Routine flow cytometry approach for the evaluation of solid tumor neoplasms and immune cells in minimally invasive samples.

BACKGROUND: Multidimensional flow cytometry (MFC) is routinely used for the diagnosis and follow-up of hematolymphoid neoplasms but its contribution to the identification of non-hematolymphoid malignant tumors is limited. METHODS: The presence of non-hematolymphoid cells in clinical samples obtained via minimally invasive methods was ascertained by using a panel of monoclonal antibodies previously developed in our laboratory comprising a mixture of antibodies: CD9-PacB/CD45-OC515/CD57-FITC/CD56-PE/CD3-PerCP-Cy5.5/CD117-PE-Cy7/CD326-APC/CD81-APC-C750. Histopathological studies were performed using standard techniques. RESULTS: 164 specimens of different origins were included. Malignancy was finally confirmed in 142 (86.5%), while 22 non neoplastic samples were identified. The most frequent diagnosis was small cell lung carcinoma (SCLC) (50%). High sensitivity (S = 98.6%) was reached combining MFC and conventional pathology. Individual markers differed according to the cellular origin of the neoplasm, with neuroendocrine tumors showing a unique immunophenotypic profile (CD56+ CD326+ CD117-/+ and variable tetraspanins expression). Principal component analysis efficiently distinguished SCLC from other tumor samples. In immune cell populations, differences between reactive and malignant biopsies were found in different cell compartments, especially in B cells and Plasma cells. Differences also emerged in the percentage of CD4+ CD8- T cells, CD4-CD8+ T cells and NK cells and these were dependent on the origin of the tumor cells. CONCLUSIONS: These results support the use of MFC as a rapid and valuable technique to detect non-hematolymphoid tumoral cells in clinical specimens, providing an initial orientation to complement hystopathological studies and allow a more precise diagnosis, especially in neuroendocrine neoplasms. The impact of different immune cell patterns warrants further research.

Estenosis membranosa endobronquial web-like: una complicación infrecuente en la granulomatosis con poliangeitis / Web-like Endobronchial Membranous Stenosis: A Rare Complication in Granulomatosis with Polyangiitis

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Community-Acquired Moraxella catarrhalis Bacteremic Pneumonia: Two Case Reports and Review of the Literature.

Moraxella (formerly Branhamella) catarrhalis was discovered at the end of the nineteenth century, and for many decades it was considered to be a harmless commensal of the upper respiratory tract. It is a Gram-negative, aerobic diplococcus considered to be the third most common pathogen isolated in childhood sinusitis and otitis media and in adult chronic lower respiratory disease, as well as an etiological agent of pneumonia in immunosuppressed patients or those with chronic obstructive pulmonary disease. Moraxella catarrhalis pneumonia is rarely associated with bacteremia. Here, we present two cases of community-acquired Moraxella catarrhalis bacteremic pneumonia.

Community-Acquired Pneumonia and Empyema Caused by Citrobacter koseri in an Immunocompetent Patient.

Citrobacter species, belonging to the family Enterobacteriaceae, are environmental organisms commonly found in soil, water, and the intestinal tracts of animals and humans. Citrobacter koseri is known to be an uncommon but serious cause of both sporadic and epidemic septicemia and meningitis in neonates and young infants. Most cases reported have occurred in immunocompromised hosts. The infections caused by Citrobacter are difficult to treat with usual broad spectrum antibiotics owing to rapid generation of mutants and have been associated with high death rates in the past. We believe this is the first case described in the literature of a community-acquired pneumonia and empyema caused by Citrobacter koseri in an immunocompetent adult patient.

Community-acquired bacteremic Streptomyces atratus pneumonia in animmunocompetent adult: a case report.

INTRODUCTION: Streptomyces spp. are aerobic, Gram-positive bacteria of the order Actinomycetales, known for their ability to produce antimicrobial molecules such as streptomycin. Pneumonia due to Streptomyces is considered to be rare and limited to immunocompromised patients. Streptomyces spp. are only rarely associated with invasive systemic infections. To our knowledge, we report the first documented case of community-acquired Streptomyces atratus bacteremic pneumonia in an immunocompetent patient. CASE PRESENTATION: We describe a case of Streptomyces atratus bacteremic pneumonia in an otherwise healthy, 77-year-old Spanish man. Streptomyces identified by 16S ribosomal RNA sequencing grew in multiple blood cultures and bronchoalveolar lavage cultures. The infection resolved completely after treatment with imipenem and amoxicillin/clavulanic acid for 2 months. CONCLUSIONS: The majority of cases reported in the literature make reference to the difficulty of determining the pathogenic role of Streptomyces spp. Usually considered a contaminant, the pathogenic role of Streptomyces spp. is easier to confirm when the species is isolated from a catheter tip and, in the case of blood cultures, in more than one sample with a high count of colonies. To our knowledge, we report the first documented case of Streptomyces atratus bacteremic pneumonia in an immunocompetent patient. As the experience is limited, further studies are needed to better understand the interpretation of the isolates of the genus Streptomyces; the predisposing factors for infection; and the course, treatment, and evolution of these infections.

Amiloidosis traqueobronquial: diagnóstico, tratamiento y evolución en 5 casos / Tracheobronchial amyloidosis: Diagnosis, treatment and evolution in 5 patients

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Air embolism: a complication of computed tomography-guided transthoracic needle biopsy.

Air embolism is a pathological condition caused by the entry of gas into vascular structures. It is a rare but feared complication due to its serious morbidity. We report two male patients who were diagnosed with air embolism as a complication of computed tomography-guided transthoracic needle biopsy. Both patients referred respiratory symptoms minutes after the procedure. The chest computed tomography of one of the patients showed air in the left ventricle and ascending aorta, and in the other, air was noted only in the left ventricle. Both patients suffered myocardial infarction without associated mortality. One patient showed anthracotic dust deposits in the lung biopsy suggestive of pneumoconiosis, and there was no definitive diagnosis in the other. We strongly believe that because of the very low incidence but high mortality of this entity, all physicians should be aware of this complication in order to know how to proceed in this situation.

From cytology to histology: diagnosis of a relapsed mediastinal lymphoma by endobronchial ultrasound transbronchial histological needle.

Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is highly accurate in diagnosing mediastinal lymphadenopathies of lung cancer and benign disorders, with the advantage that it is a minimally invasive technique, unlike open surgery and mediastinoscopy. However, the diagnostic accuracy of EBUS-TBNA for the diagnosis of lymphoma in patients with mediastinal lymphadenopathy is not well defined. The lack of tissue architecture obtained by cytological needles decreases the diagnostic accuracy for diagnosis and subtyping of de novo and relapsed mediastinal lymphomas. We present the first described case in the literature of an anaplastic large cell lymphoma relapsed, diagnosed on tissue fragments obtained by EBUS-TBNA with the particularity of using a histological needle.

Desmoplastic small round cell tumor of the lung: A case report and literature review.

Desmoplastic small round cell tumor (DSRCT) is a rare, aggressive and malignant tumor that is characterized by nests of small tumor cells surrounded by a cellular and vascular collagenous stroma and predominantly affects young adolescent males. This tumor most commonly originates in the abdomen; however, in rare cases, DSRCT can originate in other body regions. The main manifestations of DSRCT are chest pain and respiratory symptoms, and patients' average survival after diagnosis is less than two years. In this report, we describe a case involving DSRCT of the lung that proved to be difficult to diagnose, and we conduct a literature review.