Μυελοειδές καρκίνωμα θυρεοειδούς σαν τυχαίο εύρημα μετά από λοβεκτομή

PYRAMIDAL LOBE (PL) OF THE THYROID – CLINICAL IMPORTANCE

The PL represents the inferior part of the thyroglossal duct and is found in a 15 - 75% of the general population. It is located to the left, right or midline of the isthmus in 50%, 12 %, and 28 %, respectively. Its length ranges 3 to 60 mm (median, 25 mm). The PL may be affected by the same primary diseases (diffuses or focal) affecting the rest of the thyroid parenchyma. The involvement of the pyramidal lobe is more common in diffuse thyroid diseases, such as Hashimoto thyroiditis, Grave’s disease, multinodular goiter, while it is more rarely affected by focal thyroidopathy, including thyroid neoplasms (benign and malignant). During surgery, the anterior cervical region should be carefully investigated to avoid leaving residual thyroid parenchyma in-situ when complete resection of the thyroid gland is required. The surgeon should therefore be aware of the clinical anatomy of pyramidal lobe in order to properly recognize it during surgery and achieve its complete removal when a total/ near total thyroidectomy is required, as in patients with thyroid cancer.