Clinically unrecognized miliary tuberculosis: an autopsy study
2016; King Faisal Specialist Hospital and Research Centre; Volume: 36; Issue: 1 Linguagem: Inglês
10.5144/0256-4947.2016.42
ISSN0975-4466
AutoresIvana Savić, Vesna Škodrić-Trifunović, Dragan Mitrović,
Tópico(s)Orthopedic Infections and Treatments
Resumooriginal articleClinically unrecognized miliary tuberculosis: an autopsy study Ivana Savic, Vesna Trifunovic-Skodric, and Dragan Mitrovic Ivana Savic Institute of Pathology, Faculty of Medicine, University of Belgrade, Dr Subotica 1 Belgrade, Serbia , Vesna Trifunovic-Skodric Clinic of Pulmonology, Faculty of Medicine, University of Belgrade, Clinical Centre of Serbia, Belgrade, Serbia , and Dragan Mitrovic Institute of Pathology, Faculty of Medicine, University of Belgrade, Dr Subotica 1 Belgrade, Serbia Published Online::4 Feb 2016https://doi.org/10.5144/0256-4947.2016.42SectionsPDF ToolsAdd to favoritesDownload citationTrack citations ShareShare onFacebookTwitterLinked InRedditEmail AboutAbstractBACKGROUND: Miliary tuberculosis (TB) usually presents with atypical clinical manifestations; thus it is often recognized only at autopsy.OBJECTIVES: Our objectives were to study the frequency of MT diagnosed at autopsy and determine clinical diagnoses that masked TB, as well as causes of death and comorbidities.DESIGN: Retrospective study of all autopsies performed between 2008 and 2014.SETTING: Institute of Pathology, Belgrade, Serbia.SUBJECTS AND METHODS: In subjects where autopsy showed the presence of MT that was not recognized clinically, we recorded the clinical diagnoses (presumed causes of death) as reported in autopsy request forms, as well as actual cause of death and comorbidities as determined at autopsy.MAIN OUTCOME MEASURES: Clinically unrecognized MT.RESULTS: The total number of autopsies in this period was 6206. Thirty-five individuals showed clinically unrecognized MT (0.56% of all autopsies, age: 62.2 [17.2] years, M:F=2:3). Common clinical diagnoses masking pulmonary MT were exacerbation of COPD (25%) and pulmonary thromboembolism (25%), with common radiological presentation of diffuse pulmonary infiltrates (56.3%). Dominant clinical diagnoses in patients with generalized MT were adult respiratory distress syndrome, sepsis, gastrointestinal bleeding and meningoencephalitis. Disseminated MT was often associated with secondary anemia or thrombocytopenia (15.8%) and recent surgery (15.8%). Frequent comorbidities included chronic renal failure and malignancies, whereas MT was a dominant cause of death.CONCLUSION: Greater awareness of MT is needed to improve recognition in clinical settings. In particular, MT should be considered in patients with atypical clinical presentation and diffuse pulmonary infiltrates on chest X-ray, particularly if they have chronic renal failure, malignancy, hematological disorders or a history of recent surgery.LIMITATIONS: None.IntroductionTuberculosis (TB) is a chronic infectious disease that represents an important cause of death in undeveloped and developing countries. According to the latest WHO data, 9 million people acquired TB and 1.5 million died in 2013 worldwide.1 Countries with immigrants and workers from TB endemic countries face an increasing TB burden even though the incidence may have been decreasing.2 For instance, in the period between 1991 and 2010 in Saudi Arabia, the annual TB rate was in the range 8.6–12.2 per 100 000 persons for the original Saudi population, while non-Saudis had 2 to 3 times higher incidence.2 The incidence of TB in Serbia has been declining since 1990 and current data of the national Institute of Public Health in Belgrade report the actual incidence rate for TB to be 15.61 per 100 000 persons.3 Efforts are underway to control the disease, but new strategies are necessary to eliminate it at a global level.4TB is caused by the human type of Mycobacterium tuberculosis, which is usually transmitted via inhalation of infective droplets. Reservoirs of infection are usually people with the active pulmonary form of TB. Classification of TB is based on characteristics of its development and course, and encompassing primary, postprimary or secondary, and miliary TB. Miliary TB is a complication occurring either during primary or postprimary TB when M tuberculosis gets into the bloodstream and is disseminated within the lungs or other organs.5Even in 1700, John Jacob Manget described