Kasabach-Merritt Syndrome Clinical Presentation
- Author: Bernice R Krafchik, MBChB, FRCPC; Chief Editor: Emmanuel C Besa, MD more...
History
The typical patient with Kasabach-Merritt phenomenon is an infant or young child, often male, who initially presents with a reddish brown or blue, tender skin lesion that rapidly evolves into a violaceous, bulging mass with petechiae and purpura. There is often a history of a blue lesion on the skin before the swelling and bruising. Occasionally there may be purpura and petechiae seen in many areas over the body with no history of a previous vascular lesion. This is seen in retroperitoneal and mediastinal lesions with DIC.
The natural history of kaposiform hemangioendothelioma is that of slow regression, with the lesion leaving a reddish brown discoloration that often does not resolve completely. It is unknown what percentage of kaposiform endotheliomas develop into Kasabach-Merritt phenomenon.
Physical
- Lesions of kaposiform hemangioendothelioma or tufted angioma or a mixture of both present with a blue or reddish brown discoloration and induration on the skin.
- When the thrombocytopenia increases, a large violaceous, ecchymotic indurated mass forms.
- Bruising and ecchymoses may occur at distant sites.
- Internal lesions may present with only bruising and ecchymoses on the skin.
- The lesions are usually painful and tender.
- Aggressive infiltration with ulceration, and infection is rare, but they can occur.
- Bleeding from thrombocytopenia and coagulopathy is observed both locally and at times distantly (DIC).
Causes
Kasabach-Merritt phenomenon occurs in lesions of kaposiform hemangioendotheliomas and tufted angiomas; the etiology of the phenomenon is unknown but may follow trauma in the area of the kaposiform endothelioma.
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