Cardiophrenic lymph node metastasis as the sole presentation of high grade serous ovarian carcinoma.

Key Clinical Message: Cardiophrenic metastasis is typically a late stage manifestation of ovarian high grade serous carcinoma. Here we present a case where this was the sole presentation of this disease. This case challenges our current understanding of the natural course of ovarian high grade serous carcinoma. Abstract: Ovarian cancer is typically described to spread from its primary site within the fallopian tubes or ovaries into the peritoneal cavity and beyond with cardiophrenic lymph node involvement being considered a late stage disease process. Here we present the case of a lady in her 60s where increased metabolic activity of the cardiophrenic lymph node was picked up in the investigation of an adenocarcinoma of the lung. Post-thoracoscopic resection histopathological analysis of this lymph node showing an epithelial structure with positive immunohistochemical markers PAX8, WT1, ER, and p16 with a p53 wild type-pattern were the sole presenting features of a high grade serous ovarian carcinoma, that was otherwise undetectable by radiological or hematological screening. Only histopathological analysis after modified radical hysterectomy in gynae-oncological fashion were able to identify a 4 mm lesion within the left fallopian tube. This case questions our current understanding of the natural history of ovarian carcinomas.