This is an open-label whole-body PET/CT study for investigating the value of 68Ga NEB PET imaging in the diagnosis and evaluation of lymphatic disorders including lymphedema, lymphangioma, lymphangioleiomyomatosis, plastic bronchitis, lymphadenopathy caused by rheumatoid arthritis, etc.

No fasting, hydration or other specific preparation was requested on the day of imaging.

Patients for lymphatic drainage disorders imaging underwent whole-body PET/CT acquisitions 20-40 min after subcutaneously injected into first and second interdigital spaces of both feet or hands of 74-111 MBq (2-3 mCi) 68Ga-NEB with each bed position lasted for 2 min.

A MIM workstation was used for post-processing. The visual method was used to evaluate the lymphatic system, including the morphology and the distribution of the lymphatic system. Semiquantitative methods were applied for image analysis.

Inclusion Criteria:

• Must be able to provide a written informed consent; Males and females, ≥18 years old； Diagnostic CT or MRI suggesting a diagnosis of lymphatic system lesion(s). In suspicion of lymphedema, lymphangioma, lymphangioleiomyomatosis, plastic bronchitis, lymphadenopathy caused by rheumatoid arthritis, etc.

Exclusion Criteria:

• Females planning to bear a child recently or with childbearing potential; Known severe allergy or hypersensitivity to IV radiographic contrast； Inability to lie still for the entire imaging time because of cough, pain, etc. Inability to complete the needed examinations due to severe claustrophobia, radiation phobia, etc.

Concurrent severe and/or uncontrolled and/or unstable other medical disease that, in the opinion of the investigator, may significantly interfere with study compliance.