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2 Babies Hand Imaging andX-ray
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Fig. 2.21 Post contrast gadolinium T1 sequence coronal and sagittal: rapid omogenous capillar enhancement of the
lesion
23
ab c
Fig. 2.22 MRI of a venolymphatic malformation. T2 fat
sat sequence with MIP reconstruction shows a reticular
micronodular pattern with hyperintensity in subcutaneous
tive to MRI for patients who can’t withstand
sedation and thus need a faster exam. Furthermore,
CT scan is indicated in the follow-up of extremely
bulky AVM, which have been previously treated
through embolization with spiral or metallic
clips—as these materials determine relevant artefacts in MR images.
Currently, digital angiography is no more
indicated as the diagnostic exam for studying the
exact architecture and haemodynamics of CVM,
the research of arterial afferent pedunculi, nidi
and venous efferences—as all these elements are
well displayed in MRI.Digital angiography has
fat (a), T1 weight (b), T1 post mdc (c) absence of enhancement into the malformation
instead a therapeutic indication for voluminous
AVM and other lesions that can be successfully
treated through endovascular embolization.
2.4 Tumours, Post-traumatic or
Post-surgical Inammatory
andInfectious Diseases
Diagnostic imaging of tumours is directly related
to the lesion onset location.
Hand neoplastic lesions include: benign bone
tumours (chondroma, aneurismatic bone cyst and

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G. A. Rispoli and M. Zompatori
solitary cyst), malign bone tumours (osteochondroma, Ewing tumours, etc.) and soft tissue neoplasm (rhabdomyosarcoma, synovial-sarcoma, etc.).
The diagnostic pathway in bone neoplastic
lesions starts with a conventional X-ray exam in
standard projections (Fig.2.23a) and needs to be
completed by MRI with contrast medium injection (Fig.2.24). This is the diagnostic gold standard, as it allows a simultaneous evaluation of
bone and surrounding soft tissues, as long as the
exact extension, necessary for the preoperative
planning.
The only real MRI limitation is the poor accuracy in the evaluation of bone erosion and cortex
interruption, as they do not change in T1 and
T2-weighted sequences. In this case, CT scan
provides a greater accuracy, to study the bone
structure (Figs. 2.23b and 2.24), identify small
early lesions and evaluate the healing process and
remodelling after the treatment. For all these
advantages, the patients must still be exposed to a
signicant dose of radiation.
All benign and malign expansive lesions that
originate from soft tissues are well visualized in
US investigations: a simple, cost-effective,
repeatable exam that, in expert hands, has high
sensibility and accuracy.
US exams easily identify the solid or uid
nature of a lesion: thus allowing to diagnose
benign lesions (lipoma, haemangioma and cyst),
that have well-known characteristics, without the
need of second-line investigations.
By using high-frequency probes and colour
Doppler US in association with B-mode evaluation, a rst differentiation between benign and
malign lesions can guide the diagnostic pathway
(Fig.2.25).
However, when ultrasonography is not sufcient to provide a diagnostic certainty or the
lesion is bulky and thus not entirely visible with a
US probe, MRI, with and without contrast
medium, is indicated, for an evaluation of local
extension and spatial relationship with contiguous structures.
ab
Fig. 2.23 Enchondroma V nger: (a) litic expansive lesion without cortical erosion in RX; (b) CT scan—MPR recon-
struction—high resolution imaging for the study of bone and cortical structure

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Fig. 2.24 MRI
enchondroma V
nger—T1 and T2
weight sequence
25
Fig. 2.25 US B-mode and colour Doppler in nodular mass III nger: Giant cell tumor of tendon sheath
In soft tissue neoplasms, follow-up MRI has a
primary role, as it provides the greatest reliability
in recognizing small nodular recurrences against
a background of post-therapeutic inammatory
tissue (Fig.2.26).
In soft tissue neoplasms, rather than for morphological characteristics and spatial location,
CT scan is used for disease staging: research of
distant metastasis, primarily to the lungs. It is
therefore indicated in certain oncologic
protocols.
Hand inammatory diseases are frequent in
pediatric patients. They can be primary (rheuma-
tologic diseases) or secondary (post-traumatic or
post-surgery); these lesions can involve supercial tissues (inammation and peri-cicatricial
abscesses) as well as deep structures, such as
joints (synovial membrane, articular capsule, tendons, retinacula, etc.).
In all these cases US is once more the rst-line
exam.
