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Tuberculous coxitis with trochanteric bursitis manifesting a year after immigration to Germany: a case report
© The Author(s). 2018
- Received: 31 January 2017
- Accepted: 3 October 2018
- Published: 7 November 2018
Osteoarticular tuberculosis is rare in Germany. In particular, trochanteric bursitis is an extremely rare manifestation of osteoarticular tuberculosis. We describe a case of tuberculous coxitis with trochanteric bursitis, successfully treated with a fourfold tuberculostatic therapy.
We report the case of a 43-year-old human immunodeficiency virus-negative Sudanese man with osteoarticular tuberculosis, who was originally admitted with the suspected diagnosis of ankylosing spondylitis. Low grade fever together with the positive result of an interferon-gamma release assay test as well as findings from magnetic resonance imaging provided clues to the diagnosis. A definitive diagnosis could be set after a computed tomography-guided biopsy.
Apart from a rare involvement pattern of osteoarticular tuberculosis, including trochanteric bursitis, this case highlights the increasing importance of osteoarticular tuberculosis as a differential diagnosis of rheumatic disorders. With the growing migration flows from tuberculosis-endemic African countries, clinicians in central and northern Europe may be more frequently confronted with atypical involvement patterns of osteoarticular tuberculosis.
- Trochanteric bursitis
Extrapulmonary tuberculosis may affect various organs, causing a broad range of clinical manifestations [1–3]. It provides an important source of mortality, especially if not diagnosed in time. Moreover, in cases of osteoarticular tuberculosis, misdiagnosis of an autoinflammatory disease and the consequent immunosuppressive therapy can further enhance morbidity and mortality of tuberculosis. Here we report the case of a 43-year-old African refugee, who was referred to our clinic with the suspected diagnosis of ankylosing spondylitis.
Based on the above described findings, we made a diagnosis of tuberculous coxitis with trochanteric bursitis. Molecular testing yielded no evidence of mycobacterial resistance to isoniazid or rifampicin. We therefore started a four-drug anti-mycobacterial regimen with rifampicin, isoniazid, ethambutol, and pyrazinamide. Prednisolone was gradually reduced until its complete discontinuation. After 2 months of therapy, ethambutol and pyrazinamide were stopped. Rifampicin and isoniazid were continued for 7 more months. In the follow-up, 6 months after starting therapy and 2 months after completion of a 9-month anti-mycobacterial regimen, his CRP was normal, and low back pain and painful motility of his right hip resolved completely. Conventional radiographs of his right hip showed a slight joint space narrowing with no further pathological findings. In the absence of functional limitation no surgical treatment was required.
According to the last “Global tuberculosis report” of the World Health Organization, the number of new cases of tuberculosis has tended to decrease over the last decades [1, 2]. Despite that, tuberculosis remains an important source of mortality, especially in developing countries. In 2014 tuberculosis caused 0.97–1.3 million deaths worldwide. In Germany, tuberculosis is relatively rare. However, in view of the recent developments in migration of refugees from Africa and Arabic countries to Europe, tuberculosis may become a more frequent entity in central and northern Europe in the future . At present, osteoarticular tuberculosis accounts for 1–4.3% of all cases of tuberculosis . In Germany, approximately 20% of newly diagnosed cases of tuberculosis had an extrapulmonary focus . Osteoarticular tuberculosis accounts for 8.1% of newly diagnosed cases and is more common among patients of Asian or African origin. Tuberculous coxitis is thought to arise as a consequence of prior pulmonary tuberculosis through hematogenous spread of mycobacteria [3, 6]. Retrograde lymphatic or contiguous dissemination are also possible but less common.
Symptom onset is typically insidious (for example low grade fever, night sweats, and weakness) in cases of skeletal tuberculosis. Localized skeletal pain may appear later delaying the diagnosis of skeletal tuberculosis for many months . The mean time until diagnosis after symptom onset has been reported to be approximately 16–19 months.
A positive IGRA or tuberculin skin test (TST) is crucial for diagnosing tuberculosis . IGRAs have a higher specificity and sensitivity in comparison to TST. Despite the high specificity of the currently commercially available IGRAs, their sensitivity remains relatively low (ranging from 80 to 88% depending on the study and the assay) [9–11]. Skeletal tuberculosis presents no specific radiological findings [7, 12]. In cases of spinal tuberculosis, destruction of the intervertebral disc and both adjacent vertebral bodies is characteristic. The appearance of an osteolytic lesion can mimic metastatic tumors or primary osseous lesions. Computed tomography (CT) scans cannot discriminate between inflammatory and neoplastic lesions. MRI scans are more sensitive in showing early inflammatory lesions and, thus, suggesting the diagnosis of skeletal tuberculosis at an earlier stage. Typically, hypointense or isointense signals appear on T1-weigted images and hyperintense abnormalities appear on T2-weighted images of osseous and soft tissue lesions. The sensitivity of MRI can reach 100% whereas the sensitivity of CT may be around 88%.
A definitive diagnosis of extrapulmonary tuberculosis requires the obtaining of specimens from the relevant sites for microscopy and culture, although the sensitivity of these procedures is relatively low . CT-guided or ultrasound-guided needle aspiration is essential for accurate diagnosis of skeletal tuberculosis , which is also reflected in the presented case. Revelation of granulomas and detection of mycobacteria by means of imaging-guided needle aspiration is the gold standard for diagnosing tuberculosis. Isolation of mycobacteria may have therapeutical consequences by revealing possible drug resistances. The application of sensitive molecular techniques can be extremely helpful especially in cases of samples with low numbers of mycobacteria.
This case presents a rare involvement pattern of osteoarticular tuberculosis, including trochanteric bursitis. With the increasing migration flows from African countries, which are endemic for tuberculosis, osteoarticular tuberculosis arises as an important differential diagnosis of rheumatic disorders in central and northern Europe.
We would like to acknowledge the help of the technical stuff of the Institute of Pathology and of the Institute of Microbiology of the Hannover Medical University for helping with pathological examinations and microbiological examinations, respectively.
Availability of data and materials
All data supporting our conclusions are included in this report.
GS and TW wrote the paper. GS, AH, and ER treated the patient. CvF performed the imaging studies and CT-guided biopsy. Histological examination and PCR were performed by FL. RS and TW conducted the extensive workup. All authors read and approved the final manuscript.
Ethics approval and consent to participate
This is a report on a single patient. This case report complies with the Declaration of Helsinki. Approval was also obtained from the Ethics committee of the Medical University of Hannover (approval number: 3597–2017).
Consent for publication
A written consent form has been obtained from the patient for publication of this case report and any accompanying images and is available for review by the Editor-in-Chief of this journal.
The authors declare they have no competing interests.
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