Cranial Nerve Disorder Diagnosis

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A 62-year-old man presented with a progressive right abduction deficit. Magnetic resonance imaging (MRI) showed a right cavernous sinus mass, suspected to be metastatic. Positron emission tomography-computed tomography (PET-CT) revealed the right cavernous sinus lesion and multiple metastases (short arrows), with a lung mass presumed to be the primary neoplasm (long arrow), shown in these images through the A) and B) brain and B) and C) chest. Note the normal high metabolic activity of the A) brain.

Source: Martin TJ, Corbett JJ. Practical Neuroophthalmology; 2013.