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    P O T T S D I S E A S E: A Radiological Review of

    Tuberculous

    Spondylitis

    Stella SafoGillian Lieberman, MD

    April 2009

    Harvard Medical School

    Beth Israel Deaconess Medical Center

    http://focus.hms.harvard.edu/2009/011009/index.html
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    Agenda1 . Explain the evaluation, diagnosis and

    treatment

    of

    spinal tuberculosis.

    2. Review features of spinal tuberculosis on radiographs, CT and MRI.

    3. Focus on the diagnosis of spinal TB using radiographs , as

    this is the primary modality available in many resource limited settings where spinal TB is endemic.

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    Our Patient: Initial Presentation

    A 40 year old healthy Kenyan woman, Ms B.G, presented to her PCP

    with a 1 yr history of low back pain (LBP)

    that began after a fall.

    Sharp, unremitting pain exacerbated by movement, without radiculopathy

    Physical exam was unremarkable

    Minimal relief with NSAIDS and physical therapy

    She became pregnant

    three months later.

    LBP continued and worsened throughout pregnancy

    Postpartum

    Developed bilateral anterior thigh paresthesias

    exacerbated by sitting

    Due to failure to respond to conservative therapy, she was sent for radiological evaluation.

    Further exploration of this topic requires a review of the anatomyof the spine and of a differential diagnosis of low back pain

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    Spine Anatomy

    http://www.columbiaspine.org

    http://www.fla-ortho.com

    http://www.sofamordanek.com

    C E R V I C L

    T H O R C I C

    L U M R

    T r a n s v e r s ep r o c e s s

    S p i n o u s

    p r o c e s s

    Ve r t e b r a l

    b o d y

    I n t e r v e r t e b r a ld i s c

    P e d i c l e

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    Differential Diagnosis Low Back Pain MECHANICAL

    Degenerative disk disease, compression fracture, musculoskeletal

    sprain or strain

    NEUROGENIC Disk herniation, sciatica, spinal stenosis, infection, malignancy,

    connective tissue disorder (ie. ankylosing

    spondylitis)

    Others: VISCEROGENIC

    UTI, pyelonephritis, retroperitoneal tumor or bleed VASCULAR

    Abdominal aortic aneurysm PSYCHOGENIC

    With this differential in mind for patient BG,further imaging revealed infection of the spine.

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    Introducing Pott Disease Known by many names : spinal tuberculosis, tuberculous

    spondylitis, Pott disease or Potts disease

    First described in 1782 by Percival Pott , a British orthopedic surgeon.

    Differential diagnosis of Pott disease Pyogenic or fungal osteomyelitis

    Eosinophilic granuloma

    Multiple myeloma Multiple compression fractures Note : Brucellosis of the spine and Pott disease are radiologically

    indistinct.

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    Our Patient: Imaging

    Ms. BGs diagnosis was made based on her imaging

    Imaging

    Plain film of the spine demonstrated compression fracture L12 with anterior kyphosis

    MRI spine revealed

    T12 L3 vertebral osteomyelitis

    L12 compression fractures with forward angulation

    Cauda

    equina

    impingement

    Left psoas abscess

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    Our Patient: Radiograph

    PACS, BIDMC

    Lateral radiograph

    Anterior collapse of L1,L2 vertebrae with loss of disk

    space. ( *).

    Central lucencies

    within the L1vertebrae ( *).

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    Our Patient: CT Torso

    PACS, BIDMC

    Noncontrast

    axial CT

    Large left psoas

    abscess withhypoattenuated core region.

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    Our Patient: MRI

    Spine

    PACS, BIDMC

    Sagittal

    T2W

    Destruction of L1-L2 disk space and collapse of adjacent vertebral bodies ( *) withretropulsion into the spinal canal( *). In image, edema in T12 to L3 vertebral bodies ( *),suggestive of spinal osteomyelitis.

