Rare soft-tissue sarcoma of the breast

What happened, in summary

A postmenopausal woman in her early 60s had noticed a left-breast lump growing quickly for about 6 months. She delayed seeking care despite increasing pain. By the time she was assessed, the mass measured about 20 x 20 cm, occupied almost the entire breast, and had broken through the skin to form an ulcerated wound.

A needle sample initially suggested a malignant phyllodes tumor. Because of the size and skin involvement, she underwent mastectomy. The operation removed the breast tissue, nipple-areola complex, and involved skin. Lymph-node surgery was not performed because the suspected tumor type was expected to spread through the bloodstream rather than first through the lymph nodes.

Detailed examination of the removed tumor showed a high-grade spindle-cell sarcoma with several patterns of tissue differentiation. Immunohistochemistry was strongly positive for TLE1, while a broad group of other markers was negative. The final diagnosis was a rare primary soft-tissue sarcoma of the breast, classified as grade 3 and pT4.

Further assessment found that the cancer had already spread to the lungs. The disease was therefore metastatic, and care focused on comfort and symptom control rather than cure. In her own reflection, she described ignoring the enlarging mass until it had become painful, very large, and ulcerated. Her care remained palliative after the lung metastases were identified.

The absence of lymph-node surgery reflected the sarcoma pattern of spread, while the lung metastases confirmed that the cancer had already travelled through the bloodstream.