[Multilevel tuberculous spondylitis]. / Espondilitis tuberculosa multinivel.

A case of a 20-year-old man with multilevel non-contiguous tuberculous spondylitis (cervical, dorsal 6, dorsal 10 and lumbar) is presented. In the context of disseminated tuberculosis in an HIV-negative patient with serious compromise of his general condition and multiple locations of the disease, some of these with fistulas that secreted caseum. The acute paraplegia led, considering the sensory level at dorsal 6, to a first urgent decompression surgery via the posterior approach. A scheduled surgery was then performed, first in the cervical region via the anterior approach, with corpectomy, placement of a vertebral body replacement plus autologous graft and plate with screws. Subsequently, dislocation of dorsal level 6 was evidenced backwards, compressing the spinal cord and, given the mechanical instability, a third surgical stage was indicated by posterior approach, which included reduction, decompression and fixation, resolving the three levels by posterior approach with bars and screws. The surgical, medical and physiotherapy treatment of this rare form of Pott's disease was successful, with recovery of his mechanical stability and progressive recovery of his neurological status. The surgical, medical and physiotherapy treatment of this rare form of Pott's disease was successful, with recovery of his mechanical stability and progressive recovery of his neurological status.

Se presenta el caso de un varón de 20 años con espondilitis tuberculosa multinivel no contigua (cervical, dorsal 6, dorsal 10 y lumbar). Se trata de un paciente HIV negativo con tuberculosis diseminada con grave compromiso de su estado general y múltiples localizaciones de la enfermedad. Algunas tenían fistulas que secretaban caseum. El paciente presentó paraplejía aguda que requirió, teniendo en cuenta el nivel sensitivo a nivel dorsal 6, una primera cirugía urgente de descompresión por vía posterior. Luego se efectuó la cirugía programada. En primera instancia, la región cervical por vía anterior, con corporectomía, colocación de reemplazo de cuerpo vertebral más injerto autólogo y placa con tornillos. Posteriormente se evidenció luxación del nivel dorsal 6 hacia atrás comprimiendo la médula espinal y, dada la inestabilidad mecánica, se indicó un tercer tiempo quirúrgico por vía posterior que comprendió reducción, descompresión y fijación, resolviendo los tres niveles por vía posterior con barras y tornillos. El tratamiento quirúrgico, médico y kinésico de esta forma poco frecuente del mal de Pott fue exitoso, con recuperación de su estabilidad mecánica y progresiva recuperación de su estado neurológico.

Espondilitis tuberculosa multinivel / Multilevel tuberculous spondylitis

Resumen Se presenta el caso de un varón de 20 años con espondilitis tuberculosa multinivel no contigua (cervical, dorsal 6, dorsal 10 y lumbar). Se trata de un paciente HIV negativo con tuberculosis dise minada con grave compromiso de su estado general y múltiples localizaciones de la enfermedad. Algunas tenían fistulas que secretaban caseum. El paciente presentó paraplejía aguda que requirió, teniendo en cuenta el nivel sensitivo a nivel dorsal 6, una primera cirugía urgente de descompresión por vía posterior. Luego se efectuó la cirugía programada. En primera instancia, la región cervical por vía anterior, con corporectomía, colocación de reemplazo de cuerpo vertebral más injerto autólogo y placa con tornillos. Posteriormente se evidenció luxación del nivel dorsal 6 hacia atrás comprimiendo la médula espinal y, dada la inestabilidad mecánica, se indicó un tercer tiempo quirúrgico por vía posterior que comprendió reducción, descompresión y fijación, resolviendo los tres niveles por vía posterior con barras y tornillos. El tratamiento quirúrgico, médico y kinésico de esta forma poco frecuente del mal de Pott fue exitoso, con recuperación de su estabilidad mecánica y progresiva recuperación de su estado neurológico.

Abstract A case of a 20-year-old man with multilevel non-contiguous tuberculous spondylitis (cervical, dorsal 6, dorsal 10 and lumbar) is presented. In the context of disseminated tuberculosis in an HIV-negative patient with serious compromise of his general condition and multiple locations of the disease, some of these with fistulas that secreted caseum. The acute paraplegia led, considering the sensory level at dorsal 6, to a first urgent decompression surgery via the posterior approach. A scheduled surgery was then performed, first in the cervical region via the anterior approach, with corpectomy, placement of a vertebral body replace ment plus autologous graft and plate with screws. Subsequently, dislocation of dorsal level 6 was evidenced backwards, compressing the spinal cord and, given the mechanical instability, a third surgical stage was indi cated by posterior approach, which included reduction, decompression and fixation, resolving the three levels by posterior approach with bars and screws. The surgical, medical and physiotherapy treatment of this rare form of Pott's disease was successful, with recovery of his mechanical stability and progressive recovery of his neurological status. The surgical, medical and physiotherapy treatment of this rare form of Pott's disease was successful, with recovery of his mechanical stability and progressive recovery of his neurological status.

