SEER Inquiry System - View
Source 1: 2007 MP/H Rules
MP/H Rules/Histology--Ovary: Do the instructions for teratoma of the testis apply to teratoma of the ovary? See discussion.
I made a note in my ICD-O-3, from NAACCR webinar Feb 2011 (testis), that 'All adult (post-puberty) pure mature teratoma tumors are malignant and should be coded 9080/3'. Now I have an ovarian case with this diagnosis, and I can't find anything in the CAnswer Forum or SINQ to support that this should be coded /3. All the references in the pt's medical record seem to consider this a benign process. The slide from the NAACCR webinar seems to indicate that the info about this being malignant came from the I&R. Was this supposed to be specifically applied to testicular cases? Is this ovarian mature teratoma reportable or not? What if the primary site were testis? Interestingly, this pt has a hx of medullary ca of the thyroid in 2009. I see from SINQ that it would not be unheard of to see a thyroid primary present in a teratoma of the ovary. But those posts seem to indicate that there would be mention of a histology other than, or at least in addition to, the mature teratoma.
Mature teratomas in the ovary are benign (9080/0). For testis, mature teratoma in an adult is malignant (9080/3); however, mature teratoma in a child is benign (9080/0). With regard to the thyroid issue, from the information above, the medullary carcinoma in the patient's thyroid is clearly a separate event. According to our expert pathologist consultant, "thyroid tissue is one of the many tissue types that may be seen in teratomas. When the teratoma has exclusively or predominantly thyroid tissue the term struma ovarii is used … Adenoma or carcinoma of the thyroid type may be seen in this thyroid tissue. If medullary carcinoma were present in the thyroid tissue in the ovary/teratoma, there would be mention of it in the path report."