Preexisting Shoulder Disease and SIRVA: Does an Abnormal MRI Rule Out Vaccine-Related Injury?
Updated: Aug 13
One of the most difficult questions in evaluating Shoulder Injury Related to Vaccine Administration (SIRVA) arises when MRI or ultrasound demonstrates abnormalities that may have existed before vaccination.
A patient may report a previously normal, pain-free shoulder, develop substantial pain shortly after vaccination, and subsequently undergo MRI showing rotator cuff tendinopathy, a partial tear, osteoarthritis, labral degeneration, bursitis, or several of these findings simultaneously.
What does that mean?
The answer is not simply that the abnormal MRI proves SIRVA. But the reverse is also true: the presence of degenerative or potentially preexisting pathology does not, by itself, establish that the patient's post-vaccination symptoms were present before vaccination or unrelated to it.
The distinction between preexisting structural abnormality and preexisting symptomatic shoulder disease is therefore central to an appropriate SIRVA causation analysis.
Key Takeaways
Many abnormalities identified on shoulder imaging can occur without symptoms.
Traditional SIRVA definitions focus on whether there was prior shoulder pain, inflammation, or dysfunction sufficient to explain the current presentation, not simply whether imaging after vaccination shows structural abnormalities.
Conversely, common abnormalities such as rotator cuff tendinopathy or tearing should not automatically be attributed to vaccination merely because they were discovered afterward.
Systematic reviews of SIRVA have specifically raised concern that persistent post-vaccination shoulder pain may coexist with common incidental shoulder pathology.
The appropriate question is usually not “Was the MRI abnormal?” but “What best explains the transition from the patient's pre-vaccination clinical state to the post-vaccination clinical state?”
SIRVA Is a Clinical Diagnosis, Not an MRI Diagnosis
The VICP-derived definition summarized by Zheng and colleagues illustrates an important point.
The definition requires:
pain and reduced range of motion in the vaccinated shoulder,
onset within 48 hours,
no prior history of pain, inflammation, or dysfunction in that shoulder that would explain the condition,
no other condition or abnormality that better explains the symptoms, and
persistent symptoms.
Notice what this does not say. It does not require a structurally pristine shoulder before vaccination.
The relevant issue is whether there was a preexisting clinical condition capable of explaining the current presentation.
That distinction becomes important because MRI is extremely sensitive to structural abnormalities that may or may not be symptomatic.
Structural Abnormality Is Not the Same as Symptomatic Disease
Suppose a previously asymptomatic patient develops acute shoulder pain after vaccination and an MRI performed several weeks later demonstrates a partial-thickness supraspinatus tear.
There are several possibilities. The tear could have:
existed before vaccination and remained incidental;
existed before vaccination but become symptomatic after the event;
been aggravated by a vaccine-related inflammatory process;
represent a new structural injury related to injection;
have become symptomatic for an unrelated reason; or
simply be unrelated to the patient's actual pain generator.
MRI alone usually cannot distinguish among all of these possibilities.
This is why causation should not be inferred solely from the name of an imaging abnormality.
The Incidental Pathology Problem
This issue has generated substantial debate within the SIRVA literature.
Slette, Rohrback, and Ring performed a systematic review specifically titled “Persistent Shoulder Pain After Vaccine Administration Is Associated With Common Incidental Pathology.”
That work represents an important cautionary perspective: abnormalities identified after vaccination may represent common shoulder disease rather than pathology created by the injection.
Similarly, the Slette review alongside systematic reviews by MacMahon et al. and Wright et al. when discussing the current evidence surrounding SIRVA.
This concern is legitimate. A rotator cuff tear discovered after vaccination should not automatically be labeled a vaccine-induced tear. But identifying a potentially incidental abnormality is only the beginning of the analysis.
Asymptomatic Rotator Cuff Abnormalities Are Common
The broader shoulder literature reinforces why this distinction matters.
Recent systematic work has specifically evaluated rotator cuff imaging abnormalities in asymptomatic shoulders, while another large investigation has examined incidentally detected rotator cuff abnormalities on MRI.
