Hypothesis: Sentinel node (SN) biopsy for breast cancer enhances staging sensitivity, often demonstrating only micrometastases (Ͻ2 mm) or isolated, keratinpositive cells. When SN metastasis is present, the value of additional axillary dissection is unclear and not all patients benefit from axillary lymph node dissection (ALND).

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Background: Parathyroidectomy may increase bone density in primary hyperparathyroidism (PHPT), but it is unclear whether fracture risk is decreased. Hypothesis: Parathyroidectomy decreases fracture risk. Design: Retrospective cohort study with median follow-up of 6.5 years. Setting: Twelve regional hospitals in California. Patients: One thousand five hundred sixty-nine patients with PHPT.