Osteochondromas, which usually develop between age 10-20, are the most common noncancerous primary bone tumors.
Giant cell tumors generally develop in a section of the thigh bone near the knee
Langer-Giedion syndrome was first described by A. Langer and I. Giedion in 1968. They reported a series of cases with distinctive physical features, including skeletal abnormalities and multiple benign growths called osteochondromas.
Two types of tumors are benign and malignant tumors. Benign tumors are usually harmless and grow at a slow rate. However, they can grow larger and become problematic. Malignant tumors are the opposite, growing at a fast rate and causing serious health problems.
osteochondroma A benign cartilaginous neoplasm that consists of a pedicle of normal bone (protruding from the cortex) covered with a rim of proliferating cartilage cells; may originate from any bone that is preformed in cartilage, but is most frequent near the ends of long bones, usually in patients 10-25 years of age; the lesion is frequently not noticed, unless it is traumatized or of large size; multiple osteochondromas are inherited and referred to as hereditary multiple exostoses.