Courtesy: Juan Pretell MD, Chief of Orthopaedic Oncology, Miami Cancer Institute, Florida, USA

Unplanned Excision of Soft Tissue Sarcomas

Overview

Unplanned excision refers to removal of a soft tissue tumor:

Without appropriate imaging
Without biopsy
Without oncologic planning
Without intention to achieve tumor-free margins

This usually occurs when a sarcoma is mistaken for a benign lesion such as:

Lipoma
Hematoma
Cyst
Tendon injury

A large proportion of patients seen at specialized sarcoma centers are referred after unplanned excision.

Why Unplanned Excisions Occur

Important reasons include:

Soft tissue sarcomas are rare
Most present as painless masses
Minor trauma history may mislead clinicians toward hematoma diagnosis
Lack of familiarity with sarcoma management
Surgery performed before proper evaluation

Typical Clinical Scenario

Common sequence:

Patient presents with painless swelling
Lesion assumed benign
Tumor excised without MRI or biopsy
Histopathology reveals sarcoma
Patient referred to sarcoma center for further treatment

Definition of Unplanned Excision

Features include:

No proper preoperative imaging
No biopsy before surgery
No oncologic margin planning
Malignancy not suspected preoperatively
Often performed outside specialist oncology units

Clinical Features Suggesting Sarcoma

Red flag signs include:

Tumor >5 cm
Deep location beneath fascia
Rapid growth
Adherence to surrounding structures
Limited mobility
Regional lymphadenopathy

Recommended Initial Assessment

Clinical Evaluation

Important points:

Duration of swelling
Growth rate
Pain
Trauma history
Exposure to carcinogens
Mobility and depth of lesion

Imaging Evaluation

1. Plain Radiographs

May show:

Calcification
Bone erosion
Periosteal reaction

2. Ultrasound

Useful for:

Size assessment
Depth
Vascularity

However, it is operator dependent.

3. CT Scan

Useful for:

Cortical bone destruction
Retroperitoneal tumors

4. MRI (Most Important)

Preferred imaging modality for soft tissue masses.

MRI helps assess:

Tumor size
Extent
Relationship to neurovascular structures
Fascial involvement

Important principle:

MRI should ideally be obtained before biopsy to avoid post-biopsy artifacts.

Biopsy Principles

Core Needle Biopsy

Current standard method.

Advantages:

Minimally invasive
Accurate
Lower contamination risk

Important Oncologic Principles

Biopsy tract must be placed within future resection field
Avoid contamination of multiple compartments
Biopsy should ideally be performed at a sarcoma center

Approach to a Suspicious Soft Tissue Mass

Recommended strategy:

Clinical examination
MRI with contrast
Planned biopsy
Referral to sarcoma center if suspicious

Small superficial stable lesions <5 cm may occasionally be monitored.

Classification of Unplanned Excisions

1. Total Unplanned Excision

Entire tumor removed without proper workup

2. Partial Unplanned Excision

Some evaluation performed
Findings misinterpreted
Surgery still inadequately planned

Management After Unplanned Excision

Patients should be referred to a multidisciplinary sarcoma center.

Important records to obtain:

Operative notes
Histopathology slides
Imaging studies
Pathology reports

Restaging Evaluation

Local Staging

Usually performed with:

MRI of surgical bed

Purpose:

Detect residual tumor
Evaluate contamination

Distant Staging

Usually includes:

Chest imaging

Most common metastatic site:

Lungs

Tumor Bed Resection

Purpose

Remove residual microscopic disease
Excise contaminated tissues
Improve local control

Residual disease after unplanned excision is very common.

Challenges During Re-excision

Problems include:

Scar tissue obscuring anatomy
Difficulty identifying original tumor margins
Larger tissue resections required

Often more extensive surgery is necessary compared with planned oncologic excision.

Surgical Morbidity

Re-excision may require:

Muscle flaps
Skin grafts
Complex reconstruction

Consequences:

Longer hospitalization
Increased complications
Higher treatment cost

Role of Radiotherapy

Radiotherapy may:

Improve local control
Be used preoperatively or postoperatively

Preoperative radiotherapy followed by tumor bed excision is increasingly used.

Disadvantage:

Increased wound complications

Role of Chemotherapy

Chemotherapy depends mainly on:

Tumor grade
Tumor size
Metastatic risk

Generally considered for:

High-grade tumors
Metastatic disease

Prognostic Considerations

Unplanned excision increases risk of:

Local recurrence
Residual disease

Overall survival depends more on:

Tumor grade
Tumor biology
Metastatic potential

Prevention Strategies

Most important principle:

Prevention is the best treatment

Strategies include:

Increased awareness among clinicians
Proper imaging before surgery
Planned biopsy
Early referral to sarcoma centers
Avoiding excision of suspicious masses without evaluation

Key Orthopedic Oncology Pearls

Any soft tissue mass >5 cm should be considered malignant until proven otherwise
MRI before biopsy whenever possible
Never excise suspicious soft tissue tumors without diagnosis
Biopsy tract must be planned carefully
Residual tumor is common after unplanned excision
Re-excision improves local control
Multidisciplinary sarcoma management is essential

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