Case Report: First report of PIK3CA-related overgrowth spectrum revealed by refractory chylorrhea after breast-conserving surgery: failed thoracic-duct ligation - Summary - MDSpire

Case Report: First report of PIK3CA-related overgrowth spectrum revealed by refractory chylorrhea after breast-conserving surgery: failed thoracic-duct ligation

  • By

  • Yue Wan

  • Peng Xu

  • Yu Zhang

  • Jing Xu

  • Baoxin Wang

  • Kaihua Zhao

  • June 23, 2026

  • 0 min

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Objective:

To report a case of chylorrhea after breast-conserving surgery linked to PIK3CA-Related Overgrowth Spectrum (PROS).

Approach:
    Key Findings:
    • Chylorrhea post-breast-conserving surgery is rare and can indicate underlying conditions.
    • Thoracic-duct ligation may exacerbate chylous drainage in cases linked to systemic disorders.
    • This case is the first reported instance linking PROS to chylorrhea after breast-conserving surgery.
    Interpretation:

    The findings suggest that refractory surgical complications may be due to underlying genetic conditions rather than solely anatomical issues.

    Limitations:
    • This case is a single report and may not be generalizable.
    • Further studies are needed to understand the relationship between PIK3CA mutations and chylorrhea.
    Conclusion:

    This case highlights the need for a multidisciplinary approach to manage refractory postoperative complications and the role of genetic testing in diagnosing conditions like PROS.

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