RESUMO
Preoperative radiological assessment of parotid tumours represents a crucial step in the planning of a parotidectomy in order to avoid post-operative facial nerve paralysis. The purpose of this study is to determine the reliability of the novel 'M-line' in predicting the facial nerve position and compare it to various radiological methods in the same context. 66 patients whom had underwent parotidectomy for parotid tumours from January 2012 to February 2021 were analyzed. Parotid tumour location were identified using the retromandibular vein, facial nerve line, Conn's arc, Utrecht line and the 'M'-line were compared to the intraoperative location of parotid tumours.The 'M'-line is a novel hypothetical line (drawn between the lateral surface of the mandible to the lateral border of the mastoid process) used to identify the location of the facial nerve radiologically. The 'M-Line' and other methods of radiological assessments were associated with statistical significance in predicting if the parotid tumours were superficial or deep to the facial nerve (p-value < 0.05).The 'M-line' had demonstrated a sensitivity of 73.6% and 92.3% specificity.It had also yielded the highest accuracy (77.3%) in the prediction of the parotid tumour location in relation to the facial nerve. While the radiological lines represented by the Retromandibular vein,facial nerve line,Utrecht line and Conn's arc were statistically significant in predicting the location of the parotid tumour in relation to the facial nerve, the M-line was the most accurate and sensitive predictor in our study.The M-Line is a potentially useful tool to predict the location of the facial nerve in relation to a parotid tumour.
RESUMO
Empyema necessitans is a rare complication of untreated pleural space infections. Untreated empyema that spontaneously burrows through the parietal pleura can present with a subcutaneous abscess. In the following case report, we present a 55 year old male who presented with an intermittent left chest mass later to be diagnosed as empyema necessitans. The patient suffered from a hemothorax treated by tube thoracostomy three years prior. The patient had been seen several times and no mass could be appreciated. The patient was diagnosed with empyema necessitans on computed tomography and treated with a left thoracotomy. Empyema necessitans can develop if pleural infections are left untreated. We present an unusual presentation of this rare complication. Empyema necessitans should be kept in the differential diagnosis of patients with left chest masses or abscesses.
