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| Pott disease | |
|---|---|
| Name | Pott disease |
| Synonyms | Tuberculous spondylitis, spinal tuberculosis |
| Field | Infectious disease, Orthopedics, Infectious disease |
| Symptoms | Back pain, fever, weight loss, neurological deficits |
| Complications | Spinal deformity, paraplegia, abscess |
| Onset | Insidious |
| Causes | Mycobacterium tuberculosis |
| Risks | Immunosuppression, HIV/AIDS, malnutrition, crowding |
| Diagnosis | Imaging, microbiology, histopathology |
| Treatment | Antitubercular therapy, surgery |
Pott disease is tuberculous infection of the vertebral column leading to vertebral body destruction, spinal deformity, and potential neurological compromise. It most often arises from hematogenous spread of Mycobacterium tuberculosis from pulmonary or extrapulmonary foci and presents insidiously with constitutional symptoms and localized back pain. Historically recognized in 18th‑ and 19th‑century clinical descriptions, it remains a significant cause of skeletal morbidity in areas where tuberculosis is endemic.
Patients typically report progressive localized back pain and stiffness, often with systemic features such as fever, night sweats, anorexia, and weight loss. Neurological manifestations range from radicular pain and sensory changes to motor weakness, myelopathy, and paraplegia when the spinal cord or cauda equina is compressed by vertebral collapse or paraspinal abscesses. Visible kyphotic deformity (gibbus) may develop after destruction of anterior vertebral bodies; in children this can progress during growth and lead to thoracic or thoracolumbar angular kyphosis. Constitutional signs may mimic presentations seen in Hodgkin lymphoma, HIV/AIDS, or disseminated Mycobacterium avium complex infection, complicating early recognition.
The causative organism is typically Mycobacterium tuberculosis complex, spreading hematogenously from a primary pulmonary or lymph node focus to the vertebral endplates via the Batson venous plexus. Infection begins in the cancellous bone of vertebral bodies, producing caseating granulomas, osteolysis, and collapse of anterior column structures; intervertebral discs are secondarily involved due to contiguous spread. Progressive vertebral destruction leads to kyphosis and instability; formation of cold abscesses can track along fascial planes to present as paraspinal, psoas, or mediastinal masses. Host factors such as coinfection with HIV/AIDS, chronic corticosteroid therapy, diabetes mellitus, malnutrition, or imprisonment increase susceptibility and alter granulomatous response.
Diagnosis combines clinical suspicion with imaging and microbiologic or histopathologic confirmation. Plain radiography may show vertebral body destruction and disc space narrowing; magnetic resonance imaging (MRI) is the most sensitive modality for early marrow changes, epidural extension, and neural compression, while computed tomography (CT) delineates bony destruction and surgical planning. Microbiologic confirmation derives from culture or nucleic acid amplification tests on sputum, blood, needle aspiration, or surgical biopsy; histopathology characteristically shows caseating granulomas with Langhans-type giant cells. Differential diagnosis includes pyogenic spondylodiscitis, metastatic disease from breast cancer, prostate cancer, or lung cancer, fungal osteomyelitis (e.g., Histoplasma capsulatum), and hematologic malignancies such as multiple myeloma.
Primary treatment is prolonged multidrug antitubercular therapy following national and international regimens derived from World Health Organization guidance, typically including isoniazid, rifampicin, pyrazinamide, and ethambutol during an intensive phase followed by continuation therapy. Duration is often extended compared with pulmonary tuberculosis depending on clinical, radiologic, and microbiologic response. Indications for surgical intervention include progressive neurological deficit, spinal instability, significant kyphotic deformity, large abscesses causing mass effect, or failure of medical therapy; procedures range from debridement and abscess drainage to decompression, corpectomy, and instrumented fusion using anterior, posterior, or combined approaches. Adjunctive measures include immobilization, analgesia, nutritional support, and rehabilitation; corticosteroids may be considered in selected cases with severe spinal cord compression. Management often involves multidisciplinary teams including specialists from Orthopedics, Neurosurgery, Infectious disease, and rehabilitation medicine.
Untreated or delayed treatment can result in irreversible neurological deficits such as paraplegia, persistent spinal deformity with cardiopulmonary compromise, and chronic pain. Cold abscesses may fistulize to adjacent structures producing psoas abscesses, retropharyngeal collections, or sinus tracts. Skeletal tuberculosis can be associated with dissemination to other organs including pulmonary, genitourinary, or central nervous system involvement such as tuberculous meningitis. Prognosis is improved by early diagnosis and adherence to antitubercular therapy; however, residual deformity or neurologic impairment may persist despite microbiologic cure, particularly in advanced disease or when presentation is delayed.
Skeletal tuberculosis accounts for a minority of extrapulmonary tuberculosis cases but represents a leading form of musculoskeletal infection in regions with high tuberculosis prevalence such as parts of Sub-Saharan Africa, South Asia, and Southeast Asia. Incidence correlates with the burden of pulmonary tuberculosis and risk factors including coinfection with HIV/AIDS, overcrowding, and socioeconomic deprivation. Historically prominent in 18th‑ and 19th‑century Europe, its relative frequency declined in high‑income countries with improved public health measures but has seen recrudescence associated with global migration and the HIV pandemic.
Prevention relies on effective control of Mycobacterium tuberculosis transmission through early detection and treatment of pulmonary cases, contact tracing, latent tuberculosis infection screening in high‑risk populations, and implementation of infection control in healthcare settings. Vaccination with bacille Calmette‑Guérin (BCG) provides variable protection against severe childhood forms of tuberculosis and is included in national programs in many endemic countries. Addressing social determinants—housing, nutrition, and access to healthcare—and scaling up combined efforts by agencies such as World Health Organization, national tuberculosis programs, and non‑governmental organizations are central to reducing the burden of spinal tuberculosis.
Category:Mycobacterial diseases