In acute primary inammatory disease, without involvement of joints and periarticular structures, US high frequency probes allow to
visualize joint effusion, synovial hypertrophy
and diffusion of the inammatory process to

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G. A. Rispoli and M. Zompatori
Fig. 2.26 MRI—expansive and inltrating mass around I
nger (Rabdomiosarcoma): T1 pre (coronal) e post (axial)
gadolinium: aggressive tissue with inltration of the bone
contiguous tendon structures (tenosynovitis and
peri-tendinitis).
In chronic affections (such as in juvenile
rheumatoid arthritis), US evaluates the evolution of erosions, cortex irregularities, synovial
hyperplasia, calcications and bone neo-apposition or reabsorption. Furthermore, in these
patients, power Doppler (i.e. capable of detecting very low ow in hyperaemic areas) can
assure a follow-up of the activity of rheumatological diseases.
In these patients, there is rarely necessary a
second-line investigation, but when there is, MRI
is the choice. This expensive and hardly tolerated
method is reserved to those joints which are not
entirely evaluable by US (coxo-femoral joint,
vertebral joints, etc.).
Finally, US is an optimal method for studying
the post-traumatic (open wound, compound fracture) and post-surgical complications: subcutaneous panniculus adiposus and its morphologic
variations, as well as differentiation between
lymphoedema and panniculitis, thanks to colour
and power Doppler (panniculitis is highly hyper-
and contiguous muscles with high and inhomogeneous
enhancement
aemic); supercial extension and joint diffusion
of inammation. This allows a prompt patient
orientation to the best therapy, so to assure the
success of treatments.
Moreover, US is the exam of choice for the
study of post-traumatic or post-surgical abscesses.
US identies location, margins, characteristics
(uid, with particulate matter; infectious or notinfectious nature according to colour Doppler
examination of parietal hyperaemia) and possible
presence of gas—that limits US reliability.
When inammatory processes and collections
are widely extended, involving surrounding bone
structures that are not well evaluated by US
method, MRI is indicated. In these cases,
T2-weighted sequences with great uid resolution can provide a complete evaluation of location and extension of the abscess, as well as of
the involvement of contiguous bone structures. If
bone is affected by the inammatory process, it
will show high signal intensity on T2-weighted
images, so that a prompt therapeutic intervention
may avoid osteomyelitis and other severe
consequences.

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Further Reading
Ballah D, Cahill AM, Fontalvo L, Yan A, etal. Vascular
anomalies: what they are, how to diagnose them,
and how to treat them. Curr Probl Diagn Radiol.
2011;40(6):233–47.
Battle J, Carmichael K.Incidence of pin track infections
in children’s fractures treated with Kirschner wire
xation. J Pediatr Orthop. 2007;27:154–7.
Brandon C, Caoili EM, Feng FY, Girish G, Jacobson JA,
Wang G. Sonography of wrist ganglion cysts: variable and non-cystic appearances. J Ultrasound Med.
2006;26(10):1323–8.
Brisse H, Orbach D, Klijanienko J, Fréneaux P,
Neuenschwander S. Imaging and diagnostic strategy of soft tissue tumors in children. Eur Radiol.
2006;16:1147–64.
Cardinal E, Bureau N, Aubin B.Role of the ultrasound
in musculoskeletal infections. Radiol Clin N Am.
2001;39:191–201.
Cerezal L, del Piñal F, Abascal F, García-Valtuille
R, Pereda T, Canga A. Imaging ndings in ulnarsided wrist impaction syndromes. Radiographics.
2002;22(1):105–21.
Chang GH, Paz DA, Dwek JR, Chung CB.Lower extrem-
ity overuse injuries in pediatric athletes: clinical
presentation, imaging ndings, and treatment. Clin
Imaging. 2013;37:836–46.
Curtis DJ, Downey EF Jr, Brower AC, Cruess DF,
Herrington WT, Ghaed N. Importance of soft-tissue
evaluation in hand and wrist trauma: statistical evaluation. AJR Am J Roentgenol. 1984;142(4):781–8.
Davis KW. Imaging pediatric sports injuries: upper
extremity. Radiol Clin N Am. 2010;48(6):1199–211.
Donnelly LF, Adams DM, Bisset GS 3rd. Vascular mal-
formations and hemangiomas: a practical approach
in a multidisciplinary clinic. AJR Am J Roentgenol.
2000;174(3):597–608.
Dubois J, Alison M.Vascular anomalies: what a radiologist
needs to know. Pediatr Radiol. 2010;40(6):895–905.
