Despite the lack of information in the medical literature on endometrioid disease complicated by infectious and inflammatory diseases, past community-acquired pneumonia caused by the new coronavirus infection may cause purulent-septic complications of endometriosis. The effect of the virus on endometrioid cysts was hematogenous in this clinical case. The information presented in this report can help clinicians in conducting differential diagnostics in patients with a history of endometriosis and previous SARS-CoV-2, establishing a diagnosis, as well as determining the tactics of examination and treatment.