Pathology · single question
A 68-year-old female with a 2×3 cm moveable, non-painful mass on the lower lip that has grown over 2-3 years with no apparent cause — what is the most likely etiology?
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Correct answer: C. Neoplastic
A slow-growing, painless, moveable mass on the lower lip that has enlarged over 2-3 years with no trauma history or identifiable cause is most consistent with a NEOPLASTIC process (benign tumor such as a pleomorphic adenoma, lipoma, or other salivary gland tumor). Traumatic mucoceles are typically fluctuant and have a history of trauma. Large, slowly growing painless masses with no apparent cause should be considered neoplastic until proven otherwise.
- A. INCORRECT. Immunological lesions (aphthous stomatitis, pemphigoid) are painful and recurrent — not slow-growing painless masses.
- B. INCORRECT. Viral lesions (HPV warts, herpetic lesions) are typically smaller, have associated symptoms, and don't present as a 2×3 cm growing firm mass.
- C. CORRECT. A 2×3 cm slowly growing, moveable, painless mass with no identified trauma or reactive cause is most consistent with a NEOPLASTIC etiology — likely a benign salivary gland tumor (pleomorphic adenoma) or mesenchymal tumor.
- D. INCORRECT. Idiopathic implies no identifiable cause, but a 2×3 cm slow-growing mass with specific features points to a SPECIFIC etiology (neoplasm) even if the exact subtype isn't yet diagnosed.