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Lymphatic malformation 6(LMPHM6)

MedGen UID:
908120
Concept ID:
C4225184
Disease or Syndrome
Synonyms: GENERALIZED LYMPHATIC DYSPLASIA OF FOTIOU; LMPHM6; Lymphedema, hereditary, III
SNOMED CT: Piezo type mechanosensitive ion channel component 1-related generalized lymphatic dysplasia with non-immune hydrops fetalis (1222667006); PIEZO1-related generalized lymphatic dysplasia with non-immune hydrops fetalis (1222667006); PIEZO1-related generalized lymphatic dysplasia with systemic involvement (1222667006); Generalized lymphatic dysplasia of Fotiou (1222667006); PIEZO1-related lymphatic-related hydrops fetalis (1222667006)
 
Gene (location): PIEZO1 (16q24.3)
 
Monarch Initiative: MONDO:0014797
OMIM®: 616843

Definition

Lymphatic malformation-6 is a form of generalized lymphatic dysplasia (GLD), which is characterized by a uniform, widespread lymphedema affecting all segments of the body, with systemic involvement such as intestinal and/or pulmonary lymphangiectasia, pleural effusions, chylothoraces and/or pericardial effusions. In LMPHM6, there is a high incidence of nonimmune hydrops fetalis (NIHF) with either death or complete resolution of the neonatal edema, but childhood onset of lymphedema with or without systemic involvement also occurs. Mild facial edema is often present. Patients have normal intelligence and no seizures (summary by Fotiou et al., 2015). For a discussion of genetic heterogeneity of lymphatic malformation, see 153100. [from OMIM]

