MediAI

  Beyond the Chest X-ray: How Nuclear Imaging Reveals the Hidden Burden of Sarcoidosis Gallium Scintigraphy, FDG PET/CT, and the Future of Precision Imaging in Systemic Granulomatous Disease Category: Nuclear Medicine | Molecular Imaging | Thoracic Radiology | PET/CT | Inflammatory Disease Keywords: Sarcoidosis, FDG PET/CT, Gallium Scan, Panda Sign, Lambda Sign, Nuclear Medicine, Granulomatous Disease, Molecular Imaging, Chest CT, Whole-Body Imaging Executive Summary Sarcoidosis is one of the most fascinating and challenging multisystem inflammatory diseases encountered in modern medicine. Although pulmonary involvement remains the hallmark of the disease, sarcoidosis is fundamentally a systemic granulomatous disorder capable of affecting virtually every organ, including the lymph nodes, skin, eyes, heart, liver, spleen, nervous system, and musculoskeletal system. The remarkable diversity of clinical manifestations frequently delays diagnosis and often leads clinicians through a...

Schwannoma Mimicking Metastatic Lymphadenopathy: The Critical Imaging Clues Every Radiologist Must Know When a cancer patient undergoes PET-CT and an FDG-avid axillary mass is discovered, the immediate concern is usually metastatic lymph node involvement. In daily radiology practice, increased FDG uptake is often interpreted as evidence of malignancy. However, this assumption can occasionally lead clinicians down the wrong diagnostic path. A particularly educational case involved a 76-year-old man with a history of nasopharyngeal carcinoma who presented with dysphagia and severe pain. PET-CT revealed an FDG-avid axillary lesion with an SUVmax of approximately 4.5, strongly suggesting metastatic lymphadenopathy. Yet the final diagnosis was something entirely different: Schwannoma. This case highlights one of the most important lessons in modern medical imaging: FDG uptake does not equal cancer. Understanding the radiologic features of schwannoma across ultrasound, CT, MRI, and PET-CT is...