This document discusses several types of giant cell lesions and bone cysts that can occur in the oral cavity and jaws. It provides clinical descriptions, radiographic images and photomicrographs of peripheral giant cell granuloma, pyogenic granuloma, central giant cell granuloma, giant cell tumor, cherubism, aneurysmal bone cyst, simple bone cyst and lesions associated with hyperparathyroidism. The radiographs and photomicrographs illustrate characteristics of each lesion for clinical and histological diagnosis.