The implication for SIRVA evaluation is important:
An imaging abnormality can predate vaccination without the patient's symptoms predating vaccination.
This is particularly relevant in middle-aged and older adults, in whom degenerative cuff abnormalities become increasingly common.
Therefore, saying that a tear “looks degenerative” may support the conclusion that the structural tear itself was not created by the injection. It does not necessarily answer the separate question of what caused a previously asymptomatic shoulder to become painful.
The Literature Itself Illustrates the Problem
The individual cases in the SIRVA literature frequently demonstrate abnormalities that could plausibly have been preexisting.
For example, Boonsri and Chuaychoosakoon described a 51-year-old woman who developed shoulder pain within three hours of Oxford-AstraZeneca vaccination.
Ultrasound demonstrated marked subacromial-subdeltoid bursitis together with a small full-thickness supraspinatus tear. The authors proposed that injection location and depth could have allowed penetration of the bursa or rotator cuff.
However, our extraction of that report specifically identifies an important causation limitation: a preexisting asymptomatic rotator cuff tear could not be excluded.
That is exactly the kind of uncertainty that should be preserved in an independent review.
The patient may have had vaccine-related bursitis with an incidental tear. The tear may have contributed to symptoms. Or both processes may have interacted. Without pre-vaccination imaging, certainty regarding the age of the tear is limited.
Calcific Tendinopathy Provides Another Useful Example
The SIRVA literature contains reports of calcific tendinopathy becoming symptomatic after vaccination.
Klabklay et al. and Nakajima et al. describing calcific tendinitis following COVID-19 vaccination.
The National Academies evidence review likewise catalogued cases in which imaging demonstrated calcification together with acute post-vaccination symptoms. For example, one reported patient developed symptoms three hours after vaccination with calcific tendinitis identified on ultrasound, while another developed symptoms immediately and imaging demonstrated supraspinatus calcium with inflammatory subdeltoid bursitis.
Vaccination obviously need not have created a mature calcium deposit within hours.
The more plausible question is whether an existing deposit became symptomatic in association with a new local inflammatory event.
This illustrates why:
causing an imaging abnormality and
causing symptoms associated with an imaging abnormality
are not necessarily the same question.
Can Vaccination Make Preexisting Disease Symptomatic?
This is biologically plausible in some circumstances, but the evidence remains limited.
SIRVA is generally proposed to occur when vaccine material is inadvertently introduced into tissues adjacent to the deltoid, potentially producing a localized inflammatory response involving bursae, tendons, capsule, or other periarticular structures.
If a patient already has asymptomatic tendinopathy or a small cuff tear, inflammation in the adjacent bursa or tendon could theoretically convert a clinically silent abnormality into a symptomatic one.
But demonstrating plausibility is not the same as establishing causation in an individual patient. The evidence should still be tested against the chronology, anatomy, imaging, examination, and competing explanations.
What About a Prior History of Shoulder Pain?
This is different from an incidental MRI finding.
Documented pre-vaccination:
shoulder pain,
restricted range of motion,
prior injections,
physical therapy,
orthopedic evaluation,
surgery,
recurrent symptoms, or
treatment for the same pathology
can materially weaken a claim that the entire subsequent condition represents a new SIRVA event.
Zheng's summary of the VICP definition specifically excludes patients with prior shoulder pain, inflammation, or dysfunction that would explain the alleged condition.
The qualifying language matters.
A remote episode of minor shoulder pain years earlier is not necessarily equivalent to active symptomatic disease immediately before vaccination.
The medical record should therefore establish what the shoulder was actually doing before the vaccination.
Prior Imaging Can Be Particularly Valuable
When available, pre-vaccination imaging can dramatically improve causation analysis.
Consider three scenarios.
Scenario 1: Same tear before and after vaccination
A pre-vaccination MRI documents a chronic supraspinatus tear essentially unchanged on the post-vaccination MRI.