Dubois J, Patriquin HB, Garel L, etal. Soft-tissue hem-
angiomas in infants and children: diagnosis using
Doppler sonography. AJR. 1998;171:247–52.
Dwek JR. The periosteum: what is it, where is it,
and what mimics it in its absence? Skelet Radiol.
2010;39(4):319–23.
Dwek JR, Cardoso F, Chung CB. MR imaging of over-
use injuries in the skeletally immature gymnast: spectrum of soft-tissue and osseous lesions in the hand and
wrist. Pediatr Radiol. 2009;39(12):1310–6.
Ecklund K, Jaramillo D. Patterns of premature phy-
seal arrest: MR imaging of 111 children. AJR Am J
Roentgenol. 2002;178(4):967–72.
Egol K, Koval KJ, Zuckerman JD. Handbook of frac-
tures. 4th ed. Philadelphia, PA: Lippincott Williams &
Wilkins; 2010. p.660–80.
Flors L, Leiva-Salinas C, Maged IM, Norton PT, et al.
MR imaging of soft-tissue vascular malformations:
diagnosis, classication, and therapy follow-up.
Radiographics. 2011;31(5):1321–40.
Fuller DJ, McCullough CJ. Malunited fractures of
the forearm in children. J Bone Joint Surg Br.
1982;64(3):364–7.
Greulich WW, Pyle S. Radiographic atlas of skeletal
development of the hand and wrist. 2nd ed. Stanford,
Calif: Stanford University Press; 1959.
Jaimes C, Chauvin NA, Delgado J, Jaramillo D.MR imag-
ing of normal epiphyseal development and common
epiphyseal disorders. Radiographics. 2014;34:449–71.
Johari AN, Sinha M.Remodeling of forearm fractures in
children. J Pediatr Orthop B. 1999;8(2):84–7.
Johnson KJ, Haigh SF, Symonds KE. MRI in the man-
agement of scaphoid fractures in skeletally immature
patients. Pediatr Radiol. 2000;30:685–8.
Kaawach W, Ecklund K, Di Canzio J, Zurakowski D,
Waters PM. Normal ranges of scapholunate dis-
tance in children 6 to 14 years old. J Pediatr Orthop.
2001;21(4):464–7.
Kaiser S, Rosenborg M.Early detection of subperiosteal
abscesses by ultrasonography: a means for further suc-
cessful treatment in pediatric osteomyelitis. Pediatr
Radiol. 1994;24:336–9.
Kannikeswaran N, Sethuraman U.Lunate and perilunate
dislocations. Pediatr Emerg Care. 2010;26(12):921–4.
Kaste SC, Hill A, Conley L, Shidler TJ, Rao BN, Neel
MM. Magnetic resonance imaging after incomplete
resection of soft tissue sarcoma. Clin Orthop Relat
Res. 2002;397:204–11.
Legiehn GM, Heran MK. Venous malformations: clas-
sication, development, diagnosis, and interventional
radiologic management. Radiol Clin N Am.
2008;46(3):545–97.
Lurie B, Koff MF, Shah P, etal. Three-dimensional mag-
netic resonance imaging of physeal injury: reliability
and clinical utility. J Pediatr Orthop. 2014;34:239–45.
Mahnken AH, Bücker A, Adam G, Günther RW. MRI
of osteomyelitis: sensitivity and specicity of STIR
sequences in comparison with contrast-enhanced T1
spin echo sequences. Rofo. 2000;172:1016–9.
Narváez JA, Narváez J, Aguilera C, De Lama E, Portabella
F. MR imaging of synovial tumors and tumor-like
lesions. Eur Radiol. 2001;11(12):2549–60.
Navarro OM, Laffan EE, Ngan BY. Pediatric soft-tissue
tumors and pseudo-tumors: MR imaging features with
pathologic correlation: part 1. Imaging approach, pseu-
dotumors, vascular lesions, and …. Radiographics.
2009;29(3):887–906.
Paltiel HJ, Burrows PE, Kozakewich HP, et al. Soft-
tissue vascular anomalies: utility of US for diagnosis.
Radiology. 2000;214:747–54.
Patil P, Dasgupta B. Role of diagnostic ultrasound in the
assessment of musculoskeletal diseases. Ther Adv
Musculoskelet Dis. 2012;4(5):341–55.
Pineda C, Espinosa R, Pena A. Radiographic imaging
in osteomyelitis: the role of plain radiography, com-
puted tomography, ultrasonography, magnetic reso-
nance imaging, and scintigraphy. Semin Plast Surg.
