Coronavirus: Pfizer and Moderna vaccines cause swelling visible on mammograms

Injections of the Moderna and Pfizer Covid-19 vaccines are likely to cause swelling of the lymph nodes. The phenomenon detectable by medical imaging can be mistaken for a worrying symptom of breast cancer but is predictable and benign after vaccination.

L’Massachusetts General Hospital (United States) published a press release on Tuesday, March 2 warning about the swelling of the mammary glands observed in some patients vaccinated against Covid-19. The Boston-based facility explained that the phenomenon was likely to occur in subjects who received an injection of the serum in the arm.

The US Centers for Disease Control and Prevention cited by The Hill specified that the phenomenon had been observed after injections of sera Pfizer and Moderna. It starts between two and four days after vaccination. This type of swelling, visible on a mammogram, can be a sign of breast cancer development and lead to a biopsy being done. The latter have also multiplied in the United States, reports CNN.

Schedule screening before receiving the first dose

But in the case of patients who received the vaccine, this reaction is as normal as it is mild, assured the American radiologists. It arises from a reaction of the lymph nodes to serum. However, it must be the subject of a medical supervision if the area does not loosen or if the patient has a special medical history.

Women are invited to schedule breast cancer screening before receiving their first dose of Covid-19 vaccine. For those who have already received it, it is advisable to wait four to six weeks after the second dose to make an appointment for a mammogram. The Massachusetts hospital has also urged patients not to delay their vaccinations and to attend their medical examinations.

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