Pediatric TB Intensive Houston, Texas October 14, 2013
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1 Pediatric TB Intensive Houston, Texas October 14, 2013 Radiologic Presentation of Childhood TB Susan D. John, MD, FACR October 14, 2013 Disclosures I have no disclosures or conflicts of interest to report 1
2 Imaging TB Clinical diagnostic features are often nonspecific Culture of organism is slow and often ineffective Imaging may provide important and relatively specific clues Learning Objectives Recognize the characteristic imaging findings of tuberculosis in infants and children. Differentiate TB from other conditions with similar imaging findings. Use advanced imaging to solve special diagnostic problems. 2
3 Primary Tuberculosis Any system can be involved Thoracic Central nervous system Abdominal Musculoskeletal Multimodality imaging Common Imaging Modalities Radiographs Universally available Insensitive US Pleural disease Lymphadenopathy Abdominal findings 3
4 Common Imaging Modalities CT More sensitive for chest, abdomen disease Higher radiation exposure Requires IV, GI contrast MRI Important for CNS disease No ionizing radiation Requires sedation Not universally available Thoracic Primary Tuberculosis Imaging findings reflect progression of infection Ghon focus Drainage to regional lymph nodes Intrabronchial spread Penetration of adjacent spaces Hematogenous dissemination 4
5 Primary Pulmonary TB Radiograph Ghon focus Variable in size Often transient, hidden Mild pleural reaction May progress locally or lead to intrabronchial spread Ghon Focus 5
6 Air space disease with primary TB Pulmonary TB in Children Adult-type disease Less common Opacity in apical lung segments Apical and posterior Upper Apical Lower May lead to cavities and fibrosis 6
7 Pneumatoceles 7
8 Cavities Disseminated Pulmonary TB Miliary Hard to see in early stage Typical - <2mm size Larger nodules or ill-defined patches can occur in children Bilateral, evenly distributed 8
9 Miliary Nodules - CT 9
10 10
11 Teen with GI malignancy, TB Tree-in-bud pattern 11
12 Congenital TB Rare form of transmission Chest radiograph may resemble other types of neonatal pneumonia Lymphadenopathy key to the diagnosis 12
13 13
14 Lymphadenopathy Hallmark of primary TB Only radiologic finding in 50% More common < 5 yrs of age Radiographs Difficult to see with confidence PA and lateral views needed Hilar, paratracheal most common 14
15 15
16 Normal Lymphadenopathy 16
17 17
18 Lymphadenopathy CT improves visualization Up to 60% with normal CXR have LNs on CT (Delacourt, 1993, Arch Dis Child 69:430.) CT technique Use IV contrast Multidetector improves resolution Lymphadenopathy Sites on CT Subcarinal (90%) Hilar (Bilateral 72%) Anterior mediastinum Precarinal Right paratracheal Multiple sites (96%) (Andronikou, Pediatr Radiol (2004) 34:232) 18
19 T Lymphadenopathy on CT Paratracheal Hilar Subcarinal Size criteria Lymphadenopathy in PTB Generally use 1 cm or greater Not well-established Appearance Low-density center with enhancing rim Interrupted peripheral enhancement Calcification uncommon 19
20 Miliary TB with Calcified Lymphadenopathy and Granulomata Previous Pulmonary TB Calcifications (15-20% on CT) Occurs in areas of caseation 6 mons 4 yrs after infection Not seen in young infants Occurs earlier in young children Other rare findings Bulla Bronchiectasis 20
21 TB with calcified lymph nodes 21
22 Thymus is normally prominent in infants and should not be mistaken for mediastinal disease 22
23 23
24 No IV contrast 24
25 Lymphadenopathy on CT How Good Are We? Andronikou, Pediatr Radiol (2005) 35:425. Only moderate agreement between 4 radiologists Rt hilar, subcarinal best Lt hilar, anterior mediastinal worst Thymus causes confusion Fletcher, J Clin Oncol (1999) 17:2153 Hodgkins disease experts don t agree 25
