Spinal astrocytoma - A mass with T1: isointense to hypointense, T2: hyperintense, T1 C+ (Gd): vast majority enhance (patchy enhancement) is located eccentrically within the cord, They may be exophytic, and even appear largely extramedullary. They usually have poorly defined margins. Peritumoral oedema, Intratumoural and peritumoral cysts are present. Unlike ependymomas, haemorrhage is uncommon.
Spinal cord metastasis - usually well-defined and typically produce cord expansion over several segments - T1: hypointense. T2 hyperintense. prominent oedema commonly surrounds the tumour nodule. T1 C+ (Gd): avid homogeneous enhancement (ring enhancement in this case).
Spinal ganglioglioma - typically involve long segments of the spinal cord. Eccentric in location. Approximately half (46%) of these tumours contain tumoral cysts - T1: the mixed signal intensity due to the dual cellular elements of the tumour and is a unique finding among spinal cord tumours. T2: high intensity, surrounding oedema is uncommon. T1 C+ (Gd): most demonstrate patchy enhancement, however up to 15% cases may demonstrate no enhancement.
Spinal arachnoid cyst -| Radiopaedia.org - follow the intensity of CSF and their walls are generally not visible, they may not be identified unless the cord is displaced - Spinal arachnoid cysts are benign central canal lesions. On MRI they appear as masses with CSF-like signal (low signal on T1, high signal on T2 with no post contrast enhancement). The wall of an arachnoid cyst can not be appreciated in MRI.
This case demonstrated well the loss of marrow signal (especially on the T1W images) due to diffuse metastatic disease, in this case prostate cancer. Spinal metastases is a vague term which can be variably taken to refer to metastatic disease to any of the following: vertebral metastases (94%) may have epidural extension intradural extramedullary metastases (5%) intramedually metastases (1%) http://radiopaedia.org/articles/spinal-metastases
Spinal arteriovenous malformations (AVMs) are characterised by arteriovenous shunting with or without a true nidus, and includes both arteriovenous fistulae and arteriovenous malformations. Spinal AVMs may be classified as intramedullary and extramedullary (80%) 1 and further divided into 4 angiographic types, with additional sub types 2-3 (please refer to spinal AVM classification). http://radiopaedia.org/articles/spinal-arteriovenous-malformations