Imaging findings of a cutaneous B-cell lymphoma.

We report a case of a slowly growing primary cutaneous B-cell lymphoma of the right upper arm in an 81-old-year-old female. Although primary cutaneous lymphoma is the second most common group of extranodal non-Hodgkin lymphomas, reports on the potential value of imaging in the diagnosis are very scarce in the radiological literature. Although the dermatologist usually relies on clinical and histological findings for a correct diagnosis, MR imaging may be useful in local staging of the tumor, whereas 18F-fluorodeoxyglucose (FDG)-positron emission tomography (PET) is the imaging technique of choice for initial distant staging and follow-up after treatment.