ASP Sarcoma; ASPS

Alveolar Soft Part Sarcoma (ASP) is a rare type of soft tissue sarcoma occurring primarily in children and adolescents. These tumors are usually located in the head and neck, arms or legs (usually the deep thigh area), chest, abdomen, genital organs, or anal area.

These tumors usually arise in the soft tissues containing many blood vessels, but can also grow inside the bones. The exact cause of ASP is unknown, but some scientific research suggests that genetic mutations in the ASPL and TFE3 genes are contributory to the cause of ASP.

Diagnostic testing:

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  X-ray;

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  CT scan;

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  MRI scan;

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  Bone scan;

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  Ultrasound exam;

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  Bone marrow aspiration and biopsy;

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  Lumbar puncture;

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  Immunohistochemistry study; and

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  Cytogenetic analysis.

Physical findings: Physical findings of ASP depend on the site of the tumor and degree of metastases. These signs may include:

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  A painless swelling or lump;

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  Pain or soreness caused by compressed nerves or muscles; and

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  Limping or other difficulty using the legs and feet.

ICD-9: 171.9

ASP occurs mainly in children between the ages of infancy to approximately 19 years of age. The prognosis is poor if there are metastases to other sites. Persons with ASP tumors may relapse several years after a prolonged period of apparent remission.

SUGGESTED PROGRAMMATIC ASSESSMENT*

Suggested MER for Evaluation:

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  Clinical history and examination that describes the diagnostic features of the impairment;

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  Biopsy reports; and

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  Imaging reports.

REMARKS

Listing level severity of soft tissue sarcomas in adults must be documented by metastases, or by recurrence or persistence following initial anti-neoplastic treatment.