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Pathology · single question

A patient treated for testicular cancer presents with rampant caries. Which of the following is LEAST likely to be the cause?

  1. Xerostomia from chemotherapy or supportive medications
  2. Reduced oral hygiene during periods of illness
  3. Radiation therapy directed to the testicular region
  4. A high-carbohydrate diet adopted during treatment for weight maintenance
Show answer and explanation

Correct answer: C. Radiation therapy directed to the testicular region

  • A. Chemotherapy and supportive medications (antiemetics, opioids, antidepressants) commonly cause xerostomia, which does directly increase caries risk.
  • B. Fatigue, nausea, and mucositis all reduce hygiene compliance during treatment.
  • C. CORRECT — this is the LEAST likely cause. RADIATION-INDUCED caries requires the salivary glands to be within the RADIATION FIELD. Radiation directed at the testicular region does not reach the head and neck and therefore cannot damage the parotid or submandibular glands. Radiation caries is exclusively a consequence of head and neck irradiation.
  • D. High-calorie, high-carbohydrate nutritional supplements and frequent sipping to maintain weight during cancer treatment are a well-recognized caries driver.

Note: Radiation caries is location-specific: cervical, circumferential, rapidly progressive lesions in patients whose SALIVARY GLANDS were in the beam.

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