Abstract
RATIONALE: Partial anomalous pulmonary venous connection (PAPVC) is a rare congenital vascular anomaly that often remains undetected in asymptomatic patients. While most cases are hemodynamically insignificant, failure to recognize PAPVC preoperatively may lead to intraoperative misidentification and surgical complications. Coexistence of PAPVC and lung cancer, particularly on the ipsilateral side, is extremely rare and poses challenges for surgical decision-making. PATIENT CONCERNS: A 55-year-old man, asymptomatic and uncharacteristic in his past medical history, presented with an abnormal shadow in the left lower lobe during a regular checkup. DIAGNOSES: Pulmonary sarcomatoid carcinoma, partial anomalous pulmonary vein connection. INTERVENTIONS: The patient underwent video-assisted thoracoscopic left lower lobectomy without surgical correction of the PAPVC. OUTCOMES: The patient remained in good health at the 14-month follow-up. LESSONS: In patients with ipsilateral PAPVC and no evidence of hemodynamic compromise, anatomical lobectomy alone may be a safe and effective surgical option without the need for venous correction.