Cervical carcinoma metastasizing to fat forming solitary fibrous tumor-a case report with review of literature

A 62-year-old lady who was a known diabetic and hypertensive presented to a local hospital with complaints of post-menopausal bleeding of three weeks duration. She also complained of a dragging sensation in the lower abdomen. Per vaginal examination revealed an ulceroproliferative growth in the cervix with extra cervical spread. A biopsy was taken. With an outside report of non-keratinizing squamous cell carcinoma, patient was referred to our oncology unit. Clinical examination confirmed a stage IIIB cervical cancer. Magnetic resonance imaging (MRI) of pelvis and abdomen showed the cervical cancer infiltrating the parametriae, upper third of vagina and the bladder wall. In addition, the MRI revealed a well defined lobulated heterogeneous lesion in left anterior para renal space, which was radiologically considered as metastatic deposit. A right ovarian cyst was also detected radiologically. Patient was given chemotherapy and radiotherapy for cervical cancer. Following this the pararenal mass and ovarian cyst was excised. Based on histopathology and immunohistochemistry the pararenal mass was diagnosed as fat- forming (lipomatous) solitary fibrous tumor [SFT] containing foci of metastatic carcinoma. Ovarian cyst was a mature cystic teratoma. We are reporting this case because of its rarity and also to highlight the importance of adequate sampling and careful screening of slides so as to avoid missing relevant findings. Lipomatous SFT is a rare variant of SFT.There are only very few reports of SFT serving as the recipient in tumor to tumor metastasis. According to our knowledge this is the first reported case of cervical carcinoma metastasizing to lipomatous SFT.