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Soft tissue tumors of the larynx are extremely rare. Our patient was a 41-year-old Japanese male with a chief complaint of hoarseness. In the larynx, a slightly reddish tumor was observed on the anterior third portion of the right vocal cord. Laryngeal laser microsurgery(LMS)was performed to remove part of the tumor. The pathological diagnosis was suspected to be malignant fibrous histiocytoma, and the differential diagnosis was angiomatoid fibrous histiocytoma or undifferentiated pleomorphic adenoma; the tumor was reportedly not a high-grade malignant lesion. After surgery, the residual tumor showed rapid regrowth, so a second round of LMS was performed to completely remove the residual tumor. After this second surgery, mucosal injection and swelling was observed on the subglottic region of anterior commissure and anterior region of the right arytenoid. A third round of LMS was performed, but no residual tumor was identified. After this third procedure, the patient showed no recurrence. – The final pathological diagnosis was “unusual atypical spindle cell tumor, unclassified” with low-grade malignancy. The pathological classification of soft tissue tumors has been changed. Physicians should keep in mind that rare soft tissue tumors of the larynx include low-grade malignant spindle cell tumors, which can be cured by LMS, as shown in this case report.

A Case of Low-grade Malignant Spindle Cell Tumor of the Larynx, Unclassified by the 2013 World Health Organization Classification of Soft Tissue Tumor