Immunostaining was done with appropriate positive and negative controls and revealed:
S100: showed scattered positivity in tumor cells.
Demin, Myogenin, ALK-1, CD34 are negative in tumor cells.
Ki-67 proliferation index about 10%.
Referred block for immunistaining of previously submitted biopsy from tongue swelling (pathology number 1971-2026) diagnosed as Atypical spindle cell proliferation suspicious of rhabdomyosarcoma (on 9 April 2026).
One referred paraffin block and one Hx&E stained slides coded 1971-2026.
Tongue lesion, biopsy and immunostaining:
COMMENT:
Complete excision of the lesion and follow up is recommended.