Abstract
A 60-year-old woman presented for breast cancer screening. Computed tomography showed a 50-millimeter, isolated splenic mass. There were no other lesions in any other organs. A splenic malignant lymphoma was suspected. To confirm the diagnosis, a laparoscopic splenectomy was done. The histological findings revealed a non-caseating epithelioid cell granuloma similar to a sarcoidosis. However, further testing and clinical findings did not fulfill the diagnostic criteria for sarcoidosis ; nevertheless, the patient's findings were similar to those of sarcoidosis. Therefore, the patient requires careful long-term follow-up ; in particular, organs such as the heart and lungs require vigilant assessment. A case of splenic sarcoidosis without extrasplenic lesions is extremely rare. There have been only a few reported cases in Japan.
