Ewing's Sarcoma

Original Editors - from Bellarmine University's Pathophysiology of Complex Patient Problems project.

Top Contributors - Joseph Dorrell, Lisa Miville, Elaine Lonnemann, Nikhil Benhur Abburi, Jack Tencza, Lucinda hampton, Tessa Larimer, Admin, Vidya Acharya, Khloud Shreif, Kim Jackson, Ahmed M Diab, WikiSysop, Claire Knott, 127.0.0.1 and Wendy Walker  

Introduction

Ewing-sarcoma-distal-femur

Ewing’s Sarcoma (ES) is the second highest grade malignant primary tumour of childhood and adolescence between 10-20 years of age, and can arise in soft tissue or bone. ESs typically are found in the medullary cavity, appearing as moth-eaten, destructive lesions in the shaft of long bones, and onion skin periostitis. The most common sites are the pelvis, axial skeleton, and femur, but they may occur in almost any bone or soft tissue. Patients with ES within distal extremities have a better prognosis than patients having a lesion in proximal extremities.

Locations:

1. Lower limbs: 45%(femur most common)
2. Pelvis: 20%
3. Upper limbs: 13%
4. Spine and ribs: 13%(sacrococcygeal)
5. Skull/face: 2%.

Epidemiolgy

Ewing sarcoma account for less than 5% of all soft tissue sarcomas. ES usually appears in children and adolescents between 10-20 years of age (with 95% being between 4-25 years of age).Males are more affected than females (M:F 1.5:1). The ES family of tumours primarily occurs in White patients. In the United States, the incidence in the Asian/Pacific Islander population is about one-half that in the White population, while the incidence in the Black population is one-ninth that in White population. The incidence of Ewing’s Sarcoma has relatively been unchanged for the past 30 years and occurs  2.93 children per 1 million in the United States. .

Etiology

The cell of origin of Ewing sarcoma has yet to be fully explained. It has been found that 95% of Ewing's tumours are derived from a specific reciprocal translocation between chromosomes 11 and 22. The molecular oncogenesis remains unknown.

Prognosis

Once a uniformly fatal tumour now has better survival rates, although these differ with location. eg Spinal tumours having an 86% long-term survival compared to 25% of sacrococcygeal tumours. Overall the 5-year survival rate is roughly 50-75% for patients with local disease only at the time of presentation.

Characteristics/Clinical Presentation

Occasionally a soft tissue mass is palpable

Local pain at the affected site is usually the initial symptom. The pain may be worse during exercise or at night and can be accompanied by swelling or a lump, redness, and warmth (see in this picture swelling of the left side). The pain is typically intermittent and ma progress to be more consistent. Tumours that are deep inside the body such as the pelvis can be hidden from observation and inspection.

It is common to see fatigue, weight loss, decreased appetite, weakness and numbness, and/or paralysis or Urinary Incontinence (if the tumour is of spinal origin). Fever, anaemia, and leukocytosis may occur with this tumour and a palpable mass may present. The tumour may be present for months before there are any signs or symptoms. Symptoms can vary from patient to patient in terms of severity and can disappear from weeks to months at a time Insufficiency Fractures also occur.. Systemic symptoms include ESR elevation. Ewing's Family of Tumors are highly malignant. It most commonly spreads to the lungs, but it can also metastasize to the kidney, bone marrow, heart, adrenal gland, and other soft tissues.
As a physical therapist, one should be cautious when the symptoms of "growing pains" or a proposed sports injury are out of proportion or abnormal.

Differential Diagnosis

• Osteomyelitis
• Osteosarcoma
• Metastatic disease
• Haematological malignancy
• Eosinophilic granuloma
• Neuroblastoma

Diagnosis

Periostitis and soft tissue swelling.

The diagnosing Ewing’s Sarcoma depends on full patient history, symptoms and clinical presentation. X-rays of the affected area may show destructive confluent '' moth-eaten" lesions, an elevated periosteum, or multilayered "onion-skin" periosteal reaction.

Other tests that may be performed to rule in Ewing’s Sarcoma and determine staging are bone scans, CT scans, MRI, blood tests (elevated lactate dehydrogenase and red blood cell sedimentation rate) and biopsy for bone marrow, for example, to know whether it spreads to bone marrow or not. These tests in combination are important to find the location of the tumour and to determine if the tumour is localized or has diffused to other areas of the body to help guide treatment. Biopsy is considered the gold standard test for diagnosis of Ewing’s Sarcoma.

Differential Diagnosis

• Osteomyelitis
• Osteosarcoma
• Metastatic disease
• Haematological malignancy
• Eosinophilic granuloma
• Neuroblastoma

Medical Management

Systemic chemotherapy is the central part of treatment with surgery and/or radiotherapy having a role depending on the size and location of the tumour. Medical management is considered a multidisciplinary effort which includes orthopaedic surgical oncologists, pediatric or adult medical oncologists, radiation oncologists, pathologists, and radiologists. Most patients are treated at major hospital institutions or cancer centres.

