Unusual magnetic resonance imaging findings of brain and leptomeningeal metastasis in lung adenocarcinoma: A case report

Figure 1 Results of pathologic diagnosis and cerebrospinal fluid cytology. A: H&E staining, magnification 100×, demonstrated abnormal epithelioid cell nests in the left frontal lesion; B: Cerebrospinal fluid (CSF) cytology revealed malignant cells in the CSF.

Figure 2 76-year-old male with brain and leptomeningeal metastases. Magnetic resonance imaging (3.0 T) demonstrated a predominately T₂/FLAIR hyperintense gyriform mass in the left frontal lobe (A: T₂WI; B: Axial FLAIR), which is associated with minimal peripheral edema, mild restricted diffusion (C: Diffusion-weighted image), and avid contrast enhancement (D: Non-contrasted Axial T₁WI; E: Sagittal T₁WI after gadolinium administration). Leptomeningeal lesions were also observed (black arrow), (F: Axial post contrast).