disseminated TB as numerous small nodules in lung parenchyma, and termed it "miliary tuberculosis" (lat. "millet", grain of millet) and suggested it was a fatal form of the disease.6 Although the incidence of TB is declining, miliary TB still displays a notable and stable incidence. If not recognized and treated in time, miliary TB is potentially lethal.5 Unfortunately, diagnosis of miliary TB can be complicated even for the most experienced clinicians. Given that it has an atypical clinical presentation and can resemble many other diseases, diagnosis of miliary TB is often made at autopsy. Miliary TB can manifest acutely as multiorgan dysfunction,7 septic shock syndrome8 or as adult respiratory distress syndrome.9,10 Patients with more chronic form of disease can show a delay in growth and development,11 fever of unknown origin12 or dysfunction of one or more organs.13 Predisposing factors and conditions associated with development of miliary TB are malnutrition, HIV infection, diabetes mellitus, chronic renal failure, dialysis, organ transplantation, malignant tumors, and silicosis.5 However, the pathogenetic mechanism is not clear.Given the great importance of clinically unrecognized forms of TB both in specialized lung hospitals and in general hospitals,14 the aim of this study was to analyze autopsy cases of clinically unrecognized cases of miliary TB, to determine the clinical diagnoses that most frequently mask the TB, as well as comorbidities that contibute to development and a lethal outcome.SUBJECTS AND METHODSThis was a retrospective study of all autopsy protocols and reports conducted at the Institute of Pathology, Faculty of Medicine, University of Belgrade in a 7-year period (January 1st 2008-December 31st 2014).Autopsy request forms (the forms that had been sent to the Institute of Pathology by the clinicians to require autopsy of the deceased patient) were analyzed. From these forms, we recorded patient sex and age, and the main clinical diagnoses, i.e., presumed causes of death of each individual as reported by the responsible clinicians. In addition, we noted the type of hospital (general hospitals vs. specialized pulmonary hospitals) from which the deceased were sent to the Institute of Pathology for autopsy.Based on the information from autopsy request forms as well as autopsy findings, the study group was composed of autopsied individuals with no mention of clinical diagnosis of TB or antemortem suspicion of TB, but in whom the miliary TB was ascertained at autopsy. These individuals were referred to as "clinically unrecognized TB". They were classified based on autopsy diagnosis to those with miliary pulmonary TB and those with miliary generalized (disseminated) TB. In the individuals with miliary generalized form of TB, we recorded the distribution of TB granulomas throughout the body. TB granulomas were recognized as small whitish nodular formations with typical histological features of agglomeration of epitheloid cells, giant cells of Langhans type and lymphocytes, with centrally located caseous necrosis (Figure 1). Based on autopsy findings, the actual causes of death were noted, as well as main comorbidities.Figure 1 a) Histopathological findings of tuberculous granuloma in lung parenchyma (H&E staining, ×40) (Asterisk denotes the area of caseous necrosis, and the black arrow points to a giant cell of Langhans); b) Histopathological findings of numerous tuberculous granulomas in bone marrow of the autopsied individual with clinical diagnosis of thrombocytopenia and rectorrhage (H&E staining, ×100)."Download FigureStatistical analysis was performed with the software package SPSS v.15.0 (SPSS Inc. Chicago, IL). Differences were considered significant if the P value was less than .05. Chi square or the t test were applied for comparisons.RESULTSThe number of autopsies in the reported 7-year-period was 6206, of which 35 (0.56%) were of individuals with clinically unrecognized miliary TB. Of these, 16 autopsied individuals (45.7%) had miliary pulmonary TB, while 19 individuals (54.3%) had miliary disseminated TB. Mean age of the individuals expressing miliary TB was 62.2 (17.2) years. Females predominated (n=21, 60%) over males (n=14, 40%). Mean age (standard deviation) was 56.5 (16.8) years in men and 66.1 (16.9) in women (P=.11). Fewer autopsied persons with clinically unrecognized miliary TB were sent from specialized pulmonary