Overview / No Work-Up

Likely benign / no further work-up

• Typical small intraparotid lymph node with benign morphology.
• Tiny simple cyst without solid component or wall thickening.
• No symptoms, palpable mass, aggressive imaging feature, or suspicious cervical lymphadenopathy.
• Consider ultrasound only if clinically indicated.

Worrisome features

• Ill-defined or infiltrative margins, adjacent fat stranding, or deep space extension.
• Heterogeneous solid lesion, necrosis, perineural spread, or deep lobe lesion.
• Suspicious cervical lymph nodes or imaging findings concerning for malignancy.

WFUMB Approach

Suggested next step

• Small typical intraparotid lymph node: usually no further work-up.
• Tiny uncomplicated cyst: usually no further work-up.
• Small well-circumscribed solid lesion: targeted ultrasound.
• Indeterminate solid lesion: ultrasound plus US-guided FNA.
• Aggressive-appearing lesion: urgent ultrasound, FNA, and ENT/oncology referral.

Core principles

• Most incidental salivary lesions are benign primary neoplasms or pseudotumors.
• Ultrasound is the usual next imaging step for CT/MRI salivary incidentalomas.
• Solid lesions generally need US-guided FNA.
• FNA results are reported with the Milan System to stratify malignancy risk.

Milan / Reporting

Milan system reminder

• Radiologists do not assign Milan categories on CT/MRI.
• Recommend US-guided FNA for solid lesions so cytology can assign a Milan category.
• High-yield categories: IVa benign neoplasm, IVb SUMP, V suspicious for malignancy, VI malignant.
• Risk of malignancy rises sharply from IVb through VI and guides ENT/surgical planning.

Report language

• Likely benign neoplasm: incidental well-circumscribed salivary lesion; recommend targeted ultrasound and US-guided FNA for solid lesion, with Milan System cytologic reporting.
• Indeterminate lesion: incidental solid salivary lesion with indeterminate imaging features; recommend ultrasound and US-guided FNA.
• Suspicious for malignancy: ill-defined salivary mass with concerning features; recommend urgent ultrasound, tissue sampling, and ENT/oncology evaluation.
• Classic intraparotid lymph node or tiny simple cyst: no further imaging or intervention may be reasonable.

Sources

• WFUMB salivary incidentaloma position paper
• Milan System for Reporting Salivary Gland Cytopathology
• Local head and neck incidentalomas PDF