Salivary Gland FNA

FNA Indications

Core rule Any focal salivary incidentaloma should be assessed with ultrasound. Solid or solid-dominant salivary incidentalomas generally require US-guided FNA cytology.

Recommend US-guided FNA when

Solid or solid-dominant salivary lesion.
Indeterminate CT, MRI, PET, or ultrasound appearance.
Diagnosis will alter treatment, surgery, or follow-up.
Cystic lesion is symptomatic, enlarging, thick-walled, has mural nodularity, or has a solid component.
Suspicious intraparotid or cervical lymph node can be sampled during the same ultrasound-guided session.

Macro: Solid or indeterminate salivary mass - targeted ultrasound plus US-guided FNA for Milan System cytology classification.

When FNA May Not Be Needed

Often observe / no biopsy

Classic intraparotid lymph node: small, oval, homogeneous, fatty hilum or classic nodal appearance, and no suspicious clinical context.
Tiny simple cyst: thin wall, no solid component, no mural nodule, and no wall thickening.
Known benign stable lesion: prior benign FNA or histology, stable imaging appearance, no growth, and no new symptoms.
Repeat FNA is usually reserved for interval growth or a change in clinical/imaging concern.

Do not skip FNA if

Solid component, mural nodule, infiltrative margin, suspicious nodes, growth, symptoms, or malignancy context.
Cystic lesion is symptomatic, enlarging, thick-walled, or concerning for cystic neoplasm.

FNA vs CNB

FNA first-line

First-line for most solid salivary masses.
Minimally invasive and widely used for benign versus malignant triage.
Supports Milan System cytology category and risk stratification.
Can sample suspicious adjacent intraparotid or cervical lymph nodes.

Add or prefer CNB when

Suspected lymphoma or need for tissue architecture.
Repeated nondiagnostic or equivocal FNA.
High-grade or anaplastic concern.
Definitive pre-operative histology is important for management.

Reference Images