Iodide mumps: sonographic appearance

Management of iodine contrast induced salivary gland swelling (sialadenitis): experiences from an observational study

BACKGROUND

Iodine contrast-induced sialadenitis (CIS) is an uncommon adverse effect to iodine-containing contrast exposition. There is scarce literature about its clinical course and demography.

OBJECTIVES

(1) To determine the clinical course and management of CIS. (2) To understand if CIS might be as rare as reported.

MATERIAL AND METHODS

A 2-month prospective observational study was conducted in the emergency room of a tertiary institution. ENT physicians on call received clinical formation about CIS while emergency physicians did not. During the study period, patients admitted at the emergency room matching the clinical and radiological features of CIS, were included. Information about demographics, iodine exposure, diagnostic workup, clinical course, and management was analyzed.

RESULTS

ENT physicians on call detected 4 cases, however, emergency physicians did not. Patients were aged 68-76 years and presented a bilateral submandibular gland swelling debuting 12 to 72 h after an exposure to iodinated contrast. Characteristic ultrasonographic findings supported the diagnosis and the clinical course was self-limited after 60 to 150 h.

CONCLUSIONS AND SIGNIFICANCE

Physicians' familiarity with CIS allows its detection and avoids costly and potentially harmful therapeutic/diagnostic efforts. The incidence is probably underestimated; however, further incidence studies are needed.

Akute Schwellung im Halsbereich nach iodhaltigem Kontrastmittel – der oft unerkannte Iodmumps anhand von drei Fallbeispielen

Es werden drei Patientinnen vorgestellt, die zur Abklärung einer akuten Halsschwellung nach einer Untersuchung mit iodierten Kontrastmitteln zugewiesen wurden. Bei allen drei war ein akutes Angioödem vermutet worden, das allerdings nicht ausreichend auf Antihistaminika und Kortikosteroide ansprach. Es wurde schließlich ein sog. „Iodmumps“ oder Iod-assoziierte Sialoadenopathie diagnostiziert. Sonografisch und histologisch finden sich lediglich ein Ödem der Speicheldrüsen, hingegen keine Hinweise für eine ausgeprägte entzündliche Reaktion. Diese Komplikation ist nicht so selten und wird von Iod selbst ausgelöst, wie mit einer Provokation mit Iod-Kaliumiodid (Lugolʼscher Lösung) nachgewiesen werden konnte. Die pathophysiologisch ungeklärte Iod-assoziierte Sialoadenopathie wird somit als idiosynkratische Reaktion klassifiziert.

A case of acute bilateral iodine-induced submandibular sialadenitis: Ultrasound findings

Acute sialadenitis is a rare adverse reaction to iodine-based contrast agents. Ultrasound (US) is usually the preferred imaging method to evaluate the salivary glands; along with clinical and anamnestic data, US allows the diagnosis of contrast-induced sialadenitis. We present a case of acute bilateral submandibular sialadenitis induced by intravenous administration of iodine-based contrast media for a contrast-enhanced computed tomography scan diagnosed by US.

Characterization of Iodide-induced Sialadenitis: Meta-analysis of the Published Case Reports in the Medical Literature

PURPOSE

To evaluate the patient presentation of postcontrast sialadenitis and factors associated with its duration of symptoms through meta-analysis of case reports.

BACKGROUND

Acute iodide sialadenitis, or "iodide mumps," is a rare adverse reaction to iodinated contrast causing salivary gland swelling. The condition may be underdiagnosed, with researchers postulating that its true incidence may be close to 1-2%.

METHODS AND MATERIALS

This study was a meta-analysis performed using PRISMA Reporting Standards. A literature search with no language restriction was performed of the Medline database, primarily through PubMed, using keywords: "iodide mumps," "iodide sialadenitis," "sialadenitis," "salivary enlargement," "contrast reaction," "parotid swelling," and "submandibular swelling." Matching case reports and case series were reviewed, and data regarding the subjects' demographics, renal function, contrast administration, and symptoms were extracted. Uni- and multivariate linear regression analyses were applied to assess the predicting factors of a prolonged symptoms duration.

RESULTS

Sixty-five case reports and case series were identified, with 77 cases of iodide-induced sialadenitis. Two cases were unpublished and from the author's institution. Reported subjects' median age was 63 years, and 61% (47/77) were males. Median time to onset was 16 hours, and symptoms resolved in a median of 3 days after the initial onset. Twenty-seven subjects (35%, 27/77) were reported to have an impaired renal function at baseline. Administration of nonionic, low osmolarity contrast medium was reported most frequently (53%, 41/77). There was no difference in resolution of symptoms among subjects with impaired versus normal renal function. Symptoms were resolved in all cases over a median of 3 days with no statistically significant difference between those who received therapeutic intervention and those who did not (p = 0.430). Older age and longer time to onset were significantly associated with longer duration of symptoms in both uni- and multivariate linear regression models, and presence of tenderness demonstrated statistical significance associated with longer duration of symptoms in the univariate model.

CONCLUSION

Postcontrast sialadenitis is a rare reaction to iodinated contrast media. Older age and a longer time to onset of symptoms are associated with longer duration of symptoms.

Iodinated contrast-induced sialadenitis: a review of the literature and sonographic findings in a clinical case

Swelling of the salivary glands, also known as iodide or iodine mumps, is a rare adverse reaction to administration of iodine, a component steadily present in current contrast media and in a variety of medications. We report and compare with published literature the clinical and sonographic findings in a case of iodide mumps that developed after the intravenous administration of iodine-based contrast media for a contrast-enhanced computed tomography scan. The exact pathogenesis is unknown to date: based on sonographic appearance, we support the hypothesis of an acute inflammatory condition elicited by iodine accumulation in the salivary glands. The emergency care practitioner needs to be confident with the clinical symptoms as well as the sonographic findings and therapeutic options to successfully manage this condition.

Swelling of the salivary glands, also known as iodide or iodine mumps, is a rare adverse reaction to administration of iodine, a component steadily present in current contrast media and in a variety of medications. We report and compare with published literature the clinical and sonographic findings in a case of iodide mumps that developed after the intravenous administration of iodine-based contrast media for a contrast-enhanced computed tomography scan. The exact pathogenesis is unknown to date: based on sonographic appearance, we support the hypothesis of an acute inflammatory condition elicited by iodine accumulation in the salivary glands. The emergency care practitioner needs to be confident with the clinical symptoms as well as the sonographic findings and therapeutic options to successfully manage this condition.