Circulating Monocyte-Like Myeloid Derived Suppressor Cells and CD16 Positive Monocytes Correlate With Immunological Responsiveness of Tuberculosis Patients.

Alterations of myeloid cell populations have been reported in patients with tuberculosis (TB). In this work, we studied the relationship between myeloid-derived suppressor cells (MDSC) and monocytes subsets with the immunological responsiveness of TB patients. Individuals with active TB were classified as low responders (LR-TB) or high responders (HR-TB) according to their T cell responses against a cell lysate of Mycobacterium tuberculosis (Mtb-Ag). Thus, LR-TB, individuals with severe disease, display a weaker immune response to Mtb compare to HR-TB, subjects with strong immunity against the bacteria. We observed that LR-TB presented higher percentages of CD16 positive monocytes as compared to HR-TB and healthy donors. Moreover, monocyte-like (M-MDSC) and polymorphonuclear-like (PMN-MDSC) MDSC were increased in patients and the proportion of M-MDSC inversely correlated with IFN-γ levels released after Mtb-Ag stimulation in HR-TB. We also found that LR-TB displayed the highest percentages of circulating M-MDSC. These results demonstrate that CD16 positive monocytes and M-MDSC frequencies could be used as another immunological classification parameter. Interestingly, in LR-TB, frequencies of CD16 positive monocytes and M-MDSC were restored after only three weeks of anti-TB treatment. Together, our findings show a link between the immunological status of TB patients and the levels of different circulating myeloid cell populations.

PGE2 displays immunosuppressive effects during human active tuberculosis.

Prostaglandin E2 (PGE2), an active lipid compound derived from arachidonic acid, regulates different stages of the immune response of the host during several pathologies such as chronic infections or cancer. In fact, manipulation of PGE2 levels was proposed as an approach for countering the Type I IFN signature of tuberculosis (TB). However, very limited information regarding the PGE2 pathway in patients with active TB is currently available. In the present work, we demonstrated that PGE2 exerts a potent immunosuppressive action during the immune response of the human host against Mycobacterium tuberculosis (Mtb) infection. Actually, we showed that PGE2 significantly reduced the surface expression of several immunological receptors, the lymphoproliferation and the production of proinflammatory cytokines. In addition, PGE2 promoted autophagy in monocytes and neutrophils cultured with Mtb antigens. These results suggest that PGE2 might be attenuating the excessive inflammatory immune response caused by Mtb, emerging as an attractive therapeutic target. Taken together, our findings contribute to the knowledge of the role of PGE2 in the human host resistance to Mtb and highlight the potential of this lipid mediator as a tool to improve anti-TB treatment.

Neutrophil autophagy during human active tuberculosis is modulated by SLAMF1.

Neutrophils infected with Mycobacterium tuberculosis (Mtb) predominate in tuberculosis patients' lungs. Neutrophils phagocytose the pathogen, but the mechanism of pathogen elimination is controversial. Macroautophagy/autophagy, a crucial mechanism for several neutrophil functions, can be modulated by immunological mediators. The costimulatory molecule SLAMF1 can act as a microbial sensor in macrophages being also able to interact with autophagy-related proteins. Here, we demonstrate for the first time that human neutrophils express SLAMF1 upon Mtb-stimulation. Furthermore, SLAMF1 was found colocalizing with LC3B+ vesicles, and activation of SLAMF1 increased neutrophil autophagy induced by Mtb. Finally, tuberculosis patients' neutrophils displayed reduced levels of SLAMF1 and lower levels of autophagy against Mtb as compared to healthy controls. Altogether, these results indicate that SLAMF1 participates in neutrophil autophagy during active tuberculosis.Abbreviations: AFB: acid-fast bacilli; BafA1: bafilomycin A1; CLL: chronic lymphocytic leukemia; DPI: diphenyleneiodonium; EVs: extracellular vesicles; FBS: fetal bovine serum; HD: healthy donors; HR: high responder (tuberculosis patient); IFNG: interferon gamma; IL1B: interleukin 1 beta; IL17A: interleukin 17A; IL8: interleukin 8; LR: low responder (tuberculosis patient); mAb: monoclonal antibody; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MAPK: mitogen-activated protein kinase; MAPK1/ERK2: mitogen-activated protein kinase 1; MAPK14/p38: mitogen-activated protein kinase 14; Mtb: Mycobacterium tuberculosis; Mtb-Ag: Mycobacterium tuberculosis, Strain H37Rv, whole cell lysate; NETs: neutrophils extracellular traps; PPD: purified protein derivative; ROS: reactive oxygen species; PIK3C3/VPS34: phosphatidylinositol 3-kinase catalytic subunit type 3; SLAMF1: signaling lymphocytic activation molecule family member 1; TB: tuberculosis; TLR: toll like receptor.

