For professionals · English

Recognizing DISH: Criteria and Clinical Context

Apply established and early imaging criteria, interpret prevalence and pain data in context, and identify the clinical questions that need action.

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The finding and the clinical question

Diffuse idiopathic skeletal hyperostosis (DISH), also known as Forestier disease, is characterized by ossification at ligament and tendon attachments. Flowing anterolateral spinal bone formation is its familiar appearance. Assessment begins with the reason for the examination and the patient’s symptoms: an incidental chest radiograph finding, gradually restricted movement, dysphagia, and pain after a fall require different next steps.

A practical consultation establishes the structural pattern, evaluates the current symptoms, and checks for complications. Ask the patient to identify the activity that has become difficult and when the change began. Review the images alongside that account. This makes it easier to distinguish longstanding restriction from a new regional problem.

Record the reason for imaging. Was DISH found on a chest study obtained for another purpose, during evaluation of chronic stiffness, or after a fall? An incidental finding and new post-traumatic pain should not enter the same leisurely diagnostic pathway.

Use the classic criteria precisely

The classic Resnick–Niwayama criteria describe flowing anterolateral ossification along at least four contiguous vertebral bodies, relative preservation of disc height at the involved levels, and absence of apophyseal ankylosis and the specified sacroiliac erosions, sclerosis, or intra-articular fusion. Four vertebral bodies span three intervertebral spaces. Document both the extent and the accompanying joint findings. ¹

These criteria remain an important common language. Their interpretation also requires restraint. Relative disc-height preservation is not a promise that an older patient has no degeneration anywhere in the spine. Describe coexisting disc or facet disease and decide whether the dominant bridging pattern is adequately explained by it.

CT has broadened our understanding of the sacroiliac appearance: periarticular bridges and intra-articular ankylosis can occur in patients classified as having DISH. Describe their location and assess erosions and other evidence of sacroiliitis in context. ²

Distribution and epidemiology

The thoracic region is a frequent and useful place to recognize the phenotype. Thick, flowing anterolateral bone formation is more suggestive than an isolated pointed osteophyte. Cervical and lumbar appearances can be less stereotyped, and peripheral entheseal ossification may provide additional context. The diagnostic argument should describe where the new bone is, what it looks like, and what the study does not show.

DISH is commonly recognized in later adulthood. In a randomly selected MrOS sample of 298 community-dwelling men aged 65–100 years, 126 (42%) met the study’s DISH definition. The proportions rose from 30% at ages 65–69 to 56% at age 80 or older. These estimates describe that male cohort; they should not be presented as the prevalence in all older adults or applied to women. ³

Age at presentation and age at symptom onset should be recorded separately. A 70-year-old may describe inflammatory back symptoms beginning at 25. Metabolic comorbidities provide useful context, but they do not decide the imaging diagnosis. The term “non-inflammatory” also has limits: the DISH structural phenotype alone does not establish an indication for treatment of immune-mediated axial disease.

Early DISH: a useful research concept

The classic criteria preferentially identify established ossification. Kuperus and colleagues developed and validated CT criteria using incomplete and near-complete bridges in longitudinal cohorts. These criteria describe an earlier imaging stage associated with subsequent definite DISH. They help characterize an evolving pattern, while their clinical use still requires assessment of competing explanations. ⁴

An early-phase research definition is not a reason to screen every patient with stiffness using CT. If available images fall short of the classic threshold, describe the extent and uncertainty. For example, “multilevel hyperostotic change, insufficient for the established DISH pattern on this examination” leaves room for later review without overstating the diagnosis.

Comparison with earlier studies can show whether bridging has developed over years. The date on which DISH first appears in a report is often a date of recognition rather than a reliable date of onset. Routine repeat imaging solely to assign an earlier label is unlikely to help when no clinical decision would change.

Connect the image to function and symptoms

Ask about turning the head, footwear, transfers, walking, swallowing, and recent trauma. Examine the symptomatic region and neurological function when indicated. Holton’s MrOS analysis found less self-reported back pain over the preceding year in men with DISH than in those without it: 59% versus 71%, with an adjusted prevalence ratio of 0.73 (95% CI 0.57–0.95) after adjustment for age, BMI, and blood pressure. This cross-sectional association does not establish a protective effect or determine the cause of an individual patient’s pain. ³

Record the structural phenotype, the best-supported explanation of current symptoms, and any complication requiring a separate pathway. A newly reduced walking distance could reflect hip disease, lumbar stenosis, cardiopulmonary limitation, pain, or several of these. An established DISH label should help organize the examination without replacing it.

A useful first-visit conclusion

Describe: regions, morphology, continuity, disc and facet context, and imaging limitations.
Attribute cautiously: explain which symptoms are plausibly related and which remain unresolved.
Identify priority: trauma, neurological change or clinically significant swallowing difficulty may take precedence over phenotype refinement.
Plan: select further evaluation only when it answers a specific clinical question.

Practice point: document the imaging pattern, the patient’s main functional problem, and the next clinical action separately. New post-traumatic pain, neurological change, or progressive dysphagia should be addressed before routine follow-up.

Evidence reviewed as of October 30, 2026

Sources and further reading

Professional Essentials

Patient Essentials · English