Cutaneous lymphoid hyperplasia and marginal zone B-cell lymphoma following vaccination.

Atypical lymphoid infiltrations arose within the influenza inoculation sites of two adult female patients. One patient developed a low-grade cutaneous marginal zone B-cell lymphoma (MZL) that was responsive to local excision and radiation therapy despite spread to a distant cutaneous site. The second patient's clinical course was characterized by a locally aggressive, histologically reactive inflammatory reaction responsive only to radiation therapy after multiple failed attempts at surgical resection.