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PubMed2000

Development of a polymerase chain reaction dot-blotting system for detecting cutaneous tuberculosis.

For a definitive diagnosis of cutaneous tuberculosis the demonstration of mycobacteria is essential, but this is generally not possible in skin lesions. Routinely available techniques have poor sensitivity and are time consuming, therefore, delaying the institution of timely therapy. The high sensitivity and speed of polymerase chain reaction (PCR) for the detection of infectious agents has prompted investigators to use this technique for the detection of Mycobacterium tuberculosis in body fluids such as cerebrospinal fluid or pleural fluid. In the present study, PCR was used to examine punch biopsy specimens from the affected skin of 10 patients with clinical diagnoses of tuberculosis verrucosa cutis, lupus vulgaris, scrofuloderma, papulonecrotic tuberculide and erythema induratum. A control group of 20 patients included individuals having skin manifestations with definite clinical diagnoses other than cutaneous tuberculosis, such as leprosy, fungal mycetoma, chronic bullous disease of childhood and pemphigus vulgaris. The PCR amplified products were dot hybridized with a probe which was random prime labelled with 32P. The results were compared with routine microbiological and histological findings. Among the test group, six of 10 (60%) were positive for M. tuberculosis by PCR, although their histopathology showed non-specific chronic inflammation with no definite diagnosis. Microbiological investigations, including acid-fast bacillus smear and culture, were positive in a single case of scrofuloderma. All patients in the control group were negative by PCR for M. tuberculosis. The data indicate that the combination of dot hybridization with PCR markedly increased the sensitivity and specificity of PCR. This may be a useful tool in the diagnosis of tuberculosis when conventional methods fail.

Humans↗
PubMed2000

Facial cutaneous tuberculosis: an unusual presentation.

Periocular cutaneous tuberculosis is a rare occurrence. We describe a 75-year-old Caucasian woman with tuberculosis of the left periocular region which responded completely to standard antituberculosis therapy. We hypothesize this unusual presentation may be due to minor trauma followed by inoculation.

Aged↗
PubMed1995

Cutaneous tuberculosis in Hong Kong: a 10-year retrospective study.

BACKGROUND: Cutaneous tuberculosis was once a relatively common skin disease in Hong Kong. Tuberculosis verrucosa cutis was the commonest type. Because the last survey was carried out 25 years ago, it was thought necessary to find out the new incidence and pattern of this important disease in this locality. METHODS: A 10-year (1983-1992) retrospective survey on the epidemiologic and clinicobacteriologic aspects of cutaneous tuberculosis had been done in the public sector of Hong Kong. The records of the confirmed cases were retrieved for statistical analysis. RESULTS: A total of 176 cases are included in the final analysis. This represents 0.066% of all new skin cases seen during the 10-year period. Among these, 79.5% are erythema induratum, 6.3% lupus vulgaris, and 4.5% tuberculosis verrucosa cutis. They are further divided into true cutaneous tuberculosis (14.8%, n = 26) and the tuberculide (85.2%, n = 150). Among the patients with true tuberculosis, 42.3% had lupus vulgaris, 30.8% had tuberculosis verrucosa cutis, and 26.9% had scrofuloderma. Among the tuberculides, erythema induratum accounted for 93.3%. CONCLUSIONS: Cutaneous tuberculosis is now uncommon in Hong Kong. Tuberculosis verrucosa cutis is no longer the commonest type in Hong Kong as described in some textbooks. Erythema induratum is now the most common among the total cases and lupus vulgaris is the most common among the true cutaneous forms of tuberculosis.

Adolescent↗
PubMed2003

[Cutaneous tuberculosis: anatomoclinical features and clinical course (26 cases)].

INTRODUCTION: Despite prevention programs, tuberculosis is still progressing endemically in developing countries. The prevalence of cutaneous tuberculosis is estimated as 2.1 p. 100 and represents a rare localization among the extra-pulmonary forms. In order to study the epidemiology, the most frequent anatomoclinical forms and the progressive features of cutaneous tuberculosis, we conducted a study in the area of Tunis over a 20-year period. PATIENTS AND METHODS: All cases of cutaneous tuberculosis observed between 1981 and 2000 in the dermatology department of the Habib Thameur hospital were included in a retrospective study. Diagnosis of cutaneous tuberculosis was challenging and required the correlation of clinical, biological and progressive features. RESULTS: Twenty-six patients were observed in the study. There were 12 men and 14 women with a mean age of 30.4 years (range: 6-74) and 20 p. 100 of infantile cases. Of the various patterns of cutaneous tuberculosis seen, 11 (42 p. 100) had lupus tuberculosis, 10 (38 p. 100) had scrofuloderma, 4 (15 p. 100) had tuberculosis verrucosa cutis and 1 child had a perianal tubercular ulcer. The Mantoux test was positive in 20/24 patients. Histological tuberculoid granuloma was seen in 25 cases (96 p. 100) associated with caseating necrosis in 10 cases (38 p. 100). All patients were treated successfully with triple or quadruple anti-tubercular drugs for 6 to 10 months. One patient exhibited a squamous cell carcinoma on a lupus tuberculosis scar four years later. DISCUSSION: The progression of cutaneous tuberculosis remains stable, ranging from 1.4 cases/year between 1981 and 1990 to 1.2 cases/year between 1991 and 2000. In our study, females were slightly more affected than men with a M/F sex ration of 0.86. Before 1984, scrofuloderma was the most frequent form among the cutaneous tuberculoses. Now the frequency of lupus tuberculosis has reached that of scrofuloderma, demonstrating the increase in the incidence of clinical pattern of cutaneous tuberculosis with strong immunity probably related to the improvement in health conditions and generalization of vaccination programs.