2009;23:80–9.

28
https://t.me/medicina_free
G. A. Rispoli and M. Zompatori
Sanchez TR, Jadhav SP, Swischuk LE. MR imaging of
pediatric trauma. Magn Reson Imag Clin North Am.
2009;17:439–50.
Shi DP, Zhu SC, Li Y, Zheng J. Epiphyseal and phy-
seal injury: comparison of conventional radiography
and magnetic resonance imaging. Clin Imaging.
2009;33(5):379–83.
Siegel MJ. Magnetic resonance imaging of muscu-
loskeletal soft tissue masses. Radiol Clin N Am.
2001;39:701–20.
Teefey SA, Dahiya N, Middleton WD, Gelberman RH,
Boyer MI.Ganglia of the hand and wrist: a sonographic
analysis. AJR Am J Roentgenol. 2008;191(3):716–20.
Tibrewal S, Jayakumar P, Vaidya S, Ang SC.Role of MRI
in the diagnosis and management of patients with clin-
ical scaphoid fracture. Int Orthop. 2012;36(1):107–10.
Trevor W, Oren M, Jennifer M, Wolf MD. Soft-tissue
complications associated with distal radius fractures.
Oper Tech Orthop. 2009:100–6.
Tsai TS, Evans HA, Donnelly LF, Bisset GS 3rd, Emery
KH. Fat necrosis after trauma: a benign cause of
palpable lumps in children. AJR Am J Roentgenol.
1997;169:1623–6.

Hand Defects: AnIsolated
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Anomaly Or a Syndromic Disease?
AngeloSelicorni, PaolaCianci, SilviaTajè,
andMassimoAgosti
3
Abstract
Patients with hand congenital defects are a
very heterogeneous cohort. Like for any other
major malformation, one of the goals of the
clinical approach is to dene if the anomaly is
an isolated problem or if it’s part of a more
complex genetic disease. This denition
sometimes it’s not so easy, but it’s crucial in
order to dene a correct prognosis for the
child and a proper genetic counseling for parents, for their relatives and, in the future, for
the patient itself. Tor achieves the aforementioned result, it’s important to follow a specic
methodologic approach that starts from a
detailed clinical analysis of the patient and
that can properly use the known genetic tests.
In this eld in recent years, new very powerful
tests have become available (array CGH and
NGS) greatly increasing the possibility of a
correct framing also in front of very complex
children, and so saving time and money.
A. Selicorni (*) · P. Cianci · S. Tajè
Pediatric Department, Mariani Foundation Center for
Fragile Child, “Sant’Anna” Hospital, ASST Lariana,
Como, Italy
M. Agosti
Pediatric Department, “F. Del Ponte” Hospital, ASST
Settelaghi, University of Insubria, Varese, Italy
Keywords
Major malformations · Hand anomalies ·
Syndromic diseases · Apert syndrome ·
Pfeiffer syndrome · Saethre–Chotzen
syndrome · Crouzon syndrome · Freeman–
Sheldon syndrome · Oro-facio-digital
syndromes · EEC syndrome · Array CGH ·
Next Generation Sequencing (NGS)
3.1 Denitions
Like in other parts of the body, the hands can be
an area in which different kind of congenital
anomalies can be evident. Generally speaking,
we can distinguish these defects into two different types. We can in fact observe major malfor-
mations that are congenital anomalies with
relevant medical consequences (e.g., the loss of a
thumb, the presence of a supernumerary nger,
etc.) and which frequently deserve a surgical
approach; or minor anomalies that refes to
defects with no or very minimal clinical impact
which can have only aesthetic consequences
(e.g., a mild skin syndactyly or a clinodactyly of
the fth nger) [1]. These defects are due to an
intrinsic embryological abnormal process. We
know that organogenesis takes place during the
rst 10weeks of gestation, so that these anomalies develop in the embryo only during that range
of time.
© Springer Nature Switzerland AG 2023
G. Pajardi (ed.), Pediatric Hand Surgery, https://doi.org/10.1007/978-3-031-30984-7_3
29

30
Different combination of these possible areas of involvement
Specific genetic defect
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Fig. 3.1 Clinical
features of a syndrome
A. Selicorni et al.
-Abnormal growth pattern ( both poor or increased)
-Presence of major malformations ( considering both the classical and the
occasional one)
-Abnormal psychomotor development
-Peculiar minor anomalies (especially but not exclusively related to facial
gestalt)
Sometimes interpretation of these signals is
not so easy. The example can be the evidence of a
post-minimum skin appendix on the ulnar side of
the hand. This little anomaly has no meaningful
medical consequences but it’s a very mild expression of a postaxial polydactyly which is a true
major malformation.