Physical Therapy Management

Physical therapy (PT) can be beneficial for those diagnosed with ES for many reasons and at different stages during the management process. The most common limitations for patients undergoing chemotherapy include fatigue, paralysis, or weakness, cognition, and weight loss/ gain
Pre-operative PT is beneficial when feasible. Plan of care should include strengthening of the affected limb and aerobic conditioning (precaution: avoid weight bearing on an extremity or placing weight distal to the extremity in which tumour is located).
Post-operative PT is essential but caution must be taken because of the impaired healing process due to chemotherapy. Precautions include: stretching the skin in the area of the incision, weight-bearing status and lab values (especially platelet count). Some general guidelines include aerobic conditioning, strengthening, continuous passive range of motion, and aquatic therapy. Research suggests that knowledge on the changes occurring in muscle architecture and its impact on long-term impairments in bone sarcoma survivors after limb salvage surgery can impact rehabilitation treatment outcomes.
If amputation is done, it may take the child several months to learn to use a prosthetic leg or arm. A physical therapist will be able to assist in fitting and donning the prosthesis, teaching the child how to use it, and how to use necessary assistive devices. Children may also have a tissue graft, which the child needs to start moving almost immediately. Physical therapy and rehabilitation is typically recommended for six to twelve weeks post operation.

Watch this 2 minute video on PT management
                                    

Ewing’s Sarcoma Case Study

Keywords

Fatigue, treatment, fever, bone pain, cancer, therapy, symptoms
Authors

Jack Tencza and Joseph Dorrell
Abstract

Ewing’s Sarcoma is the 2nd most commonly diagnosed form of primary bone cancer in children and young adults. In this example, a case study of an 18 year old Caucasian female gymnast is examined to help health care professionals identify a possible clinical case of Ewing’s Sarcoma.
Introduction

Ewing’s Sarcoma family of tumours are a group of small round cell tumours that include Ewing’s Sarcoma, Extraosseous Ewing Sarcoma, Askin Tumor, and Primitive Neuroectodermal Tumor. This cancer primarily affects children and adolescents, and most often affects soft tissue and bone. The most common sites for Ewing’s Sarcoma is the pelvis, hip, femur, tibia and fibula.

Case Presentation

Subjective :
Patient History: Pt. is an 18-year old Caucasian female who reports with a recent history of right hip pain of 5/10 during the day and 7/10 at night. She reports limping from a cartwheel at gymnastics 2 months ago. She reports that she has had night sweats with intermittent fever and general fatigue during the day. Pt. reports that she has had a recent physical examination 5 months ago with her GP who found that she was underweight. GP states this could be possibly due to female athlete triad. She notes that she has been more attentive with her diet and exercise since then. Pt. states her goal is to return to gymnastics pain-free and as soon as possible.

Medical History: Unremarkable
Objective-: Physical Examination Tests and Measures

Observation/ Palpation: Pt. has to pinpoint tenderness around R ASIS, and notes pain with R weight shifting
Lumbar ROM
Lumbar Flexion 65
Lumbar Extension 35
Lumbar Side bend 20
Lumbar Rotation 30

Hip ROM Right Left
Hip Flexion     85 130
Hip Extension 15 30
Hip IR            20 40
Hip ER          25 40
Hip ABD       25 45

MMT
L Hip 5/5 in all planes
R Hip 4/5 in all planes (pain)
UE ROM: WNL
UE MMT: WNL

Neurovascular: decreased sensation along R lateral thigh
Special Tests:
FABER - Negative
Scour Test - Positive
Anterior Labral Tear - Negative
Impingement Test - Positive

Clinical Impression

Examination findings show decreased ROM and weakness of the R hip with palpable pinpoint pain, tenderness, and warmth. No other musculoskeletal abnormalities found to be present. Working diagnosis of female athlete triad and hip impingement. Targeted interventions include strengthening the R hip musculature, improving R hip ROM in all planes, manual therapy to decrease pain and improve function, and modalities for pain relief.

Intervention

Hip AROM/ PROM exercises
Standing hip flexion, extension, abduction, IR and ER resistance exercises
Wall slides & standing squats
Hip long axis traction

Outcomes

Over a period of 5 visits, pt’s s/s did not improve. the Pain intensified to a 7/10 during the day and an 8/10 at night. PT then determined that pt needed to be referred out for imaging of the hip. Pt went to MD and received X-Ray which indicated a possible tumour of the pelvis. Blood tests indicated elevated lactate dehydrogenase and red blood cell sedimentation rate. MD referred to Oncologist for a biopsy which confirmed an Ewing’s Sarcoma of the pelvis. Pt received chemotherapy and radiation.

Discussion

Ewing’s Sarcoma is a malignant bone tumour which in this case affects a female, which is not as common as a male. In this case, the pt. demonstrated constitutional signs and symptoms including night sweats, weakness, fatigue, intermittent fever and increased pain at night which could indicate a systemic problem. Physical therapists should be aware that Ewing’s Sarcoma can mimic musculoskeletal signs and symptoms which can make it difficult to diagnosis. It is imperative to monitor the patient and refer out to patient’s MD when appropriate to prevent further metastasis of the tumour. The pelvic and hip region is the most common area affected by Ewing’s Sarcoma and can be difficult to observe and palpate due to its location. In this case the pt did not improve upon multiple visits which would indicate it is not a musculoskeletal pathology and the pt. was referred to her primary care provider for further testing.