This specialty deals with the diagnosis of diseases of soft tissues (such as muscles, tendons, and fat) and bones. This includes identifying benign and malignant tumors such as lipomas, fibromas, and sarcomas (connective tissue cancers). Pathologists in this field also diagnose bone diseases such as osteosarcoma, bone metastases, and conditions such as osteoporosis. Their expertise is vital in determining the aggressiveness of tumors and guiding surgical or oncological treatments.