clinics (n=12, 34.29%) in comparison with deceased patients (n=23, 65.71%) sent from general hospitals (P=.06). The mean age of individuals with unrecognized miliary TB who died in specialized pulmonary clinics was 66.2 (4.1) years, while the mean age of those who died in general hospitals was 60.6 (3.9) (P=.46).Correlation of autopsy findings with the data from autopsy request forms filled out by clinicians revealed a number of diseases for which TB was mistaken (i.e., diagnoses that "masked" the actual TB). Most common clinical diagnoses that had been reported in the autopsy request forms for the individuals in whom miliary pulmonary TB was discovered in autopsy material were chronic obstructive pulmonary disease in exacerbation (25%) and pulmonary thromboembolism (25%) (Table 1a, b, c).Table 1a Clinical diagnoses (presumed causes of death) as reported in autopsy request forms, in individuals where autopsy showed miliary pulmonary tuberculosis: sex distribution.Clinical diagnosesNPercentage (%)MaleFemaleTotalChronic obstructive pulmonary disease in exacerbation13425Pulmonary thromboembolism13425Pleural effusion30318.75Bronchopneumonia02212.5Pulmonary edema02212.5Status febrilis0116.25Total51116100Table 1b Clinical diagnoses (presumed causes of death) as reported in autopsy request forms, in the individuals where autopsy showed miliary pulmonary tuberculosis: age distribution.Clinical diagnosesAge (years)Total<4040–5960–79≥80Chronic obstructive pulmonary disease in exacerbation00224Pulmonary thromboembolism01304Pleural effusion00213Bronchopneumonia00112Pulmonary edema01012Status febrilis00011Table 1c Clinical diagnoses (presumed causes of death) as reported in autopsy request forms, in the individuals where autopsy showed miliary pulmonary tuberculosis: distribution by year.Clinical diagnosesYearTotal2008200920102011201220132014Chronic obstructive pulmonary disease in exacerbation01012004Pulmonary thromboembolism01011104Pleural effusion01011003Bronchopneumonia00002002Pulmonary edema00200002Status febrilis00100001Most frequent clinical diagnoses reported in the autopsy request forms for the individuals with miliary disseminated TB revealed on autopsy were sepsis (10.52%), adult respiratory distress syndrome (ARDS) (10.52%), gastrointestinal bleeding (10.52%) and meningoencephalitis (10.52%) (Table 2a, b, c).Table 2a Clinical diagnoses (presumed causes of death) as reported in autopsy request forms, in the individuals where autopsy showed miliary disseminated tuberculosis: sex distribution.Clinical diagnosesNPercentage (%)MaleFemaleTotalSepsis11210.52ARDS11210.52Gastrointestinal bleeding11210.52Meningoencephalitis11210.52Suspected metastatic deposits in lung parenchyma1015.26Suspected metastatic deposits in liver0115.26Bronchial hemorrhage with suffocation0115.26Status febrilis0115.26Crohn's disease0115.26Ileus0115.26Syndroma Moszkowicz0115.26Hydrocephalus1015.26Respiratory failure21315.84Total81119100Table 2b Clinical diagnoses (presumed causes of death) as reported in autopsy request forms, in the individuals where autopsy showed miliary disseminated tuberculosis: age distributionClinical diagnosesAge (years)Total<4040–5960–79≥80Sepsis01102ARDS11002Gastrointestinal bleeding00112Meningoencephalitis01102Suspected metastatic deposits in lung parenchyma00101Suspected metastatic deposits in liver00101Bronchial hemorrhage with suffocation00101Status febrilis00101Crohn's disease01001Ileus00101Syndroma Moszkowicz10001Hydrocephalus10001Respiratory failure00303Table 2c Clinical diagnoses (presumed causes of death) as reported in autopsy request forms, in the individuals where autopsy showed miliary disseminated tuberculosis: distribution by year.Clinical diagnosesYearTotal2008200920102011201220132014Sepsis00020002ARDS00020002Gastrointestinal bleeding00100102Meningoencephalitis00101002Suspected metastatic deposits in lung parenchyma10000001Suspected metastatic deposits in liver00001001Bronchial hemorrhage with suffocation00001001Status febrilis00010001Crohn's disease00010001Ileus00100001Syndroma Moszkowicz01000001Hydrocephalus00000101Respiratory failure00011103Based on the information from autopsy request forms, chest X-ray showed diffuse pulmonary infiltrates in 56.3% of individuals with miliary pulmonary TB and 21.1% of those with miliary disseminated TB. Hematological abnormalities (secondary anemia, thrombocytopenia) dominated in three cases of miliary disseminated