Abstract
Lymphomatoid granulomatosis (LYG) is a rare disease that expands invasively into vessels to the bilateral lung field. We report a very rare case of LYG that was pointed out as an asymptomatic solitary nodule. An 85-year-old woman who had been followed up after an operation for left renal cancer consulted our department for further examination of a solitary pulmonary nodule. The 23-mm lung nodule was in the right middle lobe. Cytokeratin 19 fragment, pro-gastrin-releasing peptide, and neuron-specific enolase were slightly elevated. Abnormal uptake was shown on PET-CT. She was diagnosed with suspected stage IA lung cancer, and we performed a right middle lobectomy. Histopathologically, the tumor was grade 3 LYG. She is now being followed up carefully, and there has been no evidence of recurrence during the 13-month period without postoperative chemotherapy.