Clinical features

From HPO
Hydrocele testis
MedGen UID:
318568
Concept ID:
C1720771
Congenital Abnormality
Accumulation of clear fluid in the between the layers of membrane (tunica vaginalis) surrounding the testis.
Atrial septal defect
MedGen UID:
6753
Concept ID:
C0018817
Congenital Abnormality
Atrial septal defect (ASD) is a congenital abnormality of the interatrial septum that enables blood flow between the left and right atria via the interatrial septum.
Varicose disease
MedGen UID:
21827
Concept ID:
C0042345
Disease or Syndrome
Enlarged and tortuous veins.
Short stature
MedGen UID:
87607
Concept ID:
C0349588
Finding
A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to "short stature" as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms).
Ascites
MedGen UID:
416
Concept ID:
C0003962
Disease or Syndrome
Accumulation of fluid in the peritoneal cavity.
Prune belly syndrome
MedGen UID:
18718
Concept ID:
C0033770
Disease or Syndrome
In its rare complete form, 'prune belly' syndrome (PBS) comprises megacystis (massively enlarged bladder) with disorganized detrusor muscle, cryptorchidism, and thin abdominal musculature with overlying lax skin (summary by Weber et al., 2011).
Gastroesophageal reflux
MedGen UID:
1368658
Concept ID:
C4317146
Finding
A condition in which the stomach contents leak backwards from the stomach into the esophagus through the lower esophageal sphincter.
Abnormal pinna morphology
MedGen UID:
167800
Concept ID:
C0857379
Congenital Abnormality
An abnormality of the pinna, which is also referred to as the auricle or external ear.
Hearing impairment
MedGen UID:
235586
Concept ID:
C1384666
Disease or Syndrome
A decreased magnitude of the sensory perception of sound.
Cupped ear
MedGen UID:
335186
Concept ID:
C1845447
Congenital Abnormality
Laterally protruding ear that lacks antihelical folding (including absence of inferior and superior crura).
Global developmental delay
MedGen UID:
107838
Concept ID:
C0557874
Finding
A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.
Deep venous thrombosis
MedGen UID:
57448
Concept ID:
C0149871
Disease or Syndrome
Formation of a blot clot in a deep vein. The clot often blocks blood flow, causing swelling and pain. The deep veins of the leg are most often affected.
Cellulitis
MedGen UID:
40174
Concept ID:
C0007642
Disease or Syndrome
A bacterial infection and inflammation of the skin und subcutaneous tissues.
Micrognathia
MedGen UID:
44428
Concept ID:
C0025990
Congenital Abnormality
Developmental hypoplasia of the mandible.
Scoliosis
MedGen UID:
11348
Concept ID:
C0036439
Disease or Syndrome
The presence of an abnormal lateral curvature of the spine.
Pectus excavatum
MedGen UID:
781174
Concept ID:
C2051831
Finding
A defect of the chest wall characterized by a depression of the sternum, giving the chest ("pectus") a caved-in ("excavatum") appearance.
Chylothorax
MedGen UID:
40305
Concept ID:
C0008733
Disease or Syndrome
Accumulation of excessive amounts of lymphatic fluid (chyle) in the pleural cavity.
Pleural effusion
MedGen UID:
10805
Concept ID:
C0032227
Disease or Syndrome
The presence of an excessive amount of fluid in the pleural cavity.
Intestinal lymphangiectasia
MedGen UID:
9828
Concept ID:
C0024215
Disease or Syndrome
Angiectasia of lymph vessels (i.e., dilatation of lymphatic vessels) in the intestines.
Splenomegaly
MedGen UID:
52469
Concept ID:
C0038002
Finding
Abnormal increased size of the spleen.
Edema
MedGen UID:
4451
Concept ID:
C0013604
Pathologic Function
An abnormal accumulation of fluid beneath the skin, or in one or more cavities of the body.
Lymphedema
MedGen UID:
6155
Concept ID:
C0024236
Disease or Syndrome
Localized fluid retention and tissue swelling caused by a compromised lymphatic system.
Genital edema
MedGen UID:
101795
Concept ID:
C0151604
Pathologic Function
A buildup of fluid that causes swelling in the soft tissues of the genital area.
Generalized edema
MedGen UID:
376817
Concept ID:
C1850534
Pathologic Function
Generalized abnormal accumulation of fluid beneath the skin, or in one or more cavities of the body.
Periorbital edema
MedGen UID:
56223
Concept ID:
C0151205
Pathologic Function
Edema affecting the region situated around the orbit of the eye.
Webbed neck
MedGen UID:
113154
Concept ID:
C0221217
Congenital Abnormality
Pterygium colli is a congenital skin fold that runs along the sides of the neck down to the shoulders. It involves an ectopic fibrotic facial band superficial to the trapezius muscle. Excess hair-bearing skin is also present and extends down the cervical region well beyond the normal hairline.
Facial edema
MedGen UID:
154241
Concept ID:
C0542571
Pathologic Function
Swelling due to an excessive accumulation of fluid in facial tissues.
Epicanthus
MedGen UID:
151862
Concept ID:
C0678230
Congenital Abnormality
Epicanthus is a condition in which a fold of skin stretches from the upper to the lower eyelid, partially covering the inner canthus. Usher (1935) noted that epicanthus is a normal finding in the fetus of all races. Epicanthus also occurs in association with hereditary ptosis (110100).
Polyhydramnios
MedGen UID:
6936
Concept ID:
C0020224
Pathologic Function
The presence of excess amniotic fluid in the uterus during pregnancy.
Non-immune hydrops fetalis
MedGen UID:
105327
Concept ID:
C0455988
Disease or Syndrome
Hydrops fetalis is a descriptive term for generalized edema of the fetus, with fluid accumulation in extravascular components and body cavities. It is not a diagnosis in itself, but a symptom and end-stage result of a wide variety of disorders. In the case of immune hydrops fetalis, a frequent cause is maternofetal incompatibility as in that related to a number of genetic anemias and metabolic disorders expressed in the fetus; in other instances, it remains idiopathic and likely multifactorial (summary by Bellini et al., 2009). Nonimmune hydrops fetalis accounts for 76 to 87% of all described cases of hydrops fetalis (Bellini et al., 2009). Genetic Heterogeneity of Hydrops Fetalis In southeast Asia, alpha-thalassemia (604131) is the most common cause of hydrops fetalis, accounting for 60 to 90% of cases. Almost all of these cases result from homozygous deletion of the HBA1 (141800) and HBA2 (141850) genes. A few cases have been reported that had 1 apparently normal alpha-globin gene, termed the hemoglobin H (613978) hydrops fetalis syndrome (summary by Chui and Waye, 1998). Other genetic disorders predisposing to NIHF include other congenital anemias, such as erythropoietic porphyria (e.g., 606938.0013), and many metabolic disorders, such as one form of Gaucher disease (e.g., 606463.0009), infantile sialic acid storage disease (269920), mucopolysaccharidosis type VII (253220), glycogen storage disease IV (232500), congenital disorder of glycosylation type Ia (212065), and disorders of lymphatic malformation (see, e.g., LMPHM1, 153100).
Hypothyroidism
MedGen UID:
6991
Concept ID:
C0020676
Disease or Syndrome
Deficiency of thyroid hormone.

Professional guidelines

PubMed

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J Vet Intern Med 2024 Jan-Feb;38(1):145-151. Epub 2023 Dec 1 doi: 10.1111/jvim.16966. PMID: 38038236Free PMC Article
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Gastroenterology 2020 Feb;158(3):760-769. Epub 2019 Nov 12 doi: 10.1053/j.gastro.2019.09.051. PMID: 31730766

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