Adenoid Cystic Carcinoma of Esophagus with Lung Metastasis: Case Report.

Adenoid cystic carcinoma (ACC) is a malignant tumor originating in the salivary glands. It most commonly affects the salivary and lacrimal glands, with less frequent occurrences in the esophagus. Esophageal ACC (EACC) typically manifests in the middle or lower parts of the esophagus, with exceedingly rare instances in the upper part. Lung metastasis in EACC is uncommon, and understanding its clinical features and treatment strategies remains challenging. In this study, we present a case of ACC originating in the upper esophagus with lung metastasis. The patient, a middle-aged female, was admitted to the Department of Respiratory and Critical Care Medicine due to an esophageal mass discovered during physical examination that had been present for 4.5 years, along with a newly identified pulmonary nodule for 2 weeks. An X-ray barium meal revealed the presence of a benign esophageal cervical mass. Gastroscopy revealed elevated lesions below the esophageal inlet, and a pathological biopsy confirmed the diagnosis of EACC. The aim of this case report is to enhance understanding of this rare condition and improve clinicians' awareness of the disease. By providing details of the patient's diagnosis, clinical presentation, imaging features and pathological features, we aim to improve diagnostic accuracy and clinical management of similar cases in the future.