Adolescent↗
PubMed2004

"Were-wolf" cutaneous tuberculosis.

Lupus vulgaris is a variant of cutaneous tuberculosis. Its more destructive and mutilating clinical forms have become rarer in consonance of a general decline of cutaneous tuberculosis. It is rarely seen now in developed countries due to stringent control measures, improved quality of living and effective therapeutic regimens. Misdiagnosis, neglect, or late diagnosis may result in severe, ulcerative and mutilating "wolf eaten" skin lesions. This paper describes four such cases of "were-wolf" cutaneous tuberculosis. Early diagnosis and treatment is important to prevent much of the disfigurement.

Adolescent↗
PubMed2001

Childhood cutaneous tuberculosis: a study over 25 years from northern India.

AIMS: We undertook this study to analyse the pattern of childhood cutaneous tuberculosis prevailing in northern India over the past 25 years and to highlight differences from and similarities to adult tuberculosis. MATERIALS AND METHODS: Clinical records of children with cutaneous tuberculosis who attended the Nehru Hospital attached to the Postgraduate Institute of Medical Education and Research, Chandigarh, India, between January 1975 to December 1999 were analysed. RESULTS: Four hundred and two patients with cutaneous tuberculosis were examined during the 25-year period of observation. These patients formed 0.1% of the total dermatology outpatients. Seventy-five (18.7%) of these 402 cases were children (</= 16 years). There were 32 (42.7%) boys and 43 (57.3%) girls with a boy : girl ratio of 0.74 : 1. The majority of the children, 41 (54.7%) were in the 10-14 years age group. There was no significant boy or girl preponderance in any group other than in scrofuloderma (SFD), where girls significantly outnumbered boys at all ages. Of the various patterns of cutaneous tuberculosis seen, 40 (53.3%) had SFD, 30 (40.0%) had lupus vulgaris (LV), 3 (4.0%) had tuberculosis verrucosa cutis (TVC), 1 (1.3%) child each had tuberculids and tubercular gumma. No child had a tubercular chancre or acute miliary cutaneous tuberculosis. The neck was the commonest site afflicted with SFD and the face was the commonest site affected with LV. No child had generalized lymphadenopathy. Eighteen (60.0%) of the 30 children with LV had regional lymphadenopathy of which 15 (83.3%) had localized disease and 3 (16.7%) had disseminated disease. Of the 16 children with systemic organ involvement, 12 (75.0%) had regional lymphadenopathy. Of the 62 children in whom the data regarding vaccination status was available, 31 (50.0%) had been vaccinated and 31 (50.0%) had not. Among the vaccinated group no child had disseminated disease. Three (9.7%) children in the nonvaccinated group had disseminated disease. Information regarding Mantoux reactivity was available in 71 (94.7%) children, 61 (86.0%) with localized disease and 10 (14.1%) with disseminated disease. Of the 61 children with localized disease, 56 (91.8%) were Mantoux positive and of the 10 children with disseminated disease, only 5 (50.0%) were Mantoux positive (> 10 mm). Histopathologic reports were available for evaluation in all 75 children. Out of 30 cases of LV, 24 (80%) showed classical tuberculous histology. In contrast, out of 40 cases with SFD, only 19 (47.5%) showed classical histology. Classical tuberculous histology was noted in all 3 (100%) cases of TVC and 1 (100%) case each with tuberculids and gumma. Tubercle bacilli could be demonstrated in 4/30 (13.3%) cases with LV and 9/40 (22.5%) cases with SFD. Systemic involvement was seen in 16 (21.3%) children, of whom 3 (18.8%) had LV and 13 (81.3%) SFD. The lungs were the most common organs involved in 8 (50.0%) children followed by bone(s) in 4 (25.0%), abdomen in 2 (12.5%), and both lung and bone in 1 (6.3%) child. In contrast to adults, girls outnumbered boys in the childhood series; SFD was a common form of presentation in contrast to LV and TVC, tuberculous gumma and tuberculids were noted less often. In both children and adults, Mantoux reactivity did not correlate with the extent of the disease; patients with disseminated disease were found to be less often vaccinated with BCG and regional lymphadenopathy was noted more often in patients with disseminated disease. CONCLUSIONS: In the whole spectrum of cutaneous tuberculosis, there is a proportion of patients with dissemination (systemic involvement) who are of great epidemiological significance as they require a change in the standard therapeutic regimens recommended for cutaneous tuberculosis.

