2Kierownik: saxon J. connor MD, F.R.A.C.S Thoracic duct injuries are a rare complication of thyroid surgery. This report documents two cases of thoracic duct injury complicated by formation of chyloma following thyroid surgery. The injury was identified post-operatively and treated successfully. We review the diagnostic and therapeutic options and discuss their applicability to our patients. Key words: thyroidectomy, chyle leak, chyloma, thyroid cancer, complication Thyroid surgery is one of the most common procedures performed in endocrine surgery.Complications of this procedure are rare, however, their frequency can increase in thyroid cancer patients. Detailed knowledge of both the common and rare complications allows a surgeon to adequately inform their patient about the risks of this surgery. Such knowledge also allows appropriate preventative measures to be undertaken. The complications include hypoparathyroidism (1.7%), recurrent laryngeal nerve injury causing vocal cord palsy (1%), superior laryngeal nerve injury with subsequent creation of a higherpitched sound and swallowing disturbances (3.7%), haemorrhage with tracheal compression (1.2%), and wound infection (0,3%) (1). Case reports of rare complications, such as damage of the sympathetic trunk, thoracic duct or other structures in this area (such as large veins) are reported occasionally. These complications are often related to technical problems and neoplastic infiltration. CASE REPoRTS 1. A 63 year old lady presented to her general practitioner with pain in the neck radiat- PoLSKI PRZEGLĄD CHIRURGICZNY 10.2478/v10035-009-0039-4 2009 ing to both ears and associated with hoarseness. Physical examination revealed a hard nodule palpable in the left lobe of the thyroid. Ultrasound examination confirmed a 4 cm hypoechogenic nodule and a fine needle biopsy revealed papillary cancer. There was no significant past medical history and the patient, therefore, qualified for radical surgery in our department.The operation was carried out under general anaesthesia. The superior and inferior thyroid poles of the left lobe were ligated following visualisation of recurrent laryngeal nerve and parathyroids. Both lobes were removed en-bloc. During exploration, enlarged lymph nodes were found in the region of the left inferior thyroid artery. An intraoperative frozen section confirmed the diagnosis of papillary cancer with metastatic spread to the ipsilateral lymph nodes. The jugular vein and carotid artery were carefully dissected out and selective neck dissection was performed. No metastatic lymph nodes were identified on the contralateral side. A single drain was placed into the thyroid bed. The specimen was sent for histopathological evaluation that revealed 10 lymph nodes ranging from 0.1 to 1 cm in diameter all with features of reactive lymphadenitis.