TB (15.8%). Moreover, three patients (15.8%) with postmortem diagnosed miliary disseminated TB had been subjected to recent surgery for kidney transplantation, hysterectomy with adnexectomy, and intestinal subocclusion.Table 3 shows actual causes of death in all individuals with clinically unrecognized miliary TB according to sex, age and year of the study (Table 3a, b, c). The autopsied individuals with miliary TB mostly died of miliary pulmonary TB (n=9, 25.7%), miliary disseminated TB (n=8, 22.9%), acute myocardial infarction (n=4, 11.4%) and bronchopneumonia (n=4, 11.4%) (Table 3a, b, c). When separately analyzing the individuals with miliary pulmonary TB, it was obvious that they mostly died of miliary pulmonary TB (n=9, 56.25%), followed by myocardial infarction (n=4, 25%), pseudomembranous colitis (n=2, 12.5%) and pulmonary thromboembolism (n=1, 6.25%). The autopsied individuals with pathological findings of miliary disseminated TB mostly died of miliary TB (n=8, 42.11%), followed by bronchopneumonia (n=4, 21.05%), ARDS (n=3, 15.79%), tuberculous meningoencephalitis (n=3, 15.79%) and pulmonary thromboembolism (n=1, 5.26%).Table 3a Causes of death as determined during autopsy: sex distribution.Causes of deathNPercentage (%)MalesFemalesTotalMiliary pulmonary tuberculosis45925.7Miliary disseminated tuberculosis17822.9Adult respiratory distress syndrome (ARDS)2138.6Bronchopneumonia22411.4Pseudomembranous colitis1125.7Tuberculous meningoencephalitis3038.6Acute myocardial infarction13411.4Pulmonary thromboembolism0225.7Total142135100Table 3b Causes of death as determined during autopsy: age distribution.Cause of deathAge (years)Total<4040–5960–79≥80Miliary pulmonary tuberculosis03339Miliary disseminated tuberculosis01618Adult respiratory distress syndrome (ARDS)10203Bronchopneumonia21014Pseudomembranous colitis00202Tuberculous meningoencephalitis11103Acute myocardial infarction11114Pulmonary thromboembolism00112Table 3c Causes of death as determined during autopsy: distribution by year.Causes of deathYearTotal2008200920102011201220132014Miliary pulmonary tuberculosis12212109Miliary disseminated tuberculosis00232108Adult respiratory distress syndrome10010103Bronchopneumonia01011104Pseudomembranous colitis00002002Tuberculous meningoencephalitis00110103Acute myocardial infarction12000104Pulmonary thromboembolism00110002Extrapulmonary granulomas in miliary disseminated TB were most commonly found in the liver (68.4%), the spleen (63.2%) and kidneys (42.1%) (Table 4a, b, c; Figure 1b). In all cases of miliary pulmonary and miliary disseminated TB, the lungs were affected by disseminated granulomas. The most frequent comorbidities in patients with miliary pulmonary TB and miliary disseminated TB were hypertensive heart disease (17.1%), chronic renal failure (11.4%), malignancies (11.4%), diabetes mellitus type 2 (8.6%), alcoholism (2.9%) and liver cirrhosis (2.9%).Table 4a Distribution of TB granulomas in patients with disseminated miliary TB, according to sex.OrganNPercentage* (%)MalesFemalesTotalLungs81119100Liver491368.42Spleen481263.15Kidney44842.10Adrenal glands22421.05Bone marrow22421.05Brain30315.78Small and large intestines13421.05Prostate1015.26Urinary bladder0115.26Ovary0115.26Fallopian tube0115.26Uterus0115.26*Percentage of individuals showing TB granuloma in a particular organ.Table 4b Distribution of TB granulomas in patients with miliary disseminated TB, according to age.OrganAge (years)Total<4040–5960–79≥80Lungs4310219Liver327113Spleen137112Kidney12508Adrenal glands11204Bone marrow00404Brain11103Small and large intestines21014Prostate00101Urinary bladder00101Ovary10001Fallopian tube10001Uterus10001DISCUSSIONIn this 7-year study, 0.56% of all autopsies revealed signs of miliary TB that were not recognized clinically. Different autopsy studies have reported that miliary TB has accounted for from 0.3% to 13.3% of all autopsies, while miliary TB represented 11.9% to 40.5% of all cases with TB.15 We found a female predominance in clinically unrecognized TB, which is in agreement with Vasankari et al.16 A mean age above 60 years corresponds to the findings from the study of clinically unrecognized miliary TB by Rosenthal et al.17 Immunocompromised and older patients are most commonly affected.18Our findings revealed that the most common clinical diagnoses for which miliary pulmonary TB was mistaken were exacerbation of chronic obstructive pulmonary disease