Introduction: Carcinoma of the fallopian tube is a rare pelvic malignancy accounting for only 0.3 to 1.1% of all gynaecological cancers with less than 1500 cases reported in the  literature [1,2]. Primary fallopian tube carcinoma isprovisionally misdiagnosed as ovarian carcinoma due to its rarity and symptom overlap.

Case Report: We present the case of a 55 years old female whopresented with complaints of an abdominal mass. After imaging and examination,she was clinically diagnosed as a left adnexal mass most probably of ovarian origin. During diagnostic laparotomy, an adnexal mass with hemoperitoneum was noted. Total abdominal hysterectomy with bilateral salpingo-oophorectomywith lymph node dissection was done and sent for histopathological examination. On gross examination, both the ovaries were uninvolved and tumour masseswere seen in both fallopian tubes, larger in the left tube.After extensive sampling and microscopic examination, a histological diagnosis of papillary serous cystadenocarcinoma of the fallopian tube was given. 

Conclusion: In conclusion, a case of primary fallopian tube carcinoma, although rare should be taken as a possibility for any adnexal mass. Early clinical suspicion followed by prompt investigations will lead to early diagnosis and a better survival. 

Keywords: Primary; Fallopian Tube Malignancy; Papillary Cystadenocarcinoma.