The clinical and pathological findings are reported concerning a 73-year-old woman with progressive metastatic carcinoma of the left breast, who developed interfollicular Hodgkin's disease within the right cervical lymph nodes. Metastatic carcinoma and Hodgkin's disease were present concurrently as a "collision tumor' in the lymph nodes examined. To the best of the authors' knowledge, this is the first description of a collision tumor with these particular histologic components in this tissue. The factors influencing the coexistence and the order of appearance of the two pathologies in the present case remain unknown.

Guillain-Barré syndrome (GBS) is an acute demyelinating polyradiculoneuropathy normally associated with a preceding infection, but sometimes it can be linked to a subjacent malignancy. We report an unusual case of GBS occurring as the first clinical manifestation of an esophageal adenocarcinoma in a 65-year-old patient. A GBS neuropathy of undetermined origin may be associated with an underlying tumor and esophageal cancer has to be considered in the differential diagnosis.