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Xu, R. Milroy Disease. Encyclopedia. Available online: (accessed on 08 December 2023).
Xu R. Milroy Disease. Encyclopedia. Available at: Accessed December 08, 2023.
Xu, Rita. "Milroy Disease" Encyclopedia, (accessed December 08, 2023).
Xu, R.(2020, December 23). Milroy Disease. In Encyclopedia.
Xu, Rita. "Milroy Disease." Encyclopedia. Web. 23 December, 2020.
Milroy Disease

Milroy disease is a condition that affects the normal function of the lymphatic system.

genetic conditions

1. Introduction

The lymphatic system produces and transports fluids and immune cells throughout the body. Impaired transport with accumulation of lymph fluid can cause swelling (lymphedema). Individuals with Milroy disease typically have lymphedema in their lower legs and feet at birth or develop it in infancy. The lymphedema typically occurs on both sides of the body and may worsen over time.

Milroy disease is associated with other features in addition to lymphedema. Males with Milroy disease are sometimes born with an accumulation of fluid in the scrotum (hydrocele). Males and females may have upslanting toenails, deep creases in the toes, wart-like growths (papillomas), and prominent leg veins. Some individuals develop non-contagious skin infections called cellulitis that can damage the thin tubes that carry lymph fluid (lymphatic vessels). Episodes of cellulitis can cause further swelling in the lower limbs.

2. Frequency

Milroy disease is a rare disorder; its incidence is unknown.

3. Causes

Mutations in the FLT4 gene cause some cases of Milroy disease. The FLT4 gene provides instructions for producing a protein called vascular endothelial growth factor receptor 3 (VEGFR-3), which regulates the development and maintenance of the lymphatic system. Mutations in the FLT4 gene interfere with the growth, movement, and survival of cells that line the lymphatic vessels (lymphatic endothelial cells). These mutations lead to the development of small or absent lymphatic vessels. If lymph fluid is not properly transported, it builds up in the body's tissues and causes lymphedema. It is not known how mutations in the FLT4 gene lead to the other features of this disorder.

Many individuals with Milroy disease do not have a mutation in the FLT4 gene. In these individuals, the cause of the disorder is unknown.

4. Inheritance

Milroy disease is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In many cases, an affected person inherits the mutation from one affected parent. Other cases may result from new mutations in the FLT4 gene. These cases occur in people with no history of the disorder in their family. About 10 percent to 15 percent of people with a mutation in the FLT4 gene do not develop the features of Milroy disease.

5. Other Names for This Condition

  • congenital familial lymphedema
  • hereditary lymphedema type I
  • Milroy's disease
  • Nonne-Milroy lymphedema


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  2. Brice GW, Mansour S, Ostergaard P, Connell F, Jeffery S, Mortimer P. MilroyDisease. 2006 Apr 27 [updated 2014 Sep 25]. In: Adam MP, Ardinger HH, Pagon RA,Wallace SE, Bean LJH, Stephens K, Amemiya A, editors. GeneReviews® [Internet].Seattle (WA): University of Washington, Seattle; 1993-2020. Available from
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  4. Evans AL, Bell R, Brice G, Comeglio P, Lipede C, Jeffery S, Mortimer P,Sarfarazi M, Child AH. Identification of eight novel VEGFR-3 mutations infamilies with primary congenital lymphoedema. J Med Genet. 2003Sep;40(9):697-703.
  5. Ghalamkarpour A, Morlot S, Raas-Rothschild A, Utkus A, Mulliken JB, Boon LM,Vikkula M. Hereditary lymphedema type I associated with VEGFR3 mutation: thefirst de novo case and atypical presentations. Clin Genet. 2006 Oct;70(4):330-5.
  6. Irrthum A, Karkkainen MJ, Devriendt K, Alitalo K, Vikkula M. Congenitalhereditary lymphedema caused by a mutation that inactivates VEGFR3 tyrosinekinase. Am J Hum Genet. 2000 Aug;67(2):295-301.
  7. Karkkainen MJ, Ferrell RE, Lawrence EC, Kimak MA, Levinson KL, McTigue MA,Alitalo K, Finegold DN. Missense mutations interfere with VEGFR-3 signalling inprimary lymphoedema. Nat Genet. 2000 Jun;25(2):153-9.
  8. Levinson KL, Feingold E, Ferrell RE, Glover TW, Traboulsi EI, Finegold DN. Ageof onset in hereditary lymphedema. J Pediatr. 2003 Jun;142(6):704-8.
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Update Date: 23 Dec 2020