Source 1: WHO Class Female Reproductive Organs
Notes: 4th ed.
Source 2: Subject matter expert
Reportability--Ovary: Is ovarian mucinous borderline tumor of intestinal type with microinvasion reportable? If reportable, what is the histology? See Discussion.
4/18/17 Right ovary and fallopian tube, salpingo-oophorectomy: mucinous borderline tumor of intestinal type with microinvasion; greatest dimension 24.5 cm. Left fallopian tube and ovary, salpingo-oophorectomy: Benign ovary with multiple benign Mullerian inclusions. Benign fallopian tube with multiple paratubal cysts. Per pathology: pT1a pNx.
For an ovarian mucinous borderline tumor, the term "microinvasion" is not an indication of malignancy according to the WHO classification of tumors, and our expert pathologist consultant agrees. Therefore, borderline mucinous ovarian tumor with microinvasion is not reportable. Low malignant potential/borderline ovarian tumors are defined by the pathology of the primary tumor in the ovary, and microinvasion there, or invasion in implants does not change that diagnosis. The only exception is when the lymph nodes are positive for malignancy, the case is reportable. If the lymph nodes are positive for mucinous borderline tumor, the case is not reportable.