A 43-year-old male presented to our hospital complaining of pyrexia and bloody sputum. Approximately 5 months earlier, he had undergone catheter ablation therapy for paroxysmal atrial fibrillation and was in good health without symptoms. Radiographic examinations revealed infiltration at the left lingula, suggestive of bacterial pneumonia. After antimicrobial drugs proved ineffective, transbronchoscopic lung biopsy was performed for a definitive diagnosis. A histopathological examination showed interstitial organization and thickening of alveolar septa with scattered hemosiderin-laden macrophages. Chest CT, employing the 3D-reconstruction method, clearly demonstrated left-upper pulmonary vein occlusion. We thus diagnosed congestive pulmonary infarction resulting from pulmonary venous occlusion as a postcatheter ablation complication. Practitioners should be aware of this relatively significant complication of current medical innovations.