Primary Leiomyosarcoma of Suprahepatic Inferior Vena Cava with Metastases.

A 67-year-old female presented with shortness of breath, weight loss, abdomen, and back pain for 2 months. Ultrasound of the abdomen revealed multiple focal liver lesions. F-Fluorodeoxyglucose whole-body positron emission tomography/computed tomography revealed a hypermetabolic lesion in the suprahepatic inferior vena cava extending into the right atrium.

A Rare Case of TENIS Presenting with SVC Thrombus - Highlighting the Role of PET-CT scan.

Thyroglobulin-elevated negative iodine scan (TENIS) syndrome represents a significant diagnostic and therapeutic challenge. Highly sensitive imaging modalities are required to help in the localization of disease, treatment planning, and prognostication. When compared to other imaging modalities, F-18 fluorodeoxyglucose positron-emission tomography-computed tomography has superior sensitivity and specificity in localizing the disease in this subset of patients.