What are the most common primary tumors that result in hemorrhagic metastases to the central nervous system (CNS)?

The most common primary tumors causing hemorrhagic metastases to the CNS are melanoma, renal cell carcinoma, thyroid carcinoma, and choriocarcinoma. Key diagnostic features include hyperdense lesions on CT due to hemorrhage and heterogeneous enhancement on MRI. Clinically, these tumors often present with acute neurological deficits due to bleeding. A common pitfall is mistaking these lesions for primary CNS hemorrhages or vascular malformations.