a little fluid around her heart/ the little of fluid around the lining of heart; This is a spontaneous report received from a contactable reporter (Consumer or other non-HCP) from the Medical Information Team, Program ID. The reporter is the patient.  A 67-year-old female patient received bnt162b2, bnt162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), as DOSE 5 (BOOSTER), SINGLE (batch/lot number: unknown) for COVID-19 immunization. The patient's relevant medical history included: "she had a takotsubo cardiomyopathy", start date: 2016 (unspecified if ongoing), notes: she had a couple of symptoms. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (first dose, via an unspecified route of administration, on an unspecified date (batch/lot number: unknown) as DOSE 1, SINGLE) for COVID-19 immunization; Bnt162b2 (second dose, via an unspecified route of administration, on an unspecified date (batch/lot number: unknown) as DOSE 2, SINGLE) for COVID-19 immunization; Bnt162b2, bnt162b2 omi ba.4-5 (third dose, via an unspecified route of administration, on an unspecified date (batch/lot number: unknown) as DOSE 3 (BOOSTER), SINGLE) for COVID-19 immunization; Bnt162b2, bnt162b2 omi ba.4-5 (fourth dose, via an unspecified route of administration, on an unspecified date (batch/lot number: unknown) as DOSE 4 (BOOSTER), SINGLE) for COVID-19 immunization. The following information was reported: PERICARDIAL EFFUSION (medically significant), outcome "unknown" described as "a little fluid around her heart/ the little of fluid around the lining of heart." It was reported that the caller had 5 shots of Pfizer vaccines and she wanted to get the other one but she was diagnosed with a "mild oral infusion" (pending confirmation), a little fluid around her heart. She would like to know if that is okay. Caller confirmed she is 67 years old, calling regarding the Pfizer Covid-19 vaccine, 2023-2024 formula (as reported). Caller states she has been seeing a cardiologist. Caller states in 2016 she had a takotsubo cardiomyopathy where she had a couple of symptoms. Caller states she was in the hospital in March and in May. Caller states at that time they saw fluid around her heart in the electrocardiogram. Caller states she then had another echo in August. Caller states she is not sure how she got the little of fluid around the lining of her heart. Caller states her doctor in August told her it is nothing to worry about. Caller states she needs to check with her doctor about when it was first noticed in the electrocardiograms. Caller states she took a medication prescribed by the hospital doctor. Caller states she contacted her doctor about getting this updated Covid-19 vaccine, and the doctor said it should be okay. Caller states the pharmacist at (withheld) was very hesitant about the fluid around the lining of her heart. Caller would like to know if this would be a risk, and would it make it worse? Caller declined a warm transfer to agency as she does not know for a fact if she got this from the Pfizer vaccines. The event "a little fluid around her heart/ the little of fluid around the lining of heart" required physician office visit. Therapeutic measures were taken as a result of pericardial effusion.  The information on the batch/lot number for bnt162b2, bnt162b2 omi ba.4-5 has been requested and will be submitted if and when received.