Intrabilary obstruction by colorectal metastases.

Intrabiliary colorectal metastases are rare. We present a case of an 84-year-old man who developed obstructive jaundice secondary to intrabiliary growth of colorectal metastases. The patient presented with three weeks of jaundice and significant weight loss in the preceding months. The patient's background included metastatic colorectal carcinoma, with a previous right hemicolectomy and left hepatectomy for liver metastases. A MRCP showed an obstruction of the biliary tract transitioning at the ampulla. Histology confirmed a malignant adenocarcinoma. When compared to the patient's previous resected colorectal liver metastases, morphology and immunohistochemistry was consistent with colorectal metastases. This case highlights the importance of differentiating a new intraductal papillary neoplasm from a colorectal metastasis. Correctly identifying these lesions requires the use of MRCP and ERCP, as well as immunohistochemistry. This is a priority for clinicians to ensure appropriate therapy.