Pathology Which of the following is seen on electron microscopy of medullary thyroid carcinoma specimens? A Presence of electron-dense granules in the nucleus B Presence of electron-dense granules in the mitochondria C Presence of electron-dense granules in the endoplasmic reticulum D Presence of electron-dense granules in the cytoplasm 💡 Explanation Which of the following is seen on electron microscopy of medullary thyroid carcinoma specimens? ✓ Correct Answer: D. Presence of electron-dense granules in the cytoplasm