Cutaneous extra nodal lymphoma relapse: A case report and review of literature.

Introduction: Cutaneous lymphomas represent a unique group of lymphomas. Cutaneous lymphomas are the second most frequent extra nodal involvement; gastrointestinal involvement being the most frequent (Malkan et al. [1]). To the best of our knowledge few cases of cutaneous relapse of Non-Hodgkin Lymphoma (NHL) have been reported where there was an absence of primary cutaneous involvement.

Case Presentation: A case study of a 70-year-old woman who was referred for an excisional biopsy of a lesion on her left cheek in 2017. She had previously been diagnosed with NHL in 2009; disease involved the right groin lymph nodes. The patient completed a course of chemotherapy and was in remission. An excision of the lesion on the left upper cheek confirmed low-grade follicular lymphoma. A PET scan was performed after the histology from the lesion was confirmed which demonstrated moderate fluorodeoxyglucose (FDG) uptake in left cheek, left external iliac lymph nodes and left tonsil consistent with recurrence of lymphoma.

Discussion: The majority of relapses of NHL occur in the first 2 years after the completion of treatment. Extra nodal lymphomas comprise 24-48 percent of cases. The reason for multifocal extra nodal lymphoma or preferential involvement of specific extra nodal sites at recurrence is not clear Extra nodal involvement involving skin accounts for 10 percent of cases. NHL typically relapses in the same involvement sites. First line treatment for solitary lesions includes surgical excision, antibiotics and radiotherapy.

Conclusion: Disease relapse was not present in the primary involvement site. Furthermore, there was a cutaneous relapse where there was no primary cutaneous disease. Treatment involved systemic therapy for this patient given the nodal involvement found on the PET scan.