    1 2

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    Our Patient: Clinical Outcome Diagnosis : Pott

    disease was diagnosed based on

    Radiologic

    findings

    1) psoas

    abscess

    2)

    continuous

    anterior

    vertebral

    body

    destruction

    3) cord compression

    Emigration from an area with endemic tuberculosis Indolent nature of symptoms

    Treatment : Patient was placed on bed rest and fitted for a thoracolumbosacral

    orthosis(TLSO)

    Underwent debridement

    and spinal stabilization Mycobacterium tuberculosis was isolated from surgical specimens and

    sputum Placed on a long course of Rifampin, Isoniazid, Pyrazinamide, & Ethambutol

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    Pott Disease: Epidemiology

    Pott

    disease is uncommon in the United States U.S. versus Kenya (homeland of case patient)

    4/100,000/yr : 384/100,000/yr Spinal tuberculosis loosely reported as 100 200 cases yearly

    Skeletal tuberculosis Accounts for 10% of all cases of extrapulmonary

    TB

    Targets the hips, knees, spine Spinal tuberculosis is most common, accounts for 50% all skeletal TB cases

    Clinical presentation varies by geographic location High TB prevalence

    Pott

    disease is commonly seen in children Targets thoracic vertebrae

    United States Seen in immigrants from endemic countries, immunocompromised,

    men > women Targets lumbar vertebrae

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    Pott Disease: Pathophysiology

    Tuberculosis infiltrates the spine via Hematogenous

    spread through the dense vasculature of cancellous

    bone of the anterior vertebral bodies

    Lymphatic spread from para aortic lymph nodes possible but rare

    Up to 75% of infected individuals develop a soft tissue infection Commonly occurs in the psoas

    muscle cold abscess Known as cold abscess because forms slowly and does not normally

    present with heat, inflammation or pain

    Paraspinal

    fistula which may form a communication with the chest

    wall or pelvic floor

    Left untreated, degeneration and inflammation of the vertebrae causes Herniation

    into the cord space cord compression and cauda equina

    Kyphosis gibbous (severe kyphosis) Paraplegia

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    Pott

    Disease: Complications

    Pappou et al.- http://ovidsp.tx.ovid.com.ezp-prod1.hul.harvard.edu/spb/ovidweb.cgi?WebLinkFrameset

    Oguz et al.- http://www.springerlink.com.ezp-prod1.hul.harvard.edu/content/h482j21x5548q078/fulltext.pdf

    Gibbous

    Lateral radiographs andT2W MRI

    Young male with gibbus

    deformtity

    (A) atthoracolumbar

    junction

    seen on radiograph (B) andT2W MRI (C).

    Cord Compression

    Radiograph (1), sagittalCT reconsturction

    (2) and MRI (3) of a 70 year oldman with Pott

    disease.

    Note continuousvertebral bodydestruction ofthoracolumbar

    spine,

    causing severekyphosis.

    Patient developedcompression of theconus

    medullaris,resulting in inability toambulate.

    2 3

    1

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    Pott

    Disease: Diagnosis Physical Diagnosis:

    Usually presents with 4 month to 3 year history of low back pain

    with or without associated neurological deficits.

    Signs of nearby cold abscess or fistula may be present

    Only 20% present with concomitant TB lung infection

    Routine lab tests and the Mantoux

    skin test are of little diagnostic aid

    KEY POINT: Must maintain high clinical suspicion in order to makethe diagnosis of tuberculous spondylit is in a timely fashion.

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    Pott

    Disease: Imaging Menu of tests

    May start with plain film

    to visualize gross deformities i.e. kyphosis, fracture. CT is good for visualizing disco vertebral lesions and paravertebral

    abscess, particularly for abscess calcification.

    MRI

    provides the best visualization of the extent of spinal canal and soft tissue involvement. Allows for early detection.

