Characteristics of Retained Foreign Bodies in the Tongue: A Retrospective Study of 35 Cases

There are only a few case reports of foreign bodies (FBs) in the tongue. Delayed diagnosis or misdiagnosis is commonly reported. The purpose of this study was to identify the demographic, clinical, and radiological features that might facilitate the diagnosis of retained FBs in the tongue.A retrospective case series was performed. Clinical and imaging data of patients with FBs in the tongue at Wuhan University Hospital of Stomatology were reviewed. The outcome variable was a preliminary, radiological, intraoperative, or pathological diagnosis. Covariates included age, sex, FB-related history, symptoms and signs, duration, and computed tomography (CT) imaging features. Descriptive statistics were computed for each study variable.Thirty-five patients were included. The sample's mean age was 54.5 ± 11.2 years, included 19 males (54.3%). Eighty percent of the patients reported FB-related history with a mean duration of 4 weeks. More than 70% of the patients presented with tongue swelling. Approximately half of the 35 cases were preliminarily misdiagnosed, and 15 of them were initially suspected to be tumors. After CT examinations, 33 of the 35 cases were diagnosed as FB. Characteristic CT imaging feature of the FB was a radiopaque line. Most FBs were located at the anterior two-thirds and marginal area of the tongue and in an oblique direction. The depth of FB was 0.61 ± 0.42 cm. The superficial ends of most FBs were close to the surface of the dorsum and the tongue margin.The possibility of a retained FB should be included in the differential diagnosis of a nonhealing wound or tongue enlargement when a radiopaque line is present on CT images of patients presenting with or without FB-related history. It may be easier to detect a FB in the tongue when a CT imaging postprocessing protocol, including thin-slice reconstruction and multiplanar reformation visualization and careful interpretation, is used.