<prompt> Investigation of choice for meningeal carcinomatosis in CNS:NE-CTPETSPECTGd-MRI  <response>: D i.e. Gd-MRI Investigation of choice for meningeal carcinomatosis is Gd enhanced MRIQ especially for detection of focal spread, bulky disease and metastases from solid tumor. Demonstration of tumor cellstumor markers in CSF is definitive often considered gold standard; but has suboptimalmoderate overall sensitivity, and is more sensitive in detecting diffuse leptomeningeal involvement from hematological malignancy 