    Examples of types ofimaging modalities

    >

    Lateral Radiograph-

    shows signs of early diskdestruction ( *)

    > Coronal T2W MRI-

    diskdestruction and bonemarrow edema ( *)

    > Transaxial

    CT-

    large leftparavertebral

    abscess ( *)

    R A D I O G R A P H C TM R IOguz et al.- http://www.springerlink.com.ezp-prod1.hul.harvard.edu/content/h482j21x5548q078/fulltext.pdf

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    Pott Disease: Additional Imaging

    Lesser used imaging modalities include:

    Bone scintigraphy

    Ultrasound

    useful in visualizing

    paraspinal

    abscesses

    Nigg et al.- http://www.springerlink.com.ezp-prod1.hul.harvard.edu/content/74l418224t055432/fulltext.pdf

    46 year old male withspinal TB on bonescintigraphy

    Increased radionuclideuptake in thoracic and

    lumbar spine ( *)secondary to increasedbony metabolism frominfection.

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    Radiographs: General Features Features of Potts

    on radiograph include Signs of infection with lytic

    lucencies

    in anterior portion of vertebrae Disk space narrowing

    Erosions of the endplate Sclerosis resulting from chronic infection Compression fracture Continuous vertebral body collapse

    Kyphosis; gibbous (severe kyphosis)

    Atypical features

    Soft tissue swelling from paraspinal

    abscesses, +/

    calcification Involvement of only one vertebral body

    Involvement of several vertebral bodies without

    intervertebral

    discitis

    Bowing of rib cage secondary to collapse of multiple vertebral bodies

    Destruction of lateral or posterior aspects of vertebral bodies

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    Radiographs: Erosions Lucent area in lateral aspect of adjacent vertebral bodies erosions (*)

    Loss of intervertebral

    disk space (*) Central lucency

    (*) with surrounding sclerosis suggesting chronic infection (*)

    Pertuiset et al.- http://ovidsp.tx.ovid.com.ezp-prod1.hul.harvard.edu/spb/ovidweb.cgi?QS2

    http://ovidsp.tx.ovid.com.ezp-prod1.hul.harvard.edu/spb/ovidweb.cgi?View+Image=00005792-199909000-00003%7CFF1&S=AFDGFPDLBDDDFBIPNCGLDHJJLKMNAA00&WebLinkReturn=Full+Text=L%7CS.sh.15.16%7C0%7C00005792-199909000-00003http://ovidsp.tx.ovid.com.ezp-prod1.hul.harvard.edu/spb/ovidweb.cgi?View+Image=00005792-199909000-00003%7CFF3&S=AFDGFPDLBDDDFBIPNCGLDHJJLKMNAA00&WebLinkReturn=Full+Text=L%7CS.sh.15.16%7C0%7C00005792-199909000-00003http://ovidsp.tx.ovid.com.ezp-prod1.hul.harvard.edu/spb/ovidweb.cgi?View+Image=00005792-199909000-00003%7CFF1&S=AFDGFPDLBDDDFBIPNCGLDHJJLKMNAA00&WebLinkReturn=Full+Text=L%7CS.sh.15.16%7C0%7C00005792-199909000-00003
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    Radiographs: Endplate Destruction

    Private Collectionof Ferris Hall MD

    Private Collectionof Ferris Hall MD

    Image 1Lateral radiograph ofspinal TB in a 23 yo

    man

    showing endplateerosion, loss of diskspace (*) , and anteriorcompression fracture ofthe lumbar spine.

    Image 2Lateral radiograph of 56yo

    man with Pott

    diseasewith additional features

    of sclerosis at vertebralendplates that haveundergone severecompression anderosion (*).

    21

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    Radiographs: Osteosclerosis

    Private Collection o fFerris Hall MD

    Private Collection o fFerris Hall MD

    1 2

    Image 1Frontal radiograph 45yo

    female. Note

    compression fracturewith loss ofintervertbral

    diskspace (*).

    Image 2Lateral radiograph of56 yo

    male. Similarly,note compressionfracture and secondaryosteosclerosis

    (*).

    R di h

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    Radiographs: Atypical Features

    72 yo

    M with

    long history of long history of spinal TB.

