Diagnosis, combined treatment, and long-term follow-up of a thymoma patient

Thymic neoplasms account for 20 – 25% of primary mediastinal tumors. Nonspecific clinical symptoms are often associated with delayed diagnosis of thymoma, leading to a distinctive problem of late diagnosis. Nowadays, surgical removal of the tumor is the method of choice for thymoma treatment. Combination treatment is indicated in the case of an unresectable tumor. Modern therapy (various combinations of anticancer drugs) helps reduce neoplasm size, stop metastasis, and maintain good quality of life in patients with thymoma.Aim. The presented clinical case of type B3 thymoma (with invasion into surrounding organs and metastatic pleura) is characterized by a long asymptomatic period of the disease, the onset of symptoms after suffering COVID-19 (COronaVIrus Disease 2019) and successful long-term polychemotherapy. The causes of late diagnosis, as well as insufficient oncologic vigilance in evaluating the results of laboratory and instrumental tests, are discussed based on this clinical case.Conclusion. A correct diagnosis, as well as successful treatment, requires a multidisciplinary approach involving physicians from different specialties – general practitioners, oncologists, surgeons, radiologists, and morphologists.