The Risk Malignancy Index (RMI) is one of the simplest assessments that can assist in diagnosing and determining the prognosis of benign and malignant adnexa masses. Epithelial carcinoma is the most common type of about 90% of ovarian cancers.  As many as 35-40% of the epithelial type are serous and 6-10% are musinosum.This study aims to compare the picture of RMI value on the incidence of ovarian cancer serosum and musinosum type. This study was cross sectinal comparative study from medical records of ovarian cancer patients at obstetrics and gynecology section in DR M Djamil Hospital Padang from January 1st, 2017 until December 31st, 2017. The population was found one hundred and forty of patients with ovarian cancer and only one hundred and twenty nine of patients met the inclusion criteria and there were no exclusion criteria. Next RMI value is calculated based on RMI 1 formula, result is described in tabular form and data processing with SPSS program. Conclucion of this study is there were no differences in age distribution, ascites occurrence and age of menopause in serous and musinosum ovarian cancer. There is a difference in Ca, 125 levels in serous with musinosum ovarian cancer which also contribute to the high value of RMI. The mean value of patients‘s RMI in serous type ovarian cancer is higher than the mean value of RMI in patients with type Musinosum ovarian cancer. Keywords: index of risk malignancy, menopause, ultrasonography, anatomic pathology, serous ovarian carcinoma

Risk Malignancy Indeks (RMI) adalah salah satu penilaian sederhana yang mampu membantu dalam mendiagnosis dan menentukan prognosis massa adneksa jinak dan ganas. Carcinoma epitelium merupakan jenis yang terbanyak sekitar 90% dari kanker ovarium. Sebanyak 35-40% dari tipe epitelial adalah serosa dan 6-10 % adalah musinosum. Penelitian ini bertujuan untuk perbandingan gambaran nilai RMI pada kejadian kanker ovarium tipe serosum dan musinosum. Penelitian dilakukan dengan metode Cross sectional comperatif study dari rekam medik pasien kanker ovarium di bagian obstetri dan ginekologi RSUP DR M Djamil Padang pada 1 Januari 2017-31 Desember 2017. Didapatkan populasi 140 pasien kanker ovarium dan hanya 129 pasien yang memenuhi kriteria inklusi dan tidak terdapat kriteria eklusi. Selanjutnya nilai RMI dihitung berdasarkan rumus RMI 1, hasil digambarkan dalam bentuk tabel dan dilakukan pengolahan data dengan program SPSS. Kesimpulan penelitian ini tidak terdapat perbedaan distribusi umur, kejadian ascites dan usia menopause pada kanker ovarium serosum dan musinosum. Terdapat perbedaan kadar Ca,125 pada kanker ovarium serosum dengan musinosum yang juga berperan terhadap tingginya nilai RMI. Nilai rata-rata RMI pada pasien kanker ovarium tipe serosum lebih tinggi dari nilai rata-rata RMI pada pasien kanker ovarium tipe Musinosum.