26 Lymphadenopathy in PTB- Complications Airway compromise Extrinsic compression Obstructive emphysema Atelectasis Left > Right Bronchial wall granulomas Intrabronchial caseous material 26
27 Atelectasis 27
28 1 month later 28
29 7 days later 29
30 Bronchial Compression/Endobronchial Granuloma Penetration of Adjacent Spaces Pleural effusion Unilateral = direct spread Bilateral = hematogenous Transudate most common Hypersensitivity response Size variable Pericardial effusion Subcarinal lymph nodes 30
31 31
32 Patchy or Nodular 32
33 Pleural Effusion E Small Pleural Effusion with Decubitus View 33
34 CNS TB in Children Hematogenous most common Spread from calvarium, middle ear Manifestations Focal disease Meningitis Infarction Hydrocephalus TB Localized CNS Disease Tuberculoma most common Abscess uncommon CT (use IV contrast) Enhancement patterns Usually < 2 cm diameter Rarely calcify 34
35 TB Meningitis Diffuse most common CT Non-contrast 50% show increased density in basal cisterns Contrast prominent basal enhancement (double line sign) MRI similar findings 35
36 36
37 37
38 TB Meningitis with Communicating Hydrocephalus Post-meningitis Infarcts 38
39 Abdominal TB in Children Less common than in adults Findings Lymphadenopathy Solid organ lesions Ascites Bowel wall involvement Inflammatory mass Omental thickening Abdominal TB Lymphadenopathy Para-aortic, mesenteric, periportal most common Commonly calcifies Solid organs Calcified or low density lesions Granulomas, abscess 39
40 12 year old with night sweats, 20 lb wt loss, and back pain 40
41 Solid Organ Disease Microabscess or granuloma Liver, spleen High frequency ultrasound most sensitive Abdominal TB Ascites May be high density on CT (HU 20-45) US useful but non-specific Ileocecal region Bowel wall thickening Inflammatory phlegmon 41
42 TB Peritonitis 42
43 Skeletal TB in Children Uncommon (1-2% of all cases) Hematogenous origin Primary site often unknown Granuloma >> caseating focus >> trabecular destruction >> cortical destruction >> periosteal, soft tissue involvement Common site TB of Spine Deposited in anterior aspect of vertebral body Spread to disc, subligamentous, soft tissues Posterior elements seldom involved Multiple contiguous vertebrae (85%) 43
44 TB of Spine Not seen early radiographically MRI valuable T1 low signal T2 heterogeneous high signal CT Cortical bone sclerosis, destruction TB Spondylitis 44
45 Spinal Soft Tissue Extension Paravertebral, epidural mass common May lead to cord compression Subligamentous spread Cervical retropharyngeal mass Extension along iliopsoas Buttocks, groin, chest TB Arthritis 2 nd most common site in children Monoarticular Hips, knees most common Metaphyseal infection May cross physis to epiphysis 45
46 TB Arthritis Imaging findings Joint effusion Periarticular demineralization Cortical irregularity Osteolytic lesions Periosteal new bone Late findings Narrowed joint, overgrown epiphyses Ankylosis Joint Ultrasound Normal Joint effusion 46
47 TB Osteomyelitis in Children Uncommon only 11% of skeletal cases Solitary lesions most common Chest radiograph often normal Common sites Skull Hands, feet Ribs TB Osteomyelitis - Patterns Cystic Most common Well-defined lytic lesion Mild sclerosis, expansion Infiltrative Moth-eaten, ill-defined Nonspecific (Ewings, fungal, chronic pyogenic osteomyelits) Spina ventosa (dactylitis) 47
48 TB of Femur 48
49 TB of the Sternum Calvarial TB 1% of all skeletal tuberculosis 75% of patients are <20 yrs age Parietal bone most common site > 80% have bone destruction Frequently visible on radiographs Discrete lytic circumscribed lesion 92% have subgaleal swelling 49
50 Calvarial TB Conclusion Primary TB in children has variable and often non-specific appearances on imaging Lymphadenopathy remains a key finding Use advanced imaging when radiographs are suggestive or confusing 50
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