What Is a Sarcoma?
A sarcoma is a malignant tumour arising from mesenchymal tissue — the connective tissue that forms muscles, fat, blood vessels, nerves, tendons and cartilage. Sarcomas are rare, representing less than 1% of all adult malignancies, but they are the most common solid tumours in children and young adults. Over 70 histological subtypes exist.
Main Types of Sarcomas
Liposarcoma: Arises from fat tissue. Most common retroperitoneal sarcoma. Subtypes: well-differentiated, dedifferentiated, myxoid, round cell, pleomorphic — with very different behaviours. Leiomyosarcoma: Arises from smooth muscle. Common in the retroperitoneum, uterus, gastrointestinal tract and vascular walls. Gastrointestinal Stromal Tumour (GIST): Arises from interstitial cells of Cajal. Treated with targeted therapy (imatinib) and surgery. Synovial sarcoma: Typically affects young adults in the extremities. Responds to chemotherapy. Rhabdomyosarcoma: Arises from skeletal muscle precursors. Most common soft tissue sarcoma in children. Undifferentiated pleomorphic sarcoma (UPS): High-grade sarcoma of uncertain origin. Ewing sarcoma: Aggressive sarcoma of bone and soft tissue, most common in adolescents. Desmoid tumour (aggressive fibromatosis): Locally aggressive but non-metastasising. Complex management.
Diagnosis
Imaging: MRI is preferred for extremity sarcomas; CT for intra-abdominal. PET-CT for staging. Biopsy: Core needle biopsy (not excisional biopsy) by an experienced team. Biopsy site and technique affect subsequent surgical planning. Pathology review at a sarcoma reference centre is essential for accurate subtype diagnosis. Molecular testing: Increasingly important for subtype classification and targeted treatment decisions (FISH for MDM2, NGS panels).
Treatment Principles
Wide en-bloc surgical resection with clear margins is the cornerstone. Adjuvant or neoadjuvant radiotherapy for selected extremity sarcomas. Chemotherapy for specific subtypes (synovial sarcoma, rhabdomyosarcoma, Ewing). Targeted therapy for GIST (imatinib). Immunotherapy emerging for selected subtypes. Retroperitoneal sarcomas require multivisceral resection at specialised centres.
Why the Subtype Matters Less Than Who Operates
Knowing the subtype and grade helps you understand the diagnosis, but in sarcoma one factor outweighs any classification: the first operation. It is what determines the real prognosis.
A sarcoma excised with inadequate margins, or opened during the procedure, changes the entire picture: local recurrence risk rises and far more aggressive reoperations become necessary. An en bloc resection with adequate margins at the first attempt is what separates disease control from relapse.
This is why European guidelines recommend that every sarcoma be treated at a reference centre before the first operation, not after something has gone wrong.
Retroperitoneal and Abdominal Sarcomas: The Hardest Setting
Around 30% of soft tissue sarcomas arise in the retroperitoneum or abdomen, and they are the most technically demanding. They grow without symptoms until they reach considerable size and end up surrounded by critical structures: kidney, great vessels, pancreas, colon.
Removing them correctly often requires multivisceral resection and, on occasion, vascular reconstruction. This is not surgery that can be improvised: it demands a team with oncovascular capability and sufficient volume in abdominal and retroperitoneal sarcoma.
If the sarcoma has already been operated on and has recurred, salvage surgery remains a real option in selected cases, although the room for manoeuvre is narrower.
Have you been diagnosed with a sarcoma, or is one suspected? A second opinion contributes most before the first operation. We review the imaging and tell you whether the planned resection is right for your case. Request an assessment.