Endocrine Pathology

For each of the following patients, select the most likely pathologic finding:

1. A 42-year-old man has recently passed a urinary calculus that is composed of calcium oxalate. He has abdominal pain, and upper GI endoscopy reveals several sharply demarcated 1 cm gastric antral ulcerations. He has pain in his lower extremities:

2. A 51-year-old woman has increasing lethargy and darker skin tone for 6 months. On examination she is hypotensive. Laboratory studies show Hgb 12 g/dL, sodium 132 mmol/L, potassium 3.4 mmol/L, chloride 100 mmol/L, HCO3^- 21 mmol/L, glucose 65 mg/dL, and creatinine 1 mg/dL:

3. A 20-year-old woman has exhibited increased nervousness for several months. She has palpitations. She has lost 7 kg without dieting or a change in exercise patterns:

4. A 39-year-old man has a blood pressure of 160/100 mm Hg that persists for months. A serum chemistry panel shows sodium 141 mmol/L, potassium 2.8 mmol/L, chloride 101 mmol/L, CO₂ 25 mmol/L, glucose 90 mg/dL, creatinine 1.2 mg/dL, and urea nitrogen 15 mg/dL:

5. A 42-year-old woman is found to have a palpable neck mass on routine physical examination. Imaging procedures show a 'cold' nodule in the thyroid along with an enlarged lymph node:

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