    Note collapse of multiple thoracicvertebrae ( *) with resultingbowing in of ribs ( *).

    Paraspinal

    abscess seen with circularcalcified mass ( *).

    Private Collectionof Ferri s Hall MD

    Private Collectionof Ferris Hall MD

    72 yo

    M with longhistory of long history of spinal TB.

    Collapse of mulitplethoracic vertebrae ( *)resulting in severekyphosis

    (*).

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    CT: Features

    Features on CT

    Soft tissue findings

    Abscess with calcification is diagnostic of spinal TB; CT is excellent modality to visualize soft tissue calcifications

    Pattern and severity of bony destruction

    Pattern of vertebral body destruction

    framentary, osteolytic,

    localized and sclerotic, and subperiosteal

    Used to guide needle in percutaneous

    needle biopsy of

    paraspinal

    abscess

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    CT: Calcification

    PACS, BIDMC

    Noncontrast

    axial CT

    Large psoas

    abscess ( *) with central calcification ( *); these features are highly diagnostic ofspinal TB.

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    CT: Bony Destruction

    Noncontrast

    axial CT

    Extensive vertebral body destruction causing bony fragments ( *). Destruction of cancellous

    bone

    indicated by hypoattenuation

    of central vertebral body ( *).

    PACS, BIDMC

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    MRI: Features

    Highly sensitive and specific for spinal TB

    Provides early

    detection

    Best to distinguish exact extent of spinal cord and soft tissue involvement

    Features Edema of vertebrae and disk space

    Signs of spinal compromise i.e. cord compression Note : Poorly visualizes calcification in abscesses

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    MRI: Spinal Cord Involvement

    PACS, BIDMC

    Sagittal

    T2W (Images 1-3)and axial T1W (Image 4)

    High intensity activity in T12 to L3 vertebrae indicative of infection ( *) (*). Complete destruction ofvertebral bodies with osseous retropulsion

    into the spinal canal, causing cauda

    equina

    (*). On axialview, note destruction of vertebral body with loss of circular shape( *).

    1 2 3

    4

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    Pott Disease: Treatment

    Various imaging modalities are useful in determining extent of disease. Treatment options then depend on the degree of spinal destruction.

    Most practicing clinicians simply define Potts

    as

    EARLY

    or LATE

    disease.

    GATA ClassificationOguz et al.- http://www.springerlink.com.ezp-prod1.hul.harvard.edu/content/h482j21x5548q078/fulltext.pdf

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    Conservative Treatment

    Early Disease:

    Treat with a four drug regimen for six to twelve months

    Common antibiotics

    are

    Rifampin,

    Isoniazid,

    Pyrazinamide, Ethambutol

    Most individuals experience full resolution of symptoms with appropriate anti tuberculosis treatment

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    Surgical Interventions Late Disease:

    Loosely defined by neurologic deficits, spinal kyphosis

    >40%, or failure of medical therapy

    Surgical debridement, abscess drainage, and/or vertebral fusion in addition to antibiotics

    PACS, BIDMC

    Ms. BG post surgery

    Young man with gibbous deformity ( *) status postinstrumentation surgery.Note stabilization of spine and resolution of gibbous ( *).

    Lateral radiograph

    Our index patient,Ms. BG afterspinaldebridement andvertebral fusion.

    Oguz et al.- http://www.springerlink.com.ezp-prod1.hul.harvard.edu/content/h482j21x5548q078/fulltext.pdf

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    Summary Imaging modalities

    are plain film, CT and MRI; MRI is gold standard for

    imaging spinal TB.

    Spinal tuberculosis is not common in U.S., therefore must maintain high clinical suspicion so as not to overlook diagnosis, especially among immigrant populations.

    Diagnosis and treatment of spinal TB in endemic areas is difficult given resource limitations; rely on radiographs and clinical signs to facilitate early diagnosis.

    Conservative versus surgical treatment of Pott

    disease depends on degree of spinal destruction,

    making early diagnosis essential for a

    positive outcome.

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