Milroy Disease Clinical Presentation
- Author: Raphael J Kiel, MD; Chief Editor: Zab Mosenifar, MD more...
History
- Edema occurs at birth and is firm to the touch, although pitting may occur with pressure. The temperature of the overlying skin is increased.
- The right lower extremity is preferentially involved. Generally, the edema involves the dorsum of the foot and does not extend beyond the level of the knee.
- Patients may also present with recurrent cellulitis, papillomatosis, large caliber leg veins, and upsloping "ski-jump" toenails.[10]
- Hydrocele was the second most common presentation after edema in males.
- Usually, several other family members have a history of congenital lymphedema.
Physical
- Brawny edema of a lower extremity is present at birth but usually does not extend above the knee. As the edema becomes chronic, a woody feel to the tissue may develop, signaling progressive tissue fibrosis.
- Hemorrhagic verruciform xanthoma is described on the dorsum of the toes.[11]
- The overlying skin often exhibits a rosy hue.
- Patients may have involvement of the external genitalia as a result of associated lymphatic abnormalities, and some may have a cystic hygroma of the neck.
Causes
- The cause of Milroy disease is classically thought to be due to the failure of lymphatic vessels to develop in utero. Failure of functional lymphatics may also play a role in the development of edema.
- Lymphatic drainage appears to be completely normal in the upper limbs.
- On a cellular level, Milroy disease has been related to defective VEGFR3 signaling mapped to a part of chromosome arm 5q. This region codes for a tyrosine kinase receptor specific for the function of the lymphatic vessels.
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