Renal Clear Cell Carcinoma with Unknown Primary: Is It Real Entity or Just Hypothesis?

Renal cell carcinoma (RCC) is a common type of cancer, and about 25% of patients are diagnosed at an advanced stage. Bone metastasis is common in RCC, but instances of bone metastases without a primary kidney tumour have rarely been reported. Here, we report a case of a 56-year male patient who presented with extensive bone metastases.

Risk of Malignancy Using the Diagnostic Categories Proposed by the World Health Organization International System for Reporting Pancreaticobiliary Cytopathology.

Background: The World Health Organization (WHO) proposed an updated reporting system for pancreaticobiliary cytology, which moves low-grade malignancies to "positive for malignancy" group and serous cystadenoma to "negative for malignancy" group. The WHO system also created two new categories, namely, pancreatic neoplasia-low grade (PaN-Low) and pancreatic neoplasia-high grade (PaN-High), which includes neoplastic mucinous cysts and stratifies them according to their cytologic atypia. The risk of malignancy (ROM) of the new categories of the WHO system needs to be defined.