IFN-γ and IgG responses to Mycobacterium tuberculosis latency antigen Rv2626c differentiate remote from recent tuberculosis infection.

Tuberculin skin test (TST) and IFN-γ release assays are currently used to detect Mycobacterium tuberculosis (Mtb) infection but none of them differentiate active from latent infection (LTBI). Since improved tests to diagnose Mtb infection are required, we studied the immune response to Mtb latency antigen Rv2626c in individuals exposed to the bacteria during different periods. Tuberculosis patients (TB), TB close contacts (CC: subjects exposed to Mtb for less than three months) and healthcare workers (HW: individuals exposed to Mtb at least two years) were recruited and QuantiFERON (QFT) assay, TST and IFN-γ secretion to Rv2626c were analyzed. Twenty-two percent of the individuals assessed had discordant results between QFT and TST tests. Furthermore, QFT negative and QFT positive individuals produced differential levels of IFN-γ against Rv2626c, in direct association with their exposure period to Mtb. Actually, 91% of CC QFT negative subjects secreted low levels of IFN-γ to Rv2626c, whereas 43% of HW QFT negative people produced elevated IFN-γ amounts against Rv2626c. Conversely, 69% of CC QFT positive subjects didn´t produce IFN-γ to Rv2626c. Interestingly, a similar pattern of IgG anti-Rv2626c plasma levels was observed. Therefore, determination of IFN-γ and IgG levels against the dormancy antigen Rv2626c allows to identify established LTBI.

Tuberculosis vulvar: Una rara localización / Vulvar Tuberculosis: A Rare Localization

La tuberculosis vulvar es una rara localización de la enfermedad, que debe incluirse en los diagnósticos diferenciales de lesiones ulcerosas o exofíticas dolorosas a ese nivel. Se presenta el caso de una mujer joven, VIH negativa, con grave compromiso del estado general debido a una tuberculosis diseminada con múltiples localizaciones: pulmonar, renal, genital, intestinal y peritoneal. La cepa de Mycobacterium tuberculosis aislada del esputo, orina y tracto genital fue pansensible y la paciente respondió al tratamiento con drogas de primera línea.

The vulvar tuberculosis is an uncommon localization of tuberculosis, which has to be included in the differential diagnosis of painful vulvar ulcerative or exophytic lesions. This report presents a case of an HIV negative young woman with severe compromise of her health status, due to disseminated tuberculosis with multiple localizations: pulmonary, renal, genital, intestinal and peritoneal manifestations. The strain of Mycobacterium tuberculosis isolated from sputum, urine and the genital tract was susceptible to all the antituberculosis medicaments and the patient responded to treatment with first-line drugs.

Tuberculosis vulvar: Una rara localización

La tuberculosis vulvar es una rara localización de la enfermedad, que debe incluirse en los diagnósticos diferenciales de lesiones ulcerosas o exofíticas dolorosas a ese nivel. Se presenta el caso de una mujer joven, VIH negativa, con grave compromiso del estado general debido a una tuberculosis diseminada con múltiples localizaciones: pulmonar, renal, genital, intestinal y peritoneal. La cepa de Mycobacterium tuberculosis aislada del esputo, orina y tracto genital fue pansensible y la paciente respondió al tratamiento con drogas de primera línea.(AU)

The vulvar tuberculosis is an uncommon localization of tuberculosis, which has to be included in the differential diagnosis of painful vulvar ulcerative or exophytic lesions. This report presents a case of an HIV negative young woman with severe compromise of her health status, due to disseminated tuberculosis with multiple localizations: pulmonary, renal, genital, intestinal and peritoneal manifestations. The strain of Mycobacterium tuberculosis isolated from sputum, urine and the genital tract was susceptible to all the antituberculosis medicaments and the patient responded to treatment with first-line drugs.(AU)

Radiological versus histopathological diagnosis of usual interstitial pneumonia in the clinical practice: does it have any survival difference?

