Extraventricular neurocytoma

Differential diagnosis in this case would include the following entities:

• Anaplastic oligodendroglioma. The principal differential diagnosis, as this lesion can also manifest with multiple calcifications, bone remodeling, and lack of perilesional edema. Contrary, this type of neoplasm tends to have coarse and larger calcifications and it's typically encountered in middle-aged adults.
• Chondrosarcoma. The presence of rings and arcs calcifications and bone destruction raised the possibility of chondrosarcoma. Also, the T2 hyperintense regions resembling the cartilaginous matrix favored this option. However, it is very rare for this type of tumor to present as an intracranial mass, likewise in a young patient. 
• Grade III meningioma. Cystic components are infrequent in this type of lesion, and enhancement is usually more significant and homogeneous. 
• Gangliocytoma / ganglioglioma. Ordinarily seen in children and young adults, these tumors can have a similar clinical presentation as in this case. Nevertheless, they have a more homogeneous radiological appearance and no bone resorption.
• High-grade astrocytoma. This neoplasm tends to occur in patients between 40 to 50 years and very rarely shows calcifications and bone resorption.