Cellular tumor composed of proliferating spindle cells arranged in intersecting fascicles and whorly bundles, featuring focal nuclear palisading. Tumor cells exhibit elongated, blunt-ended nuclei with mild anaplasia and low mitotic activity.
Immunostaining was done with appropriate positive and negative controls and revealed:
Referred block for immunostaining of biopsy from pelvic mass, previously submitted and diagnosed as cellular spindle cell tumor on 22 January 2026 (pathology number 390-2026).
One referred paraffin block and one H&E slide of previously submitted case with pathology number 390-2026.
Immunostaining of pelvic mass biopsy: