well as no history of foreign travel. Although the unusual formation of a pulmonary cavity raised suspicion for tuberculosis, repeated testing via bronchoscopy and sputum remained negative. Prolonged antibiotic therapy with piperacillin/tazobactam and amoxicillin/ clavulanate led to complete recovery from symptoms. This case shows the potential risk of serious infections following continuous B-cell depletion in MS and illustrates the importance of future vigilance.
Insights
Long-term B-cell depletion therapy for multiple sclerosis (MS) may increase the risk of severe infections. This case highlights the need for vigilance regarding potential serious infections, such as pneumonia, in MS patients undergoing B-cell depletion treatments.
Area of Science:
- Immunology
- Neurology
- Infectious Diseases
Background:
- B-cell depletion using anti-CD20 antibodies is a standard treatment for multiple sclerosis (MS).
- The long-term infection risks associated with B-cell depletion in MS patients are not fully understood.
Purpose of the Study:
- To present a case of severe pneumonia in an MS patient following long-term B-cell depletion.
- To emphasize the importance of recognizing infection risks in MS patients undergoing continuous B-cell depletion therapy.
Main Methods:
- Case report of a 45-year-old male with relapsing-remitting MS treated with rituximab for 6 years.
- Diagnostic workup included bronchoscopy and sputum testing to rule out tuberculosis.
- Treatment involved prolonged antibiotic therapy.
Main Results:
- The patient developed severe pneumonia with an unusual pulmonary cavity formation.
- Tuberculosis was ruled out despite initial suspicion.
- Complete recovery was achieved with broad-spectrum antibiotics.
Conclusions:
- Continuous B-cell depletion in MS patients carries a risk of serious infections like severe pneumonia.
- Vigilance and prompt diagnosis are crucial for managing infections in this patient population.
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