Adolescent↗
PubMed2006

Cutaneous tuberculosis in Morocco.

OBJECTIVE: To describe the salient epidemiologic, clinical, histopathologic, and bacteriologic aspects of cutaneous tuberculosis in Morocco. METHODS: A retrospective review of all cases of cutaneous tuberculosis at our hospital from January 1981 through December 2004. RESULTS: Two-hundred and sixteen cases of cutaneous tuberculosis were identified and included. Men and women were equally affected. The mean patient age was 29 years. Major clinical types of cutaneous tuberculosis were scrofuloderma and gumma (72%), lupus vulgaris (12%), tuberculosis verrucosa cutis (7%), tuberculids (6%), orificial tuberculosis (1%), and tuberculous chancre (1%). Systemic involvement was seen in 35%. Where performed (66%), 81% of subjects had positive Mantoux skin tests. Lesion biopsy for histopathologic study was performed in 81% of patients and showed classical tuberculous findings in 57%. Mycobacterium tuberculosis was isolated in culture from 9% of patients. CONCLUSION: Cutaneous tuberculosis is still a common disease in Morocco, and scrofuloderma and gumma are the most common clinical presentations.

Adolescent↗
PubMed1983

A case of cutaneous tuberculosis: primary or secondary?

A case of cutaneous tuberculosis in a 24-yr-old Mexican man occurring after a penetration injury is presented. Classification and pathogenesis of cutaneous tuberculosis are reviewed. The disease in the patient described had features overlapping the classification schemes, and the exact pathogenesis remains unclarified.

Adult↗
PubMed2004

Epidemiology of cutaneous tuberculosis in Japan: a retrospective study from 1906 to 2002.

BACKGROUND: Interest in tuberculosis has recently been revived, especially in association with the onset of acquired immunodeficiency syndrome (AIDS). In Japan, the incidence of tuberculosis has declined since the 1950s, but has shown a tendency to increase in the past 10 years. METHODS: To determine the patterns of prevalence of cutaneous tuberculosis in Japan, data for cutaneous tuberculosis cases recorded between 1906 and 2002 were obtained from the dermatologic clinic of Kyushu University Hospital. The population of tuberculosis-infected patients was stratified into groups encompassing 10-year periods. Each patient group was then classified as having true tuberculosis or tuberculid, as well as being classified by gender. The total number of patients with cutaneous tuberculosis analyzed was 1324. RESULTS: The incidence of cutaneous tuberculosis, both true tuberculosis and tuberculid, decreased between 1906 and 1935, increased between 1936 and 1955, and decreased again from 1955. The incidence of true tuberculosis was higher than that of tuberculid between 1906 and 1925. The incidence rates of true tuberculosis and tuberculid were equal from 1926 to 1945, and since 1946 the incidence of tuberculid has been higher than that of true tuberculosis. The incidence of tuberculid decreased between 1986 and 1995, but showed a dramatic increase between 1996 and 2000. The frequency of cutaneous tuberculosis was highest in the 10-49 year age group before 1980, but since 1981 has been highest in groups over 40 years of age. CONCLUSIONS: The incidence of cutaneous tuberculosis in Japan is decreasing and shows a shift towards older generations. However, there is an increase in the incidence of tuberculid, especially in elderly female patients.

Adolescent↗
PubMed1996

Detection of Mycobacterium tuberculosis complex DNA by the polymerase chain reaction for rapid diagnosis of cutaneous tuberculosis.

We assessed the polymerase chain reaction (PCR) technique to detect Mycobacterium tuberculosis complex DNA in 48 paraffin-embedded specimens from 32 patients with different variants of cutaneous tuberculosis, and compared the results with those of culture. A 123 bp product of the IS6110 insertion sequence specific of M. tuberculosis complex was amplified and confirmed by digestion with SalI restriction endonuclease. The time required for the procedure was 3 days. Thirty-seven samples (77.1%) were positive for M. tuberculosis complex DNA. No false positive results were obtained in nine negative controls. Of the 20 specimens tested by PCR and culture, the frequency of positivity was 90% for DNA amplification and 65% for culture. In seven cases of lupus vulgaris, the figures were 100% and 57%, respectively. In the 11 specimens culture negative or not microbiologically tested and PCR negative, evidence for tuberculous infection was provided by the correlation of various relative and absolute criteria. These results show that PCR amplification of the IS6110 insertion fragment is a rapid and accurate means for the detection of M. tuberculosis complex DNA in paraffin-embedded skin biopsies from patients with cutaneous tuberculosis, especially in paucibacillary lesions.

Adolescent↗