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Good Positive and Negative Likelihood Ratios

Poorly Diagnostic Findings

Sialolithiasis: Likelihood Ratios

Introduction: None written.

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The likelihood ratios of findings for Sialolithiasis are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %.	Post-Test Probability (Predictive Value): %.	Switch to display mode.
Note that calculating probabilities from more than one** finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)

Good Positive and Negative Likelihood Ratios
Finding	Result	+LR	-LR
[ + ] MRI Sialography	+ 0 -	5	0
this visualizes the ducts. Stones are invisible on MR. Sens/spec vary based on MR modality. Study: Radiology 2000 Sep;216(3):665-71. PMID 10966693
[ + ] Ultrasound	+ 0 -	4	0.3
Study: Radiology 2000 Sep;216(3):665-71. PMID 10966693

Poorly Diagnostic Findings
Finding	Result	+LR	-LR
[ + ] CT Scan		Sensitivity = 100%
high-res, non-con Study: AJR Am J Roentgenol 1982 Sep;139(3):547-54. PMID 6981322
[ + ] X-Ray		Sensitivity = 60%
for parotid stones. For submandibular stones, sensitivity is 80-95% (just based on radio-opaqueness). Study: UTD: http://www.utdol.com/online/content/topic.do?topicKey=prim_ent/7995