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Rhabdomyosarcoma in adults

K Hollowood¹, C D Fletcher

¹Department of Histopathology, St Thomas's Hospital (U.M.D.S.), London, England.

Seminars in Diagnostic Pathology

|February 1, 1994

Summary

Pleomorphic rhabdomyosarcoma is a major adult cancer, distinct from juvenile types. This review supports its classification as an aggressive, spindle-cell tumor with specific muscle differentiation markers.

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Area of Science:

Oncology
Pathology
Skeletal Muscle Neoplasms

Background:

Rhabdomyosarcomas present in adults as sporadic juvenile types or the more common pleomorphic rhabdomyosarcoma.
The diagnostic popularity of pleomorphic rhabdomyosarcoma has fluctuated historically.
This review addresses the controversy surrounding pleomorphic rhabdomyosarcoma as a distinct adult entity.

Purpose of the Study:

To review the historical context of pleomorphic rhabdomyosarcoma diagnosis.
To present the clinicopathologic characteristics of pleomorphic rhabdomyosarcoma in adults.
To describe the clinicopathologic features of juvenile rhabdomyosarcoma types occurring in adults.

Main Methods:

Literature review focusing on historical diagnostic trends.
Analysis of clinicopathologic features of pleomorphic rhabdomyosarcoma.
Examination of juvenile rhabdomyosarcoma presentations in adult patients.

Main Results:

Pleomorphic rhabdomyosarcoma is characterized as an aggressive, predominantly spindle-cell tumor in middle-aged adults.
Key diagnostic features include large, pleomorphic tumor cells.
Tumor cells exhibit focal immunophenotypic or ultrastructural sarcomeric muscle differentiation.

Conclusions:

The concept of pleomorphic rhabdomyosarcoma as a distinct clinicopathologic entity is supported.
Understanding its unique features is crucial for accurate adult rhabdomyosarcoma diagnosis.
Further research may clarify its controversial classification and relationship to juvenile types.

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