We present an interesting image of a painless growing mass of the right arm in a 76-year-old man. A musculoskeletal MRI of the right arm showed a 7.5 x 3-cm homogeneous, well-defined mass, elongated along the course of muscle fascias and independent of the adjacent bone. A core-needle biopsy was performed, and the diagnosis of low-grade follicular lymphoma was established. Intramuscular lymphoma should be integrated into the differential diagnosis of tumors surrounding neurovascular structures, alongside peripheral nerve tumors and soft tissue sarcoma. MRI and whole-body F-18-FDG PET/CT features provided useful information to refine differential diagnosis in this case.
Filipe Amândio Brandão Sanches Vong Martins
Sandrine Madeleine Suzanne Georgeon, Anthony Marchand, Bruno Emanuel Ferreira De Sousa Correia, Pablo Gainza Cirauqui, Li Tang, Sailan Shui, Stéphane Rosset, Lucia Bonati, Leo Scheller