Clinical features and treatment outcomes of pulmonary actinomycosis.

OBJECTIVE: Pulmonary actinomycosis is a rare and chronic infectious disease that mimics malignancy and is frequently misdiagnosed. There are few reports that address the clinical characteristics of pulmonary actinomycosis. The objective of this research is to evaluate the clinical features, radiological findings, diagnostic approaches and treatment outcomes of pulmonary actinomycosis. PATIENTS AND METHODS: Thirty-seven patients with pulmonary actinomycosis histopathologically diagnosed from 2009 to 2021 were analyzed retrospectively. RESULTS: The mean age at presentation was 53.7 (±13.3) years. Frequent symptoms were cough and hemoptysis. The median diagnosis time from the first symptoms was 60 days (interquartile range 18-195). Pulmonary comorbidity was found in 59.5% of cases. The most common thorax computed tomography finding was mass or nodule. The low-attenuation center within the mass or consolidation was observed in 40% of the lesions. The median maximal standardized uptake value of lesions on positron emission tomography (PET) was 6.5 (interquartile range 2.7-10.3). In the majority of cases (97.3%), the diagnosis of pulmonary actinomycosis was not suspected at admission, and 56.8% of patients were misdiagnosed with lung cancer. The mean duration of antibiotic therapy was 9.4 days (range 3-22) with intravenous antibiotics and 64.7 days (range 5-270) with oral antibiotics. Four patients died due to concomitant comorbidities. Eight cases were lost to follow-up. All other cases were fully cured. CONCLUSIONS: Pulmonary actinomycosis mimics other diseases, often lung cancer. Clinicians should consider the diagnosis of actinomycosis when they detect a mass or consolidation, especially with a low-attenuation center. PET/CT appears not to be useful for differential diagnosis. A shorter course of antibiotic therapy than traditionally recommended appears to be sufficient.

Detection of Mycobacterium tuberculosis DNA from peripheral blood in patients with HIV-seronegative and new cases of smear-positive pulmonary tuberculosis by polymerase chain reaction.

Tuberculosis is still one of the most important cause of mortality and morbidity in many countries and there is a need for new methods for accurate and rapid diagnosis of tuberculosis. To determine the sensitivity and specificity of polymerase chain reaction (PCR) method, we have evaluated Mycobacterium tuberculosis DNA in peripheral blood samples with PCR technique in adult patients with human immunodeficiency virus (HIV)-negative and new cases of smear-positive pulmonary tuberculosis. We investigated the relationship between characteristic of the patients, radiological extension of the disease, sputum smear grade, presence of cavity, body-mass index (BMI) serum albumin level, total delay time and PCR positivity. Forty patients (33 male and 7 female; mean age 37.8 +/- 14.1) and 20 healthy control subjects (13 male and 7 female; mean age 35.6 +/- 7.3) were enrolled in this study. PCR was positive in 16 of 40 (40%) patients with pulmonary tuberculosis and negative in 24 of 40 (60%). None of the healthy controls had positive PCR results. The overall sensitivity specificity and accuracy of the PCR assay was 40, 100 and 60%, respectively. We found the positive correlation between PCR positivity and sputum smear grade (r=0.46, P=0.003) radiological extension of the disease (r=0.69, P=0.001), presence of cavity (r=0.90, P=0.001). We conclude that the detection of M. tuberculosis DNA from peripheral blood by PCR technique is useful for the rapid diagnosis of tuberculosis patients with HIV-negative. Hematogenous dissemination was important in tuberculosis patients and peripheral blood samples were suitable and easy materials. However, standardization of the PCR method must be ensured for the diagnosis of tuberculosis.