That makes it difficult to argue that vaccination created the tear.
But if the patient was previously asymptomatic and developed immediate new pain, it remains reasonable to ask whether another superimposed process, such as bursitis or synovitis, accounts for the new symptoms.
Scenario 2: Normal prior imaging
A recent pre-vaccination MRI is normal and post-vaccination imaging demonstrates a new anatomically plausible abnormality.
That temporal imaging comparison may substantially strengthen evidence of a new process.
Scenario 3: No prior imaging
This is probably the most common situation.
The absence of prior imaging means the age of many structural abnormalities cannot be established with certainty. The analysis must then rely more heavily on prior clinical history, imaging characteristics, timing, anatomy, and alternative causes.
Acute Findings and Chronic Findings Should Not Be Treated Equally
Certain imaging abnormalities may be more useful for establishing a new inflammatory process than others.
Potentially nonspecific/chronic findings
tendinosis,
degenerative labral change,
osteoarthritis,
partial-thickness cuff tearing,
AC joint arthrosis.
Potentially more temporally informative findings in the correct clinical context
substantial new bursal fluid,
synovitis,
focal edema,
bone marrow edema,
inflammatory soft-tissue change,
evolution on serial imaging.
Even these findings are not specific for SIRVA. But they may provide different information about acuity than chronic degenerative abnormalities.
The National Academies review demonstrates this heterogeneity: reported acute rotator cuff and biceps cases include tendon tears and tendinosis, but also edema, inflammatory bursitis, biceps tenosynovitis, and focal myotendinous abnormalities.
The Other Side of the Argument Matters
A balanced review must also recognize that temporal association can be misleading.
Shoulder disorders are common.
A patient can receive a vaccine on Monday and develop unrelated rotator cuff symptoms on Tuesday.
The fact that one event preceded another does not establish causation.
This is why Slette and colleagues' emphasis on incidental pathology is important, and why systematic reviews have questioned whether some abnormalities labeled SIRVA represent common shoulder conditions discovered because vaccination prompted evaluation.
Similarly, population and surveillance studies generally cannot prove causation in an individual patient.
The possibility of coincidence should therefore remain part of the differential diagnosis.
A Better Framework: Three Separate Questions
When preexisting disease is present, I find it useful to separate three questions.
1. Did the structural abnormality exist before vaccination?
Sometimes yes, sometimes no, and often it cannot be determined.
2. Was that abnormality symptomatic before vaccination?
This is a different question and should be answered from the clinical record rather than inferred from post-vaccination imaging.
3. What caused the patient's new symptoms?
This is the actual causation question.
The answer might be:
a new vaccine-related injury,
aggravation of preexisting disease,
activation of previously asymptomatic pathology,
progression of ordinary degenerative disease,
an unrelated new shoulder condition, or
some combination of these.
Separating these questions prevents a common logical error:
“The MRI abnormality was probably preexisting; therefore, the symptoms must also have been preexisting.”
The second conclusion does not automatically follow from the first.
What Evidence Strengthens a SIRVA Causation Analysis?
When potentially preexisting pathology is present, causation is generally more persuasive when several findings align:
A previously asymptomatic shoulder
followed by
a clearly documented vaccination
followed by
immediate or rapid onset of new ipsilateral symptoms
with
an anatomically plausible injection mechanism
and
objective findings consistent with the symptomatic region
without
intervening trauma or another more persuasive explanation.
Conversely, causation becomes more difficult when there is active pre-vaccination shoulder disease, substantial treatment immediately before vaccination, delayed or poorly documented symptom onset, imaging dominated by chronic degenerative disease, or another event capable of explaining the symptoms.
Preexisting Disease Does Not Have a Single Meaning
This may be the most important point. A patient can have:
Preexisting structural disease without symptoms, or
Preexisting symptomatic disease, or
Preexisting disease that is subsequently aggravated, or
Preexisting disease completely unrelated to the new pain generator.
Those situations should not be treated as equivalent.
