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The diagnosis of multiple opportunistic infections in advanced stage AIDS: when Ockham's Razor doesn't cut it
Marcos Vinicius Cardoso Pinheiro1, Yeh-Li Ho2, Antonio Carlos Nicodemo2
1Universidade de São Paulo, Faculty of Medicine, Department of Anatomic Pathology . São Paulo, SP , Brazil .
Abstract:
In the advanced stage of AIDS, the diagnosis of the opportunistic infections may be challenging due to the high risk of performing invasive diagnostic methods in a patient with a critical clinical condition, as well as the correct interpretation of the results of microbiological exams. One of the challenges for the diagnosis and treatment of the opportunistic infections is that they may occur concomitantly in the same patient and they may mimic each other, leading to a high discrepancy between clinical and autopsy diagnoses. We describe the case of a 52-year-old man who was hospitalized because of weight loss, anemia, cough, and hepatosplenomegaly. During the investigation, the diagnosis of AIDS was made, and the patient developed respiratory failure and died on the fourth day of hospitalization. At autopsy, disseminated non-tuberculosis mycobacteriosis was found, affecting mainly the organs of the reticuloendothelial system. Also, severe and diffuse pneumonia caused by multiple agents (Pneumocystis jirovecii , Histoplasma capsulatum, suppurative bacterial infection, non-tuberculosis mycobacteria, and cytomegalovirus) was seen in a morphological pattern that could be called "collision pneumonia." The lesson from this case, revealed by the autopsy, is that in advanced AIDS, patients often have multiple opportunistic infections, so the principle of Ockham's razor-that a single diagnosis is most likely the best diagnosis-fails in this clinical context.
Insights
In advanced AIDS, diagnosing opportunistic infections is difficult due to patient condition and overlapping symptoms. Autopsy revealed multiple concurrent infections, challenging the single-diagnosis principle.
Area of Science:
- Infectious Diseases
- Pathology
- Immunology
Background:
- Diagnosing opportunistic infections in advanced Acquired Immunodeficiency Syndrome (AIDS) presents significant challenges.
- These challenges stem from the critical clinical state of patients, risks associated with invasive procedures, and difficulties in interpreting microbiological results.
- Opportunistic infections can co-occur and mimic each other, leading to discrepancies between clinical and autopsy diagnoses.
Observation:
- A case study of a 52-year-old male patient hospitalized with weight loss, anemia, cough, and hepatosplenomegaly.
- The patient was diagnosed with AIDS and subsequently developed respiratory failure, leading to death.
- Autopsy revealed disseminated non-tuberculosis mycobacteriosis and severe pneumonia caused by multiple pathogens, termed 'collision pneumonia'.
Findings:
- The autopsy identified disseminated non-tuberculosis mycobacteriosis affecting the reticuloendothelial system.
- The patient had severe, diffuse pneumonia caused by a combination of *Pneumocystis jirovecii*, *Histoplasma capsulatum*, bacteria, non-tuberculosis mycobacteria, and cytomegalovirus.
- This case highlights the frequent occurrence of multiple opportunistic infections in advanced AIDS.
Implications:
- The principle of Ockham's razor, favoring a single diagnosis, is often inapplicable in advanced AIDS.
- Clinicians must consider the possibility of multiple, concurrent opportunistic infections in patients with advanced AIDS.
- Accurate diagnosis and treatment require a comprehensive approach that accounts for polymicrobial infections in this immunocompromised population.