Researchers have found that strawberry-shaped birthmarks called infantile hemangiomas grow rapidly in infants much earlier than previously thought.

Infantile hemangiomas are the most common tumor in infancy. They tend to appear in the first weeks of life and grow as a child ages. Potential complications include permanent disfigurement of the face or functional compromise of vital organs.
"Our goal was to try to figure out when this actual period of rapid growth happened," says Megha Tollefson, M.D., a Mayo Clinic Children's Center researcher and pediatric dermatologist who conducted the study with Ilona Frieden, M.D., of the University of California, San Francisco. "Then we could potentially intervene if we had to."
The researchers examined photos of 30 infants from birth to 3 months, analyzing the color, thickness and distortion of anatomic landmarks.
Previously, physicians believed that the tumors grew during the first 5 months of life, but researchers had not yet discovered when the most rapid growth took place.
"By using a novel study design, we were able to demonstrate that the period of most rapid hemangioma growth of superficial hemangiomas occurs between 5.5 and 7.5 weeks of age," Dr. Frieden says.
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"Depending on where the hemangioma is located, it could potentially have long-term impact," Dr. Tollefson says. "We now have the possibility of preventing a lot of that."
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Source-Eurekalert