and pulmonary thromboembolism, whereas miliary generalized TB clinically presented mostly as sepsis, ARDS, gastrointestinal bleeding and meningoencephalitis. They also showed hematological disturbances and were associated with different postoperative conditions. Both types of miliary TB on chest radiographs most frequently showed diffuse bilateral infiltrates of unclear etiology.Miliary TB usually has an atypical clinical presentation, which poses a significant diagnostic challenge even for experienced clinicians. Indeed, our study demonstrated that even in specialized pulmonary hospitals miliary TB may be unrecognized; still, there was a notably higher proportion of clinically unrecognized TB in general hospitals. This finding may be due to the common belief that TB incidence is drastically declining, so clinicians do not consider it in the differential diagnosis. In particular, miliary TB is usually overlooked in countries with a low incidence of TB,19 and a lack of experience with this disease may be the reason for inadequate diagnosis.20 Moreover, miliary TB may remain undiagnosed as the symptoms may be masked with previously administrated antibiotics,21 or due to atypical X-ray findings22 and an increased prevalence of extrapulmonary TB.23 However, clinicians should pay more attention to this condition, considering that individuals with unrecognized TB pose a serious risk for other patients, physicians and pathologists.This study showed the liver as the most common site of TB dissemination following the lungs in the case of miliary generalized TB. According to published data, clinical presentation of disseminated TB in the liver may be accompanied by jaundice and fever, while disseminated intravascular coagulation and multiorgan dysfunction syndrome lead to a lethal outcome in these patients.24 The spleen was the second most frequent localization of TB granulomas in our study, although published data suggests they are quite rare, especially in immunocompetent persons. They can be associated with hematological disturbances,25 as shown in our study.TB of the kidneys and urinary tract is easily overlooked given that symptoms may resemble bacterial cystitis; however, if the usual antibiotics do not help, miliary disseminated TB should be considered. High temperature, lumbar pain, hematuria and chest X-ray findings are not specific enough,26 but could suggest TB.Patients who suffer from TB often have comorbidities. For instance, patients with chronic renal failure have a 10 to 15 times higher risk of TB, predominantly due to deficiencies in the cellular immune system.27 These patients rarely show fever, while laboratory findings indicate uremia with lymphopenia.27 Uremia may be the cause of delayed hypersensitivity, decreased proliferation of Th cells and reduced phagocytic capacity of macrophages. Extrapulmonary TB is about 50% more frequent in the dialysis patients compared to general population.27Bukhary et al previously showed that diabetes mellitus type 2 is a risk factor of TB development. Namely, patients with diabetes mellitus and TB had significantly more bacteria in sputum, positive bacterial cultures even after administration of adequate therapy, as well as more frequent resistance to anti-TB antibiotics.28Resemblance in clinical and radiological presentation of TB and malignant tumors may lead to frequent erroneous diagnosis of these conditions. However, TB and malignancies can even coexist, as it was shown in our study. TB may be associated with an increased risk of various cancers, due to chronic inflammation and possible common risk factors, including immunosuppression and smoking.29In conclusion, miliary TB has an atypical clinical presentation. In the case of etiologically unclear diffuse pulmonary infiltrates on chest X-ray, particularly if the patients have chronic renal failure, malignancy, hematological abnormalities (anemia, thrombocytopenia) or a history of recent surgical intervention, miliary TB should be considered. Better understanding of clinical presentation of miliary TB as well as common misdiagnoses in clinical contexts is essential for improving disease control and elimination of TB in countries facing an increased TB burden due to migrations, as well as for disease control at a global level.ARTICLE REFERENCES:1. World Health Organization. Global tuberculosis report 2014. 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