Pediatric Spinal Canal Michael DiPietro, MD

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1 Pediatric Spinal Canal Michael DiPietro, MD John F Holt Collegiate Professor of Radiology University of Michigan Ann Arbor, MI USA MSUS #22 19 Sept. 2012

2 Objectives for Learners - spine Identify normal conus, cauda equina Know technique Know what looking for with closed occult dysraphism Know some forms of occult dysraphism Recognize caudal regression, sacrococcygeal mass (teratoma).

3 Vertebral anomaly

4 Pediatric Spine Sonography actually spinal canal sonography (spinal canal contents)

5 Two back masses Patient #1 Dermatofibrosarcoma protuberans Patient #2 Schwannoma

6 Does a back mass involve the spinal canal?

7 Successful Pediatric Spinal Canal Ultrasound Orientation Orientation Orientation Orientation Technique Technique Technique Technique

8 Pediatric Spine Sonography 28 years personal experience Pediatric Neurosurgeon

9 Normal Anatomy

10 Normal neonate & young infant exquisite panoramic detail EFOV image Courtesy of S. O Hara, MD

11 Neonate & young Infant exquisite panoramic detail combined image mdip

12 Locate conus medullaris tip 2 views TR Sag

13 Thoraco Lumbar Lumbo sacral L low L

14 Conus tip

15 Lumbo - sacral

16 Long Axis Sagittal Find sacrum and coccyx Adjust depth Ascend to and above lumbar.. As shown next

17 Sacrum Coccyx

18 Lumbosacral Junction

19 Mid to Low Lumbar

20 High Lumbar

21 Pediatric Spinal Canal Ultrasound Transducers - appropriate high frequency, high resolution extended field of view dynamic cine loop storage

22 Successful Spine Ultrasound Technique Technique Technique especially adequate flexion to separate posterior elements

23 Scenarios Skin covered defect with dorsal bulge Occult tethered spinal cord cutaneous marker (next slide) anal atresia (imperforate anus) lipoma Caudal regression SC teratoma

24 Neonatal - Occult tethered cord Cutaneous markers The Dimple Hemangioma Hair tuft Fatty hump Aplasia cutis

25 Why Spinal Canal US?? Most requests are to r/o occult tethered spinal cord

26 Definition Tethered Cord a pathologic fixation of the spinal cord in an abnormal caudal location, so that the cord suffers mechanical stretching, distortion, and ischemia with daily activities, growth and development D.H. Reigel, M.D. Pediatric Neurosurgeon Pittsburgh, PA

27 Tethered cord low down, stuck up Stuck up Low down

28 Occult tethered spinal cord tethered cord low down stuck up low (caudal) eccentric (often dorsal) tethering lesion (e.g. lipoma, thick filum, fibrolipoma) damped caudal oscillations

29 Cord oscillation cine M mode (Europe) Sag Sag

30 Cord oscillation cine M mode TR

31 Occult tethered cord Cutaneous markers The Dimple Hemangioma Hair tuft Fatty hump Aplasia cutis

32 Scenarios Skin covered defect with dorsal bulge Occult tethered spinal cord anal atresia lipoma Caudal regression SC teratoma

33 Teth. Cord Lipoma US MRI Correlate

34 Teth. Cord Lipoma US MRI Correlate

35 Scenarios Skin covered defect with dorsal bulge Occult tethered spinal cord anal atresia lipoma Caudal regression SC teratoma

36 Neonate VACTERL Anal atresia Low conus Thick echogenic filum terminale

37 Scenarios Skin covered defect with dorsal bulge Occult tethered spinal cord anal atresia lipoma Caudal regression SC teratoma

