1. M. LAADHARI, A. AISSA, M. KHERIFECH, I. MEZHOUD, K. BEN HELAL*, M. ALLANI, R. ALOUINI Medical Imaging Ibn El Jazzar Hospital Kairouan * Department of Pediatrics Ibn El Jazzar Hospital Kairouan Tunisia PAN ARAB 2012- PEDIATRICS : PD 9

2.  Vascular malformations are a spectrum of unknown injury interesting mainly the pediatric population  Venous malformations are the most common vascular malformations  In case of complex or atypical clinical presentation, the doppler ultrasound and MRI are the two noninvasive imaging techniques which are essential :  To achieve the positive diagnosis towards differential diagnosis  To make an assessment of local and regional expansion referred to pre-therapeutic and prognostic and monitor spontaneous or on treatment of injuries

3.  Illustrate a case of vascular malformation hemodynamically inactive venous type.  Demonstrate the role of different imaging means (standard X-ray, doppler ultrasound, cross-sectional imaging) in the diagnostic confirmation.

4.  A 12-year-old patient without a history disease, which was presented to the ED with a painful swelling of the forearm lasting for two days with a history of trauma two weeks ago.  Clinical examination: swelling of the medial surface soft, movable relative to the two planes, painful without cutaneous signs in regard.  An X-ray standard, a doppler ultrasound, a CT scan supplemented by an MRI were performed.

5. Soft tissue mass with round opacity tone calcium without adjacent bone changes.

6. Multiple structures tubulated, tortuous hypoechoic, heterogeneous, infiltrating the subcutaneous fat, compressible with multiple hyperechoic spots followed by posterior acoustic shadowing (phlebolites). No flow at color Doppler and pulse.

7. Lesion on the soft tissu, containing many heterogeneous hyperdense calcifications of varying size, with enhancement after injection discreet locations.

8. Training oval in the subcutaneous and muscular tissue composed of contiguous structures serpiginous franc hyperT2, isoT1 with intralesional structures in focal hypoT2 EG and T2 are compatible with phleboliths. Sequence -coronale -STIR-Sequence -coronale -FSE T1-

9. Sequence –axiale-FSE T1,FSET2 and T2* T1 T2 T2*

10. Precoce and moderate enhancement, heterogeneous and "clumps" after injection. Axial-FSE T1 Fatsat after Gadolinium Coronal-FSE T1 Fatsat after Gadolinium MIP

11. Coronal-FSE T1 Fatsat after Gadolinium

12.  Prerequisite: know the classification of superficial vascular abnormalities.  Many sources of terminological confusion misdiagnosis and inappropriate treatment.

13.  VASCULAR TUMORS : abnormal endothelial cell proliferation  Vascular Malformations : embryological vessel abnormalities without abnormal cell proliferation

14.  Infantile hemangioma: the most common tumor in infants  Congenital hemangiomas (RICH and NICH), kaposiform hemangioendothelioma, tufted angioma  Exeptionnel: hemangiopericytoma, fibrosarcoma, rhabdomyosarcoma infant …

15. Classified according to hemodynamic data (classification more relevant)  Slow flow malformations (hemodynamically inactive): capillary, venous,lymphatic, combination of these malformations  Fast flow malformations (hemodynamically active):  Those with a blood component  Fistula or arteriovenous malformation

17.  Congenital lesions  Present at birth  Always sometimes late clinical manifestation (until adolescence)  Lack of spontaneous regression, persistence throughout life with growth proportional to that of the child  Possible phases of thrust if trauma, infection, hormonal changes (puberty, pregnancy)

18.  Treatment usually necessary + + +  Treatment is conditioned by hemodynamic characteristics of the vascular malformations  Importance of the distinction between congenital malformations and slow flow to fast flow

19.  Place of imaging very limited  Superficial anomaly hardly visible on imaging (sometimes skin thickening and subcutaneous)  Search for underlying vascular malformation or associated anomalies (vascular syndromes) + + +

20.  Most common vascular malformation  Old "cavernous hemangioma" (confusing terminology)  Dysplastic veins: venous ectasia or true venous lakes (= cavities with vascular endothelial lining)  Often evident at birth  Often asymptomatic, sometimes painful if:  Thrust thrombosis secondary to intralesional or hormonal changes  Depth extension of the muscle  Joint damage Headquarters: head and neck region (40%), extremities (40%), trunk (20%)

21. Two categories : Heredatery veinous malformations Venous malformations common (our case)  The most common  Location : Cervicofacial + + and members  Often later onset  Usual complications: thrombosis in situ  always find a localized intravascular coagulation  Treatment only in cases of functional impairment or significant aesthetic

22. Members « Clinical presentation »  Possible with cutaneous, subcutaneous, muscle and joint  Pain due to thrombosis localized to gravity or nerve compression  In case of joint damage: recurrent effusions and hemorrhagic reaction with possible cartilage destruction (type hemophilic arthropathy)

23. « X-ray standard »  Mass of soft tissue  Non-specific but inconstant pathognomonic phleboliths (round opacities tone calcium)  Possible bone remodeling adjacent lesions extended

24. « Color and pulsed doppler ultrasound » Two types of venous malformations  Cavitary +++  Gaps  Phlebolite  Slow venous flow monophasic  No flow (16%): thrombosis or technical limitations (very slow flow below the detection flux) => to Valsalva maneuver  Component two-phase : flow capillary-associated (slow arterial flow)  Dysplasique  Multiple varicose dilatations  Multiple structures tubulées tortuous, anechoic, infiltrating the subcutaneous fat, muscle-tendon structures...  Slow venous flow

25. « CT scann »  Little use  More sensitive than plain radiography for detecting phleboliths  Detection of any fatty component and detection of bone underlying

26. « IRM » PRECONISED PROTOCOLE  Importance of T2 FS or STIR sequences + + +  SE T1 staging (anatomical balance), EG T2 (phleboliths, hemosiderin)  T1 FS gado (evaluation of perfusion)  3D dynamic MR angiography with injection  EG 3D T1 gadolinium bolus (2 ml / s) and subtraction  Dynamic MRI: evaluation of time between the onset of arterial enhancement and early enhancement of the lesion :  Early if <or = 6 s: component malformation with arterial or capillary  Late if> 6 s : pure venous malformation

27. « IRM » HABITUEL ASPECTS  Serpiginous structures, tubulated or multilocular masses in connection with venous lakes separated by septa  Isosignal or hypo-signal on T1, frank hyper-signal on T2.  More heterogeneous signal on T1 if bleeding or thrombosis.  Hypo-signal areas on T2 (phleboliths, thrombi, septa).  Hypointense on all sequences (phleboliths).  EG asignal on T2 (slow flow).  Progressive enhancement "patchy" or "clumps" of circulating areas.

28. « Per-cutanous phlebography »  Not useful for diagnosis  Stage 1 of treatment by sclerotherapy (in puncture of the malformation with needle 20-22 G)  Optimal evaluation of the anatomy of the MV and its venous drainage

29.  The superficial vascular abnormalities are a diagnostic and therapeutic challenge that must be based on a multidisciplinary approach.  Their diagnosis is based primarily on clinical examination.  Vascular malformations are usually present at birth and do not regress spontaneously.

30.  Venous malformations are the most common vascular malformations and arteriovenous malformations are vascular malformations, the most dangerous, with unpredictable and difficult to treat.  It is important to distinguish between slow flow vascular malformations (capillary, venous, lymphatic) and vascular malformations fast flow (arteriovenous) that fall under different therapeutic management  Interest of 3D MR angiography with dynamic gadolinium- enhanced and high temporal resolution (5 s).