The SIRVA literature itself contains this ambiguity. Our evidence database includes cases with rotator cuff tears, calcific tendinopathy, degenerative findings, and other abnormalities for which preexisting asymptomatic pathology could not be excluded.
This uncertainty is not a weakness in the analysis. It is part of the medical evidence.
The Bottom Line
Preexisting shoulder pathology neither automatically excludes nor establishes SIRVA.
An abnormal MRI obtained after vaccination cannot by itself tell us:
when an abnormality developed,
whether it was previously symptomatic,
whether it is the current pain generator, or
whether vaccination caused or aggravated it.
Likewise, the absence of documented shoulder symptoms before vaccination does not prove that every abnormality subsequently identified was created by the injection.
The appropriate analysis asks a more clinically meaningful question:
What best explains the patient's change from the pre-vaccination state to the post-vaccination state?
Answering that question requires integration of prior symptoms, prior treatment, timing of onset, injection anatomy, examination, imaging, alternative causes, clinical course, and—when available—pre-vaccination imaging.
That is considerably more informative than simply labeling an MRI finding as either “degenerative” or “vaccine-related.”
References
Slette E, Rohrback M, Ring D. Persistent shoulder pain after vaccine administration is associated with common incidental pathology: a systematic review. Clin Orthop Relat Res. 2022;480(7):1251-1258.
MacMahon A, Nayar SK, Srikumaran U. What do we know about shoulder injury related to vaccine administration? An updated systematic review. Clin Orthop Relat Res. 2022;480(7):1241-1250.
Wright JO, Wiggins W, Smith MS, King JJ, Wright TW. Shoulder pain and dysfunction after vaccination: a systematic review. JBJS Rev. 2023;11(1).
Zheng C, Duffy J, Liu ILA, Sy LS, Navarro RA, Kim SS, et al. Identifying cases of Shoulder Injury Related to Vaccine Administration (SIRVA) in the United States: development and validation of a natural language processing method. JMIR Public Health Surveill. 2022;8(5):e30426.
Sanders S, Ibounig T, Haas R, et al. Rotator cuff imaging abnormalities in asymptomatic shoulders: a systematic review. J Orthop Sports Phys Ther. 2025;55:1-16.
Ibounig T, Järvinen TLN, Raatikainen S, et al. Incidental rotator cuff abnormalities on magnetic resonance imaging. JAMA Intern Med. 2026;186:406-414.
Boonsri P, Chuaychoosakoon C. Combined subacromial-subdeltoid bursitis and supraspinatus tear following a COVID-19 vaccination: a case report. Ann Med Surg (Lond). 2021;69:102819.
Klabklay P, Boonsri P, Kanyakool P, Chuaychoosakoon C. A COVID-19 vaccination precipitating symptomatic calcific tendinitis: a case report. Ann Med Surg (Lond). 2022;74:103347.
Nakajima K, Miyata A, Kato S, Oshima Y, Tanaka S. Calcific tendinitis of the shoulder induced by an mRNA vaccine for COVID-19: a case report. Mod Rheumatol Case Rep. 2023;7(1):211-214.
Donners R, Gehweiler J, Kovacs B, et al. Chronic stage magnetic resonance imaging findings in patients with shoulder injury related to vaccine administration (SIRVA). Skeletal Radiol. 2023;52:1695-1701.
Bass JR, Poland GA. Shoulder injury related to vaccine administration (SIRVA) after COVID-19 vaccination. Vaccine. 2022;40(34):4964-4971.
National Academies of Sciences, Engineering, and Medicine. Evidence Review of the Adverse Effects of COVID-19 Vaccination and Intramuscular Vaccine Administration. Washington, DC: National Academies Press; 2024.
About the Author
Walter I. Sussman, DO, FAAPM&R is a board-certified Sports Medicine and Physical Medicine & Rehabilitation physician.
This article is intended for educational purposes and does not constitute a medical opinion regarding any individual case. Assessment of diagnosis and causation requires review of the specific medical history, records, imaging, and circumstances involved.
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