Metastases from the lung presenting as a parotid lump

Area of Science:

• Oncology
• Diagnostic Imaging
• Pathology

Background:

• Parotid gland masses can be challenging to diagnose, with malignancy being a significant concern.
• Fine needle aspiration (FNA) is a common initial diagnostic tool for parotid lesions.
• Metastatic disease to the parotid gland, while uncommon, can mimic primary parotid tumors.

Observation:

• A 59-year-old male presented with a preauricular facial lump initially suspected as parotid malignancy via FNA.
• Imaging revealed a lung mass with metastases, creating diagnostic uncertainty regarding the parotid lesion's origin.
• The parotid mass was ultimately confirmed as metastatic disease from a carcinoma of unknown primary origin.

Findings:

• Infraclavicular metastasis to the parotid gland is a rare clinical entity.
• Diagnostic dilemmas can arise when metastatic disease presents atypically in the parotid.
• Coexisting medical conditions and atypical cytological findings in FNA can complicate diagnosis.

Implications:

• Clinicians should maintain a high index of suspicion for metastatic disease to the parotid, even when rare.
• Comprehensive diagnostic workup, including advanced imaging, is essential for determining the origin of parotid masses.
• Considering metastatic disease from unknown primaries is vital for appropriate patient management and treatment planning.