Retroperitoneal, Liver, and Lymph Node Metastasis from Proximal Tibial Osteosarcoma: A Case Report

Area of Science:

• Oncology
• Orthopedic Surgery
• Medical Oncology

Background:

• Osteosarcoma (OS) is a primary bone tumor, second only to multiple myeloma in adults.
• Pulmonary and bone metastases are common in advanced osteosarcoma.
• Extrapulmonary metastases are infrequent but increasingly recognized.

Purpose of the Study:

• To report a rare case of osteosarcoma with an unusual metastatic pattern.
• To highlight the impact of modern chemotherapy on osteosarcoma metastasis sites.
• To discuss the clinical implications of altered metastatic patterns in osteosarcoma.

Main Methods:

• Case report of a male adult diagnosed with proximal tibial osteosarcoma.
• Treatment involved limb salvage surgery with endoprosthetic reconstruction.
• Adjuvant chemotherapy was administered post-operatively.

Main Results:

• The patient presented with metastases to the liver, bone, and inguinal lymph nodes.
• No local recurrence in the tibia was observed.
• No pulmonary metastases were detected.
• The metastatic pattern was atypical for osteosarcoma.

Conclusions:

• Modern chemotherapy regimens may influence the metastatic behavior of osteosarcoma.
• Unusual metastatic sites, including visceral organs and lymph nodes, can occur.
• Awareness of altered metastatic patterns is crucial for accurate diagnosis and treatment planning in osteosarcoma.