A case of orbital malt lymphoma with breast involvement detected by 18FDG-positron emission tomography

A diagnosis of right lacrimal gland mucosa-associated lymphoid tissue (MALT) lymphoma was made in a 71-year-old woman. Histological examination showed dense atypical lymphocytic infiltration. The tumour cells had small dark nuclei with abundant clear cytoplasm (top left, haematoxylin and eosin, ·200) and there was strong immunoreactivity for CD20 (·200; top right). The patient was referred for staging with 2-(F) fluorodeoxyglucose positron emission tomography (F-FDGPET) after surgery of the orbital lesion. Head/neck, thorax and abdomen computerised tomography had been performed previously, with no significant findings. Head and neck magnetic resonance imaging showed diffuse high signals in both, especially in the right inferior palpebral area, with no discrete mass, and with cervical lymphadenopathy, particularly on the right side; all nodes were