Mucinous carcinoma of the breast: A case report and comprehensive literature review

Background

Mucinous carcinoma is a rare histologic subtype of breast cancer, accounting for 1–4 % of all cases. It predominantly affects older women and generally presents a favorable prognosis compared to other invasive breast cancers.

Case summary

We report the case of a 54-year-old woman presenting with a slowly enlarging right breast mass. Clinical and imaging examinations revealed a lobulated lesion in the lower outer quadrant of the right breast. Core needle biopsy confirmed the diagnosis of grade II mucinous carcinoma. The patient underwent mastectomy with sentinel lymph node biopsy, which was negative for metastasis. Histopathological examination confirmed a pure mucinous carcinoma. Postoperatively, the patient was referred for adjuvant radiotherapy.

Conclusion

This case highlights the importance of correlating imaging and histological features to ensure timely diagnosis of mucinous carcinoma and underscores its generally favorable outcome when appropriately managed.