## Most Common Benign Salivary Gland Tumor **Key Point:** Pleomorphic adenoma (mixed tumor) is the most common benign salivary gland tumor, accounting for 45–60% of all parotid tumors and 50–80% of all benign salivary gland neoplasms. ### Clinical Features of Pleomorphic Adenoma - **Location:** Parotid gland (80%), submandibular gland (10%), minor salivary glands (10%) - **Presentation:** Slow-growing, painless, mobile mass - **Age:** Typically 40–60 years - **Growth rate:** Very slow; may remain stable for years ### Histopathology - Mixed epithelial and myoepithelial components - Characteristic "Swiss cheese" appearance with myxoid, chondroid, and hyaline stroma - Well-demarcated but NOT encapsulated (pseudo-encapsulated) - **Critical point:** Recurrence risk if incompletely excised due to satellite nodules ### Management - **Treatment:** Surgical excision with superficial or total parotidectomy (depending on location) - **Prognosis:** Excellent; malignant transformation rare (<5% over 20 years) - **Recurrence:** 2–5% if properly excised; up to 45% if enucleated ### Comparison with Other Benign Tumors | Feature | Pleomorphic Adenoma | Warthin's Tumor | Oncocytoma | |---------|-------------------|-----------------|------------| | Frequency | 45–60% of parotid | 5–15% of parotid | 1–2% | | Age | 40–60 years | 50–70 years | 60+ years | | Location | Parotid > submandibular | Parotid (tail) | Parotid | | Gender | Equal | Male >> female | Male >> female | | Growth | Very slow | Slow | Slow | | Malignant potential | <5% | None | None | **High-Yield:** Pleomorphic adenoma is the single most common salivary gland tumor overall — both benign and malignant combined in the parotid gland.
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