38 Sacral issues Hypoplastic or absent - conus shape Crescentic presacral Currarino Triad Vertebral anomaly

39 Newborn girl.

40 Posterior Prone - Lumbar Typical Appearance

41 Posterior Prone Lumbar Normal Abnormal NL conus Blunt or wedge conus

42 What might mom have?? Diabetes mellitus

43 Caudal regression syndrome Blunt or wedge shaped conus Here terminates above L1. Thick caudal FT ( ) Abnormal sacrum

44 Also has thick caudal filum terminale (FT not always thick)

45 Scenarios Skin covered defect with dorsal bulge Occult tethered spinal cord anal atresia lipoma Caudal regression SC teratoma

46 Interesting Case US only Case to OR Bypassed MRI All roads don t lead to Rome. All US studies don t lead to MRI.

47

48 Fetal MRI

49 Day 2

50 Initial Pelvic US Anterior via Bladder Sup Inf BL UT S S S R S

51 Post natal MRI Protocol MRI was ordered Spine study? Pelvis study?

52 Post natal MRI Protocol MRI was ordered Spine study? Pelvis study? We suggested Try US to sort the issues and plan the MRI

53 Post natal MRI Protocol Try Posterior US Might not need MRI At least better prescribe MRI protocol

54 Posterior US r/o Tethered Cord

55

56

57

58

59

60 Not cephalad to S5

61

62 Left TR - Posterior Right

63

64 Reviewed US with Surgeon Stressed clarity of images Logical approach Surgeon canceled MRI To OR Pathology = mature teratoma

65 Pathology Mature Teratoma

66 Another Case 9 month old female with hypoplastic sacrum.

67 Lumbosacral Junction Prone Sagittal

68 Lumbosacral Junction Cine transverse

69 Low lying tethered cord attached to a lipoma of the filum terminale continuous with a presacral mass. 9 mo old US diagnostic but anatomy not as clear as prior case get MRI Lumbosacral junction Prone Sagittal

70 T2 WI T1WI

71 ISSUES

72 Issues Cutaneous stigma Conus level Filum terminale thick, cyst Skin covered dysraphism (occulta) Skin open dysraphism (aperta) Pre-natal to post-natal Imperforate anus; VACTERL Abnormal sacrum (crescent; absent) Age (size) limit

73 Issues Cutaneous stigma Conus level Filum terminale thick, cyst Skin covered dysraphism (occulta) Skin open dysraphism (aperta) Pre-natal to post-natal Imperforate anus; VACTERL Abnormal sacrum (crescent; absent) Age (size) limit

74 Issues Cutaneous stigma Conus level Filum terminale thick, cyst Skin covered dysraphism (occulta) Skin open dysraphism (aperta) Pre-natal to post-natal Imperforate anus; VACTERL Abnormal sacrum (crescent; absent) Age (size) limit

75 Issue Age Limit? Age limit (i.e. size limit)? Techniques for older infant or child Who orders for older? Just get MRI for all ages? Spatial resolution neonatal US (0.01cm = 100 microns) Just get MRI older?

76 Older Child occult tethered spinal cord as older and larger visualization is limited off midline interlaminar window might locate conus tip and note +/- oscillation *be sure you and clinician know limits if need more information get MRI!!

77 Off midline

78 8 years normal conus tip position Oscillation +/- Conus tip if need more information get MRI

79 Cauda equina 9 yo 65 lb Angled from left Midline Angled from RT TR

80 Vertebra

81 Case 17-day-old girl who has bilateral equinovarus feet and kyphoscoliosis

82 Where is the spinal cord??

83 Prone Sagittal

84 L3 kyphoscoliosis, and dermal sinus tract with intradural lipoma (*), and tethered spinal cord * L3 L5

85

86 New case Neonate with esophageal atresia and TE fistula Multiple Vertebral Anomalies

87

88 Sup More lateral More midline

89

90

91 Short coccyx

92 Same case Neonate with esophageal atresia and TE fistula Multiple Vertebral Anomalies Spinal Cord and Filum Terminale

93 A B C

94 A B C

95 * * Likely ASA and spinal cord

96 Topics Covered Identify normal conus, cauda equina Know technique Know what looking for with closed occult dysraphism Know some forms of occult dysraphism Recognize caudal regression, sacrococcygeal mass (teratoma).

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