Again together with malformations, a hand
anomaly could also be the result of deformation.
We dene deformation as those congenital
defects which are not related to an embryonal
abnormal developmental process but that arise
after a normal embryogenesis due to a damage to
normally developed structures. The classic example of deformation is the consequences of amniotic band disruption process in which we can
observe lesion at the hands/ngers of various
severity, very often asymmetrical in clinical presentation between different ngers and different
hands.
Similarly to every kind of congenital defects,
also hand anomalies can be isolated or part of a
broader disease named syndrome. In 2005,
Biesecker discussing this point related to polydactyly stated that “… the problem of non syndromic polydactyly is formally insoluble…. So
we dene “syndrome” a clinical condition in
which a child can have various medical/functional problems which are due to a single genetic
anomaly”. Figure3.1 denes the areas of involvement of a syndrome [2]. A classical example is
represented by Apert syndrome: a very common
pattern of craniofacial anomalies is associated
with an absolutely typical and severe syndactyly
pattern of hands and feet, with possible associated anomalies in growth, psychomotor development; all these features are due to a specic
mutation in FGFR2 gene.
3.2 Why aProper Classication
ofHand Malformations Is
SoImportant?
The relevant question is what are the consequences of a correct classication of a hand congenital defect as isolated or syndromic. Table3.1
analyzes the situation. It’s obvious that in case
the child is affected by a genetic syndrome, his
prognosis, in the great majority of the situation, is
more deeply inuenced by the natural history of
the syndrome itself, rather than by the specic
functional prognosis of the hand defect. Survival,
physical growth, psychomotor and intellectual
development can be more or less severely conditioned by the natural evolution of the disease.
The frequency, needs and type of medical followup can be extremely different in the two situations (isolated or syndromic defect) and the hand
defect can often represent a minor problem to
face in comparison with the others in a syndromic
setting. Finally, the recurrence risk of the usually
healthy parents and of the child himself as soon
as he/she will be an adult will be very different
according to the classication of the defect as
isolated or syndromic.

3 Hand Defects: AnIsolated Anomaly Or a Syndromic Disease?
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31
Table 3.1 Consequences of a correct classication of a
congenital hand anomalies
Isolated defect Syndromic defect
General health
prognosis
Survival Normal Potentially
Growth pattern Normal Potentially
Psychomotor
and intellectual
development
Follow-up
needs
Functional
prognosis of
the hand
malformation
Recurrence
risk for parents
Recurrence
risk for the
child
a
Related to the natural history of the syndrome
b
Related to the genetic basis of the syndrome
Usually
favorable
Normal Potentially
Only related to
the hand
malformation
Only related to
the type of
malformation
and the
possibility of
surgical
correction
Usually low
(apart from
specic
monogenic
isolated
condition)
Usually low
(apart from
specic
monogenic
isolated
condition)
Potentially critical
abnormal
abnormal
abnormal
Often need for a
wider
multidisciplinary
approach
Strongly inuenced
also by the general
functional
prognosis of the
syndrome
Potentially
increased
Potentially
increased
a
a
a
a
b
b
a
3.3 The Clinical-Genetic
Diagnostic Process
The classication of a defect as isolated or syndromic could not be so easy and quick. Usually
hand anomalies are diagnosed at birth, even if
sometimes the ultrasound studies during pregnancy could have generated some doubts. It’s
important to state that a complete evaluation of
the phenotype is possible only after birth; for this
reason, prenatal counseling should always be
very cautious because surprises are frequent.
In the neonatal period, we can have different
scenarios. In some situations, the clinical data are
already clear and absolutely convincing toward a
syndromic condition. This is the case in which
the newborn shows multiple congenital defects,
clear dysmorphic features, abnormal birth auxological parameters, and/or abnormal neurologic
status. In these cases, the question is whether it’s
possible to perform a “gestaltic diagnosis” or not.
More often the hand anomaly seems at rst
glance to be an isolated problem. In this context,
it’s important to perform a proper clinical and
instrumental evaluation, in order to search for
possible associated major malformations, functional defects (e.g., audiological or visual deciency), and dysmorphic minor anomalies.
