Case report
Positron emission tomography is moderately useful in the diagnosis of orbital metastasis

Choroidal metastasis is the most common intraocular malignancy in adults. A 37-year-old male patient presented with coughing. Thorax computerized tomography (CT) scan showed bilateral multiple nodules. The bronchoscopic biopsy pathology findings were compatible with squamous cell carcinoma. The patient was diagnosed with stage IV NSCLC and received 6 cycles of chemotherapy including cisplatin and vinorelbine. Positron emission tomography (PET) imaging revealed regression of old lesions but new metastatic lesions in the musculoskeletal system, intensive involvement in the orbital muscles of the right orbita, and increased FDG uptake (SUV_max: 3.6) in the posterior parts of the upper orbita. Palliative radiotherapy was performed for metastatic bone lesions. The patient complained of blurred vision two weeks after the PET imaging. Two amelanositic lesions in the upper temporal area in the right eye were detected in the examination of the eyes. Therefore, fundus fluorescein angiography and optical coherence tomography imaging were performed, and these lesions were accepted as metastasis. These lesions were in favour of metastasis.