The patient went on to have incomplete resection of the mass. 

Histology

MACROSCOPIC DESCRIPTION:

"Sacral tumour":  Multiple pieces of rubbery pink and fawn tissue up to 150mm in gteratest dimension. Areas of gelatiknous material are noted as well as gritty foci consistent with bone. Areas of haemorrhage are also seen.

MICROSCOPIC DESCRIPTION:

The sections show a densely hypercellular tumour. This is composed of cells with small round and oval vesicular nuclei. The immediately perinuclear cytoplasm is densely eosiniphilic but vacuolated peripherally. This vacuolation imparts a physalliferous appearance. Tumour cells are arranged in small solid aggregates and cords within mucinous material. Lobules of tumour are separated by coarse collagenous septa and have a pushing margin with adjacent soft tissues. Invasion of bone is noted in some fragments. Scattered mitotic figures are identified. No tumour necrosis is seen. Areas of recent haemorrhage are noted in some tumour lobules.  No mature cartilage is identified. The overall features are of chordoma.

FINAL DIAGNOSIS: Chordoma.

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