Phakomatoses - Smirniotopoulos (RSNA 2007)

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Phakomatoses - Smirniotopoulos (RSNA 2007)

Transcript of Phakomatoses - Smirniotopoulos (RSNA 2007)

Educational Objectives Describe

The PhakomatosesJames G. Smirniotopoulos, M.D.Uniformed Services University 4301 Jones Bridge Road Bethesda, MD 20814 Voice: 301301-295295-3145 FAX: 301301-295295-3893 Visit us on the WEB: http://rad.usuhs. edu

why NFNF-1 is truly Neurofibromatosis Neurofibromatosis Describe three neoplasms caused by the chromosome 22 mutation in NFNF-2 Explain why Tuberous Sclerosis is a disorder of neuronal migration

Dorlands Medical Dictionary

Bummer of a birthmark, Hal


PHAKOMATOSES: Why Study Them? They

Phakomatoses Mnemonic Tool NFNF-1 NFNF-2

are COMMON diseases DIAGNOSED by Imaging GENETIC Implications SCREEN Relatives SURVEILLANCE of Affected

(von Reck's) (Bilateral VS Syndrome) SCLEROSIS

TRUE Neurofibromatosis #17 M.I.S.M.E. #22 TUBEROUS

Pringle's "HAMARTOMA" Disease


1st Mutation HitGerm Line Mutation: Ovary, Testis, or Embryo

Tumor Suppressor Gene: Two Hit Hypothesis


2nd Mutation Hit

Neurofibromatosis Type 1 (NF(NF-1)- von Recklinghausen Disease - "True" Neurofibromatosis - Prominent Cutaneous Signs - Chromosome 17q

Somatic Mutation

Neurofibromatosis Type 2 (NF(NF-2)- Bilateral Acoustic Schwannoma - "Central Neurofibromatosis" - Minimal Skin Manifestations - Chromosome 22q

One copy of gene, some protein

No gene No protein

Neurofibromatosis Type 1 von Recklinghausen DiseaseChromosome 17

NIH Diagnostic Criteria: 2 from list

CafeCafe-AuAu-Lait spots 6 or more 5 mm child, 15 mm adult

Neurofibromas - 2 or more Plexiform Neurofibroma - 1 Axillary (Intertriginous) Freckling - 1 Optic Glioma Lisch Nodules (Iris) - 2 or more "Distinctive Bone Lesions" 1st degree Relative with NFNF-1


Lisch Nodules

LISCH Nodules (Iris Hamartomas) Penetrance > 90% Specificity > 90% Translucent/pigmented Small ( < 3mm.), SlitSlit-Lamp Exam

OPTIC GLIOMA Up to 15% of patients Pilocytic Astrocytomas Benign ("Hamartoma("Hamartoma-like"), Tx? True Neoplasms, spread along SAS up to 1/2 of Childhood ONG w/NFw/NF-1


Optic Nerve Glioma

Optic Nerve Glioma

Bilateral Optic Nerve Glioma



CafeCafe-auau-Lait spots Intertriginous Freckling Neurofibromas (Skin and SubQ) Fibroma Molluscum (TNTC NFB) Elephantiasis Neuromatosa diffuse skin thickening/plexiform NFB -oror- focal gigantism

Courtesy of Greg Petermann, M.D.

Caf-au-lait spot

Axillary Freckle


NEUROFIBROMATOSIS - 1Bone Dysplasia and Remodeling Macrocephaly Craniofacial dysplasia especially sphenoid Vertebrae

(scalloping, scoliosis) Pseudoarthrosis especially congenital Genu

Valgum/Varum Twisted "Ribbon Ribs"

Sphenoid Dysplasia

Sphenoid Dysplasia

Courtesy of Greg Petermann, M.D.

Courtesy of Greg Petermann, M.D.

Progressive Pseudoarthrosis


Bowing Deformity

8 mo. Later

Hyperemic demineralization


Focal Gigantism

NERVE SHEATH TUMORSSchwannoma (Sporadic >> NFNF-2 > NFNF-1) focal mass usually sensory root, cranial and spinal nerves

Neurofibroma usually NFNF-1, esp. if spinal or paraspinal spindle or dumbdumb-bell lesion

Plexiform Neurofibroma (usually NFNF-1) diffuse or fusiform enlargement

Malignant Peripheral Nerve Sheath Tumor NFNF-1 or Sporadic

Neurofibroma vs. Schwannoma


Neurofibroma Schwann cells Fibroblasts Acellular material Infiltrating Resect Parent Nerve

Schwannoma Schwann Cell Neoplasm Secondary vascular changes Mostly cellular Encapsulated Nerve Sparing Surgery


Distribution of Nerve Sheath TumorsIntraIntra-Cranial => Schwannoma Sporadic >> NFNF-2 Spinal => Both Types (S >> N) Dumbbell => Both (N >> S) PNS => Both Cutaneous => Neurofibroma Usually N in NFNF-1


Neurofibromatosis : Spine Scoliosis

Acute Cervical Kyphoscoliosis

(NF(NF-1, only?)

Simple ("idiopathic") Acute Cervical Kyphosis

Dural Ectasia (NF(NF-1, only?) Vertebral Scalloping Arachnoid "cysts" Lateral Thoracic meningocele

Neurofibromatosis : Spine Neurofibroma

(NF(NF-1) Osteoporosis (NF(NF-1, only?) Idiopathic Parathyroid Adenoma Schwannoma

Neurofibromatosis: Enlarged Neural Foramen

Nerve Sheath Tumor Neurofibroma NFNF-1 >> sporadic "dumbbell "dumbbell shape

Schwannoma sporadic >> NFNF-2

(NF(NF-2) Meningioma (NF(NF-2 Ependymoma (NF(NF-2)

Mesodermal Defect NFNF-1 only? Dural weakness Bone weakness


Multiple Dumbbell Lesions

Neurofibroma vs. Schwannoma


Rib NotchingAortic Coarctation Older than 5-6 years 3-9 possible Ribs 5-8 most often 1-2 arise from subclavian artery Usually Bilateral Unilateral on the Right if Coarctation involves Left Subclavian origin A-V Fistulae Nerve Sheath tumors

Plexiform NF

Multiple Neurofibromas

Tumors of the Nerve Sheaths

Courtesy of Greg Petermann, M.D.

NEUROFIBROMATOSIS - 1: DBOs MR Signal Abnormalities

T1W Bright Foci T2W Bright Foci globus pallidus

High signal in Brain on T2 Resolve over age 10

What in the heck are they??

w/o mass, don't enhance Cerebellar peduncles, Pons, midbrain globus pallidus, thalamus, optic radiations

May become Neoplasms (uncommon)Courtesy of Greg Petermann, M.D.

Ectopic Schwann cells, Melanocytes ?? Intramyelin Vacuoles Dysmyelination ?? Intracellular proteinaceous fluid ?


DBO DBOs of NFNF-1: Cerebellar peduncle

Early ----- Later

Neurofibromatosis Type 1vs.

James Brown or James S.?Little man behind the Curtin Hugh Curtin of the Mass Eye and Ear

Neurofibromatosis Type 2

Neurofibromatosis Type 2 or Wishart DiseaseChromosome 22


Neurofibromatosis Type 1 (NF(NF-1)- von Recklinghausen Disease - "True" Neurofibromatosis - Prominent Cutaneous Signs - Chromosome 17q

Neurofibromatosis Type 2 (NF(NF-2)- Bilateral Acoustic Schwannoma - "Central Neurofibromatosis" - Minimal Skin Manifestations - Chromosome 22q



Incidence: 1/50,000 Inheritance: Autosomal Dominant Age at Presentation: Birth to 40's (peak in 20 20s) Sx at Presentation: Hearing loss from VS Diagnostic Criteria: VIII masses Chromosome Abnl.: 22 Cutaneous Findings: minimal (skin tags) CNS Findings: Schwannoma, Meningioma, Ependymoma (intramedullary spinal cord)

CNS Neoplasms - Chromosome Loss of Heterozygosity Schwannoma Meningioma

- 22q - 22q (long arm) Ependymoma - 22 NOT Neurofibroma NOT Astrocytoma NOT Optic Glioma



NF-2 ("CENTRAL"), 1 OR MOREBilateral VIIIth Masses Relative with NFNF-2 and either:

Intracanalicular Schwannoma

Unilateral VIIIth Mass Any Two: "Neurofibroma", Meningioma, Glioma, Schwannoma, (Congenital) Lens Opacity

Bilateral Vestibular T1W axial Schwannoma

SCHWANNOMA5-10% of All CNS Tumors Benign, Slowly growing F > M (Intracranial), M > F (Spinal) 30's - 60's, w/NFw/NF-2 10's - 30's Sensory Nerves (usually): CNN VIII (Sup.Vestibular), V, X Spine: Dorsal Roots

Majority (>90%) are Sporadic Multiple in NFNF-2, Bilat.VIII Pathognomonic

From Laszlo Mechtler, DNI


Bilateral Vestibular Schwannoma

Bilateral Vestibular Schwannoma

Bilateral vestibular and one Trigeminal Schwannoma

Multiple Meningiomas


8th 8th

T1-contrast axial

From Laszlo Mechtler, DNI



Multiple Schwannomas and Meningiomas

Multiple Schwannomas, Meningiomas, and Ependymomas


M I S M E SyndromeM

ultiple I nherited S chwannoma M eningioma E ependymoma

Tuberous Sclerosis or Bourneville DiseaseChromosomes 9 and 16


TUBEROUS SCLEROSISAUTOSOMAL DOMINANT No Racial/Sexual High Spontaneous Mutation High Penetrance "SPORADIC" overover-reported

Multiple Genes TSC1 - 9q TSC2 - 16p

Hyman MH, Whittemore VH:"National Institutes of Health Consensus Conference:tuberous sclerosis Complex" Arch Neurol 2000; 57: 662-665.

Tuberous Sclerosis, NIH Consensus Conference Major Features: Minor Features:Facial angiofibroma or forehead plaque Ungual or Periungual fibroma >3 Hypomelanotic macules Shagreen patch Multiple retinal nodular hamartomas Cortical Tuber Subependymal Nodule Subependymal Giant Cell Astrocytoma Cardiac rhabdomyoma Lymphangiomyomatosis Renal angiomyolipoma

Adenoma Sebaceum

Multiple dental enamal pits Hamartomatous rectal polyps Bone cysts White matter migration lines Gingival fibromas NonNon-renal hamartoma Retinal achromic patch "Confetti" skin lesions Multiple renal cysts

AKA PRINGLE'S DISEASE NOT present at birth develop before puberty nasolabial fold ->bi>bi-malar papules of angiofibroma

Definite TS - (2 Major) or (1 Major + 2 Minor) Probable TS - 1 Major + 1 Minor Possible TS - (1 Major) or (2 Minor)


Pringles Disease

Pringles Disease

Pringles Disease

Subungual/Periungual Fibroma

Pringle Pringles Name Entire Disease Facial lesion only Mild Mental Retardation Seizures Hard Potatoes Tubular Can Tuberous Tuberous