Most of submitted fragments are blood clots and necrotic fragments with minimally reptesented tumor formed of irregular trabeculae of rounded cells with rather uniform
rounded nuclei. The vast majority of cells show cytoplasmic vacuolations of variable size that appear to coalesce forming microcystic spaces.
Picture is highly suggestive of chordoma, recommend for Confirmatory marker study (CK, S100, Brachyury)
Predominantly cystic sacral tumor (highly suspicious for a cystic chordoma) that destroys the S1-S3 vertebrae, compresses the rectum and urinary bladder, and infiltrates the left piriformis and gluteal muscles, complicated by multiple enhancing intraspinal drop lesions at the D12 and L3-L5 levels, with no evidence of thoracic metastasis.
Soft tissue fragments collectively measured 5.5x5x1.7 cm, totally embedded.
Sacral mass, incision biopsy: