S1-guideline cutaneous and subcutaneous leiomyosarcoma

Area of Science:

• Dermatology
• Surgical Oncology
• Pathology

Background:

• Superficial leiomyosarcomas (LMS) are uncommon cutaneous sarcomas originating from dermal or subcutaneous muscle tissues.
• These tumors are distinct from deep soft tissue leiomyosarcomas and typically present as painful nodules on extremities, trunk, or scalp.

Purpose of the Study:

• To review the characteristics, diagnosis, and management of superficial leiomyosarcomas.
• To outline recommended surgical margins and follow-up protocols based on tumor subtype and completeness of resection.

Main Methods:

• Histopathological diagnosis is the standard for superficial LMS.
• Complete (R0) microscopically controlled excision is the primary treatment modality.
• Recommended safety margins are 1 cm for dermal LMS and 2 cm for subcutaneous LMS.

Main Results:

• Dermal LMS with R0 resection and 1 cm margins exhibit very low local recurrence and rare metastasis.
• Subcutaneous LMS, large tumors, or incompletely excised LMS have higher rates of recurrence and metastasis.
• Clinical follow-up is recommended every six months for dermal LMS and every three months for subcutaneous LMS for the first two years.

Conclusions:

• Superficial LMS management hinges on complete surgical excision with appropriate margins.
• Tailored follow-up schedules are crucial, particularly for subcutaneous LMS, to monitor for recurrence and metastasis.
• Advanced imaging is reserved for specific clinical scenarios like complex primary tumors or suspected recurrence/metastasis.