This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
A female patient with breast cancer presenting with altered sensorium. The following MRI suggests: 
Select and explain. 
A. Herpes simplex encephalitis, B. Gliomatosis cerebri, C. Limbic encephalitis, D. Metastasis
C: Limbic encephalitis
Answer: C: Limbic encephalitis 
Explanation: The epidemiology of limbic encephalitis mimics that of the underlying malignancy. Tumours which can result in limbic encephalitis include: small cell carcinoma of the lung (classic cause); testicular germ cell tumors; thymic tumours; breast cancer; ovarian carcinoma; haematologic malignancies; gastrointestinal malignancie Clinical presentation: Clinical presentation typically causes sho-term memory loss and mental status changes. Seizures and psychosis have also been repoed . Radiographic features: MRI: High T2 signal without enhancement. Appearance is similar to herpes simplex encephalitis, and changes are most evident in the mesial temporal lobes. Bilateral involvement is most common (60%). PET scan: Can show increased FDG uptake . Differential diagnosis: Herpes simplex encephalitis - acute time course, presence of fever.