RESUMEN
We report a rare case of spontaneous regression (SR) in an elderly untreated patient with multiple solitary plasmacytoma (MSP). Diagnosis of MSP was confirmed through surgical resection of the left nasal cavity mass and subsequent biopsy of the right humerus. The patient was considered ineligible for chemotherapy due to poor performance status. At 3-month post-diagnosis, the patient's condition worsened with deteriorating bone lesions and emergence of a new serum monoclonal protein. However, these clinical findings completely disappeared at 6 months, and positron emission tomography-computed tomography at 1 year confirmed complete metabolic remission. Notably, peripheral blood lymphocyte counts were inversely correlated with tumor progression and remission. Pathological re-evaluation of the initial biopsy specimens revealed programmed cell death protein 1 (PD-1) expression in tumor-infiltrating CD8+ T cells. In addition, tumor cells were infected with Epstein-Barr virus (EBV) but were negative for programmed cell death ligand 1 (PD-L1) expression, which is the most potent immune escape mechanism in tumor cells. While the mechanism underlying SR remains unclear, our findings suggest that host immune response as well as EBV infection may contribute to SR. Further studies are needed to elucidate the clinicopathologic mechanisms of tumor regression in plasma cell neoplasms.
Asunto(s)
Infecciones por Virus de Epstein-Barr , Herpesvirus Humano 4 , Plasmacitoma , Humanos , Plasmacitoma/patología , Plasmacitoma/diagnóstico , Infecciones por Virus de Epstein-Barr/complicaciones , Masculino , Anciano , Tomografía Computarizada por Tomografía de Emisión de Positrones , Regresión Neoplásica Espontánea , Receptor de Muerte Celular Programada 1/metabolismo , Remisión Espontánea , Femenino , Linfocitos T CD8-positivos/inmunología , Linfocitos T CD8-positivos/metabolismoRESUMEN
Heerfordt's syndrome is a rare subtype of sarcoidosis and features a combination of facial palsy, parotid swelling, and uveitis, associated with a low-grade fever. Cases with two of three symptoms are called "incomplete Heerfordt's syndrome." Heerfordt's syndrome involving other cranial nerve symptoms is relatively rare. We herein report a case of incomplete Heerfordt's syndrome presenting with trigeminal nerve palsy and a reversed halo sign, a rare manifestation of pulmonary sarcoidosis. The histological diagnosis following a biopsy of the parotid gland and endobronchial ultrasound-guided trans-bronchial needle aspiration of the mediastinal lymph nodes was sarcoidosis. The symptoms and lung lesions improved after corticosteroid therapy.