BACKGROUND: Recent studies have shown that quantification of specific histopathologic features found in usual interstitial pneumonia (UIP) are useful in defining a prognosis, suggesting the need of biopsy in all patients. OBJECTIVES: This study examines whether UIP-associated mortality is different in patients diagnosed by high-resolution computed tomography (HRCT) features considered definite of UIP and in patients with no definite radiological diagnosis that required histological confirmation of diagnoses. METHODS: Forty-five patients were included (30 males, mean age 65.3 +/- 10.7 years). Two groups of patients were identified: those with HRCT findings of definite UIP (n = 26) and those whose radiological diagnosis was not definite and required a surgical biopsy to confirm the presence of UIP (n = 19). Forced vital capacity, forced expiratory volume in 1 s and diffusing capacity for carbon monoxide were measured in all patients. All data were obtained from medical records, and the survival status was obtained by telephone or personal interview. All clinical parameters and HRCTs were obtained within 1 month before surgical lung biopsy. RESULTS: Median survival was not different across groups and was similar to that previously reported (35 months). Kaplan-Meier analysis did not show any difference in 5-year survival between both groups. CONCLUSIONS: In a clinical context in which the diagnosis of UIP can be obtained as a dynamic process that includes an integrated clinical, radiological and pathologic approach, a reliable diagnosis of UIP can be obtained based on a typical definite HRCT with no risk of including patients with a more benign disease and a more prolonged survival.

Patterns of pulmonary function in smoking and nonsmoking patients with progressive systemic sclerosis.

Pulmonary involvement is a prominent feature in systemic sclerosis and a significant cause of morbidity and mortality. A restrictive ventilatory defect is typical and static lung volumes are usually reduced in patients with ILDs. The possibility of obstruction of small airways in progressive systemic sclerosis (SSc) has been suggested by widespread bronchiolectasis and peribronchial fibrosis noted at necropsy. A total of 46 patients with a diagnosis of SSc were retrospectively included in this study. Patients were classified according to their smoking status (never smokers, n = 34 and ex or current smokers, n = 12). Patients were also compared on the basis of the presence or not of an obstructive pattern on spirometry. The purpose of this study was to establish if SSc patients who are smokers have a different pattern of pulmonary function involvement. Our hypothesis was that smoking habit was not the only cause of air trapping and that the existence of small airway involvement secondary to SSc itself cannot be excluded.

[Lung involvement in systemic sclerosis]. / Compromiso pulmonar en esclerosis sistémica.

The objective of this study was to determine clinical predictors of interstitial lung disease in patients with systemic sclerosis (SSc) and pulmonary involvement as defined by presence of a decreased diffusing capacity for carbon monoxide (DLCO). Forty subjects with SSc were retrospectively evaluated. Patients were categorized according to their level of DLCO (< o > or = 80% of predicted). Sensitivity of dyspnea to detect a decreased DLCO was 46.6% and specificity 90%, whereas oxygen desaturation showed a sensitivity of 71.4% and a specificity of 80%. Patients with decreased DLCO (n = 18) were not different in age (51.1 +/- 13.5 vs. 53.5 +/- 9.3 y, p = 0.5182), sex (male 13.6%, p = 0.6088), prevalence of Raynaud (86.6% vs. 85%, p = 0.6272), sicca syndrome (6.2% vs. 10.5% p = 1.0000) diffuse cutaneous involvement (94.1% vs. 83.3%, p = 0.6026) or esophageal dilatation. The duration of symptoms since diagnosis was no different. Prevalence of pulmonary hypertension assessed by Doppler echocardiography or abnormal nailfold capillaroscopic findings were identical in both populations. Patients with low DLCO had a significatly higher prevalence of anti topoisomerase antibodies. (5/9 vs. 0/11, p = 0.0081) and restrictive lung disease. Patients with low DLCO showed a significantly higher prevalence of abnormal HRCT findings suggestive of ILD (82.3% vs. 5.8%, p < or = 0.0001). We conclude that a low DLCO is a frequent finding in SSc patients, strongly associated with HRCT signs of ILD. We have not found clinical factors predictive for a low DLCO.