Family and pregnancy history is essential too in
order to better classify the problem. It’s well
known the existence of an isolated hand defects
which can have a mendelian segregation mostly
according to autosomal dominant inheritance
(e.g., pre- and postaxial polydactyly, triphalangeal thumb, and ectrodactyly). In addition, some
genetic syndromes (like Pfeiffer syndrome, for
example) have a dominant transmission too. It’s
always important to consider that in some situations the variability of expression of the disease
and the absence of intellectual involvement can
have prevented the recognition of the disease in a
relative. For all these reasons, a three generations
genealogic tree should always be performed and
direct parents’ evaluation could be useful, in
order to deeply evaluate possible familiar pathological traits that can be crucial for the classication of the proband’s defect.
If no associated anomalies are evident, it can
be reassuring for the clinicians, but it must be
kept in mind that the hypothesis of a syndromic
condition needs to be conrmed by the evolution
of the child. So a proper pediatric-genetic followup is strongly recommended in order to conrm
the classication of the hand defect as isolated.
Growth and developmental data and somatic and
medical evolution are paramount in order to
dene the situation [2, 3].
As we have said before, sometimes the diagnosis could be made quite easily in the neonatal
period, if the clinical data are enough expressed
and the experience of the clinician related to that
condition is high. Table 3.2 summarized some
examples of syndromes that can be diagnosed at

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Table 3.2 Possible gestaltic neonatal syndromic diagnosis
Syndrome Hand defect Associated anomalies Genetic defect
Apert
syndrome
Cornelia de
Lange
syndrome
VATER
association
Rubinstein–
Taybi
syndrome
Freeman–
Sheldon
syndrome
Holt–Oram
syndrome
Meckel–
Gruber
syndrome
Fanconi
anemia
Complete
syndactyly
Limb reduction
defects, missing
ngers of ulnar
side
Radial ray defect Vertebral anomaly imperforate
Large/bid
thumbs/hallux
Hand contractures, Whistling face, other joints
Monolateral radial
ray defect
Postaxial
polydactyly
Radial ray
deciency
Craniostenosis dysmorphisms,
possible growth and
developmental anomalies
Peculiar dysmorphisms,
hirsutism pre- and postnatal
growth retardation, psychomotor
retardation, intellectual
disability
anus, esophageal athresia,
trachea esophageal stula, heart
anomaly
Peculiar dysmorphisms,
psychomotor delay, growth
retardation
contractures (as in patient with
distal arthrogryposis)
Heart congenital defects, ECG
anomalies
Cystic renal disease, occipital
encephalocele
Multiple congenital defects,
increased risks to develop
hematologic and nonhematologic neoplasia, bone
marrow insufciency
Autosomal dominant FGFR2 mutation
Mutation in different gene of the cohesion
family (NIPBL, SMC1A, SMC3, RAD 21,
HDAC8, ANJRD11, BRD4) most genes
follow an autosomal dominant inheritance,
some others X linked inheritance
Unknown
Microdeletion 16p13.3, autosomal dominant
CREBP or EP300 gene mutation
Autosomal dominant MYH3 gene mutation
Autosomal dominant TBX3 gene mutation
Four different subtypes involving different
genes with autosomal recessive inheritance
Heterogeneous disease with 19 genes
involved with autosomal recessive
inheritance
Karyotype with DEB showing increased
chromosome fragility
A. Selicorni et al.
birth in front of a hand anomaly. In these situations, nowadays the clinical hypothesis can frequently be conrmed by specic genetic tests.
Later the use and the limits of the genetic tests
will be discussed more in to details.
3.4 Main Syndromic Conditions
Associated withHand
Anomalies
The number of syndromes associated with hand
anomalies, also limiting the discussion to major
hand malformations, is extremely wide, so a
detailed discussion is impossible to be performed
in a short chapter. So we will briey discuss some
malformative/genetic conditions that must be
known because of their frequency and clinical
relevance.
3.4.1 Amniotic Band Sequence
Amniotic band sequence is a congenital limb disorder with an extremely variable clinical presentation. Its frequency is about 1in 1200 live births.
It is characterized by the presence of partial to
complete, congenital, brous, circumferential,
constriction bands/rings on any part of the body,
with a particular predilection for the upper or
lower extremities. Phenotypes range between a
mild skin indentation to complete amputation of
parts of the fetus (e.g. digits, distal limb); fusion
of digits mimicking syndactyly can also be evident. Classically, the damage of the extremities is
asymmetrical between different digits and different hands. This feature and constriction rings are
the clues of the clinical diagnosis. The commonly
accepted view is that amniotic band sequence
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