aneurysm; dizziness; started to shake; hives on face; pain in my arm; vomited fluids with foam; Feel like a numbness in the right side of tongue; Feel like a numbness in throat; face turned numb/ head was numbed; numbness on the arm; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of ANEURYSM (aneurysm), DIZZINESS (dizziness), TREMOR (started to shake), URTICARIA (hives on face), HYPOAESTHESIA (numbness on the arm), HYPOAESTHESIA ORAL (Feel like a numbness in the right side of tongue), PHARYNGEAL HYPOAESTHESIA (Feel like a numbness in throat), HYPOAESTHESIA (face turned numb/ head was numbed), PAIN IN EXTREMITY (pain in my arm) and VOMITING (vomited fluids with foam) in a 40-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 014C21A and 031A21B) for COVID-19 vaccination.     No Medical History information was reported.   On 31-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 27-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 19-Mar-2021, the patient experienced HYPOAESTHESIA (numbness on the arm) (seriousness criterion hospitalization). On 27-Apr-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced HYPOAESTHESIA ORAL (Feel like a numbness in the right side of tongue) (seriousness criterion hospitalization), PHARYNGEAL HYPOAESTHESIA (Feel like a numbness in throat) (seriousness criterion hospitalization), HYPOAESTHESIA (face turned numb/ head was numbed) (seriousness criterion hospitalization) and VOMITING (vomited fluids with foam) (seriousness criterion hospitalization). On 28-Apr-2021, the patient experienced PAIN IN EXTREMITY (pain in my arm) (seriousness criterion hospitalization). On 19-May-2021, the patient experienced TREMOR (started to shake) (seriousness criterion hospitalization) and URTICARIA (hives on face) (seriousness criterion hospitalization). On an unknown date, the patient experienced ANEURYSM (aneurysm) (seriousness criterion hospitalization) and DIZZINESS (dizziness) (seriousness criterion hospitalization). The patient was hospitalized until 21-May-2021 due to ANEURYSM, DIZZINESS, HYPOAESTHESIA, HYPOAESTHESIA, HYPOAESTHESIA ORAL, PAIN IN EXTREMITY, PHARYNGEAL HYPOAESTHESIA, TREMOR, URTICARIA and VOMITING. The patient was treated with DIPHENHYDRAMINE HYDROCHLORIDE (BENADRYL [DIPHENHYDRAMINE HYDROCHLORIDE]) for Vaccination adverse reaction, at a dose of 25 milligram; LORATADINE for Vaccination adverse reaction, at an unspecified dose and frequency; FAMOTIDINE for Hyperacidity, at an unspecified dose and frequency and PREDNISONE for Vaccination adverse reaction, at an unspecified dose and frequency. At the time of the report, ANEURYSM (aneurysm), DIZZINESS (dizziness), TREMOR (started to shake), URTICARIA (hives on face), HYPOAESTHESIA (numbness on the arm), HYPOAESTHESIA ORAL (Feel like a numbness in the right side of tongue), PHARYNGEAL HYPOAESTHESIA (Feel like a numbness in throat), HYPOAESTHESIA (face turned numb/ head was numbed), PAIN IN EXTREMITY (pain in my arm) and VOMITING (vomited fluids with foam) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In May 2021, Angiogram: inconclusive (Inconclusive) An Aneurysm was found.. In May 2021, Computerised tomogram: inconclusive (Inconclusive) Inconclusive. In May 2021, Magnetic resonance imaging: inconclusive (Inconclusive) No obstruction seen in arteries of brain. In May 2021, Scan with contrast: obstruction in artery (Inconclusive) Obstruction found in one of the arteries of brain.         Concomitant product use was not provided by the reporter. Patient was also prescribed EpiPen for treatment of vaccination adverse reaction.  The patient received both scheduled doses of mRNA-1273 prior to the events, therefore action taken with the drug in response to the events was not applicable.  Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.   Most recent FOLLOW-UP information incorporated above includes: On 24-May-2021: Updated events after the scheduled second dose of mRNA-1273 - Aneurysm, Tremor, Urticaria, Hypoesthesia upper extremities, dizziness, pain in extremity. Updated seriousness criteria of events to Hospitalization. Updated Medical Confirmation to Yes. Updated Diagnostic Data - CT scan, Angiogram, MRI scan and contrast media study. Updated treatment medications.; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.