Biopsia en enfermedad intersticial pulmonar / Lung biopsy for the diagnosis of interstitial lung disease

El objetivo del presente estudio fue determinar el rédito diagnóstico y los factores asociados a mayor morbimortalidad en la biopsia quirúrgica de pulmón en pacientes con enfermedad intersticial difusa. Se analizaron en forma retrospectiva los registros clínicos de 71 pacientes. Se registraron complicaciones en 16 pacientes (22.5%). La mortalidad operatoria fue 11.2%. Los pacientes en quienes la biopsia se realizó por videotoracoscopia (n = 52) y por toracotomía (n = 17) tuvieron la misma duración de estadía en terapia intensiva y de estadía hospitalaria. La tasa de complicaciones (22.2% vs. 21.0%, p = 1.0000) y la mortalidad (9.2 vs. 15.7%, p = 0.2738) no fueron diferentes. Ocho pacientes murieron dentro de los 30 días. La prevalencia de inmunosupresión (4/8 vs. 9/63, p = 0.0325) fue significativamente superior en el grupo de pacientes fallecidos. Estos pacientes tuvieron valores preoperatorios más elevados de urea (50 ± 20.1 mg/dl vs. 31.2 ± 10.3 mg/ dl, p = 0.0013) y menores valores de saturación de O2: 82.7 ± 14.8% vs. 92.8 ± 3.4%, p = 0.0009. En los 11 pacientes con iniciación aguda la mortalidad fue significativamente más elevada (36.3% vs. 7.1%, p = 0.0223). La biopsia aportó un diagnóstico específico en 100% de los pacientes y cambió la estrategia terapéutica en 66.7%. En conclusión, la biopsia de pulmón por vía toracoscópica es un procedimiento útil y seguro en los pacientes con enfermedad intersticial difusa del pulmón. Sin embargo, en el grupo de pacientes inmunocomprometidos, con cuadros de presentación aguda y con insuficiencia respiratoria preoperatoria, la mortalidad es elevada y deben balancearse muy críticamente los riesgos contra los beneficios en ese grupo de enfermos.

The objective of this study was to determine the morbidity, mortality and diagnostic yield of video assisted thoracoscopy (VATS) and thoracotomy lung biopsy in interstitial lung disease (ILD). Clinical records of 71 patients were retrospectively analyzed. There was no difference in mean hospital stay, intensive care unit stay and duration of chest tube drainage in patients with VATS (n = 52) compared with those undergoing open thoracotomy (n = 17). Complications rate (22.2% vs. 21.0%, p = 1.0000) and operating mortality (9.2 vs. 15.7%, p = 0.2738) were also similar. Overall, complications occurred in 16 patients (22.5%). Thirty-day mortality rate was 11.2% (n = 8). Prevalence of immunosupression (4/8 vs. 9/63, p = 0.0325) was significantly higher in the group of patients who died. No surviving patients had higher values of plasmatic urea (50 ± 20.1 mg/dl vs. 31.2 ± 10.3 mg/dl, p = 0.0013) or lower values of preoperative oxygen saturation (SaO2): 82.7 ± 14.8% vs. 92.8 ± 3.4%, (p = 0.0009). Eleven patients had an acute illness. Those patients did not show a higher complication rate (4/11 vs. 10/45, p = 0.4390) but mortality was significantly higher (4/11, 36.3% vs. 3/45, 7.1%, p = 0.0223). Biopsy allowed a specific histologic diagnosis in 100% of patients and changed therapy in 66.7%. We conclude that surgical lung biopsy is a safe and useful procedure in patients with ILD. However the higher mortality rate in patients with acute symptoms, immunocompromise, or in respiratory failure must be balanced against potential benefits of altering treatment decisions.

Compromiso pulmonar en esclerosis sistémica / Lung involvement in systemic sclerosis

