A 50-year-old female presents with a 2 cm solitary thyroid nodule. Fine needle aspiration biopsy reveals malignant follicular cells arranged in papillary architecture with ground-glass nuclei (Orphan Annie eyes) and psammoma bodies. What is the diagnosis and its general prognosis?

Answer and explanation

Correct answer: A. Papillary thyroid carcinoma; excellent prognosis with high long-term survival

  1. Step 1: Analyze cytopathology: Optically clear nuclei ('Orphan Annie' eye nuclei), nuclear grooves, pseudoinclusions, and psammoma bodies are pathognomonic for papillary thyroid carcinoma.
  2. Step 2: Recall epidemiology and prognosis: Papillary thyroid carcinoma is the most common thyroid malignancy (80-85% of cases) and carries an excellent 10-year survival rate (>95%) when treated surgically.
  3. Step 3: Confirm diagnosis: Papillary thyroid carcinoma.
Answer
Papillary thyroid carcinoma; excellent prognosis with high long-term survival.
Why not the others: 'Anaplastic carcinoma' presents in the elderly as a rapidly enlarging, highly aggressive mass composed of pleomorphic spindle cells; 'Medullary carcinoma' arises from C-cells (calcitonin-producing) with amyloid stroma; 'Benign goiter' lacks nuclear optical clearing and malignant architecture.

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