GPT and glycogen storage disease VI: Once the diagnosis of OMM is confirmed, a whole-body PET scan and computed tomography are typically recommended as they are instrumental in differentiating primary disease from a clinically occult metastatic disease.10 Additionally, comprehensive tumor staging is crucial for head and neck contrast-enhanced CT, chest radiography, and liver function tests (to detect elevated aspartate aminotransferase/alanine aminotransferase).