El objetivo del estudio fue determinar las características clínicas de los pacientes con esclerodermia y compromiso pulmonar y evaluar si existen factores clínicos predictores de mayor riesgo de enfermedad intersticial. Se estudiaron en forma retrospectiva 40 pacientes con esclerodermia. Fueron divididos en 2 grupos: capacidad de difusión del monóxido de carbono (DLCO) normal (n = 22) y DLCO disminuida (n = 18, 45%). Los pacientes con DLCO disminuida no fueron diferentes en edad (51.1 más o menos 13.5 vs. 53.5 más o menos 9.3 años, p = 0.5182), sexo (varones 13.6%, p = 0.6088 ), presencia de Raynaud (86.6% vs. 85%, p = 0.6272), síndrome de ojo seco (6.2% vs. 10.5%, p = 1.0000) prevalencia de enfermedad difusa (94.1% vs. 83.3%, p = 0.6026) o de dilatación esofágica. El tiempo de evolución de la enfermedad no fue diferente. La sensibilidad de la disnea para detectar una DLCO alterada fue 46.6% con una especificidad del 90% y la de la caída de la saturación de O2 (SaO2) del 71.4% y 80% respectivamente. Los pacientes con DLCO baja tuvieron mayor prevalencia de anticuerpos anti-Scl 70 positivos (5/9 vs. 0/11, p = 0.0081) y de incapacidad ventilatoria restrictiva aunque en 56.7% de los pacientes con DLCO disminuida la capacidad pulmonar total (CPT) era normal. La presencia de hipertensión pulmonar medida por ecocardiograma Doppler fue idéntica (11/13 vs. 10/11, p = 1.0000). Los pacientes con DLCO disminuida tuvieron una prevalencia muy superior de tomografía computada de tórax con evidencias de compromiso intersticial (82.3% vs. 5.8%, p menor o igual a 0.0001). En conclusión, nuestros datos sugieren que la disminución de la DLCO es un hallazgo, muy frecuentemente asociado a TAC de tórax con compromiso intersticial y que no hay variables clínicas que permitan predecir su anormalidad.

The objective of this study was to determine clinical predictors of interstitial lung disease in patients with systemic sclerosis (SSc) and pulmonary involvement as defined by presence of a decreased diffusing capacity for carbon monoxide (DLCO). Forty subjects with SSc were retrospectively evaluated. Patients were categorized according to their level of DLCO (less than or more than or equal to 80% of predicted). Sensitivity of dyspnea to detect a decreased DLCO was 46.6% and specificity 90%, whereas oxygen desaturation showed a sensitivity of 71.4% and a specificity of 80%. Patients with decreased DLCO (n = 18) were not different in age (51.1 more or less than 13.5 vs. 53.5 more or less than 9.3 y, p = 0.5182), sex (male 13.6%, p = 0.6088), prevalence of Raynaud (86.6% vs. 85%, p = 0.6272), sicca syndrome (6.2% vs. 10.5% p = 1.0000) diffuse cutaneous involvement (94.1% vs. 83.3%, p = 0.6026) or esophageal dilatation. The duration of symptoms since diagnosis was no different. Prevalence of pulmonary hypertension assessed by Doppler echocardiography or abnormal nailfold capillaroscopic findings were identical in both populations. Patients with low DLCO had a significatly higher prevalence of anti topoisomerase antibodies. (5/9 vs. 0/11, p = 0.0081) and restrictive lung disease. Patients with low DLCO showed a significantly higher prevalence of abnormal HRCT findings suggestive of ILD (82.3% vs. 5.8%, p less than or equal to 0.0001). We conclude that a low DLCO is a frequent finding in SSc patients, strongly associated with HRCT signs of ILD. We have not found clinical factors predictive for a low DLCO.

[Lung biopsy for the diagnosis of interstitial lung disease]. / Biopsia en enfermedad intersticial pulmonar.

The objective of this study was to determine the morbidity, mortality and diagnostic yield of video assisted thoracoscopy (VATS) and thoracotomy lung biopsy in interstitial lung disease (ILD). Clinical records of 71 patients were retrospectively analyzed. There was no difference in mean hospital stay, intensive care unit stay and duration of chest tube drainage in patients with VATS (n = 52) compared with those undergoing open thoracotomy (n = 17). Complications rate (22.2% vs. 21.0%, p = 1.0000) and operating mortality (9.2 vs. 15.7%, p = 0.2738) were also similar. Overall, complications occurred in 16 patients (22.5%). Thirty-day mortality rate was 11.2% (n = 8). Prevalence of immunosupression (4/8 vs. 9/63, p = 0.0325) was significantly higher in the group of patients who died. No surviving patients had higher values of plasmatic urea (50 +/- 20.1 mg/dl vs. 31.2 +/- 10.3 mg/dl, p = 0.0013) or lower values of preoperative oxygen saturation (SaO2): 82.7 +/- 14.8% vs. 92.8 +/- 3.4%, (p = 0.0009). Eleven patients had an acute illness. Those patients did not show a higher complication rate (4/11 vs. 10/45, p = 0.4390) but mortality was significantly higher (4/11, 36.3% vs. 3/45, 7.1%, p = 0.0223). Biopsy allowed a specific histologic diagnosis in 100% of patients and changed therapy in 66.7%. We conclude that surgical lung biopsy is a safe and useful procedure in patients with ILD. However the higher mortality rate in patients with acute symptoms, immunocompromise, or in respiratory failure must be balanced against potential benefits of altering treatment decisions.