Related Experiment Video
Updated: Jan 23, 2026

Multifocal Electroretinograms
Published on: December 4, 2011
Single stage hand assisted laparoscopic and trans thoracic excision of multifocal paraaortic and cardiac
Kirsten Jie Ying Ong1, Alexander Shaw2, Richard Wadsworth3
1Yong Loo Lin School of Medicine, National University of Singapore (NUS).
Abstract:
A 26-year-old male, with a family history of Paraganglioma Syndrome 4 (PGL4) presented with an 18-month history of paroxysmal headaches, a one-month history of frequent diaphoresis, anxiety attacks and unintentional weight loss of one stone in 2 months. Physical examination and vital parameters were normal. Laboratory studies showed significant elevation of plasma normetanephrines and 3-methoxytyramine while DNA molecular analysis confirmed pathogenic mutation in the SDHB gene and genetic transmission of PGL4. Imaging studies demonstrated a left para-aortic mass in the mid-abdomen and a mediastinal paraganglioma between the root of aorta and origin of the main pulmonary artery, encroaching the right ventricle. After adequate alpha blockade, the patient underwent a combined sequential hand-assisted laparoscopic resection of the abdominal tumour followed by midline sternotomy and resection of the second lesion at the root of the aorta, complicated by the need for emergency cardiopulmonary bypass due to perforation of right ventricular wall.
Related Concept Videos
Base Excision Repair
The first step of...
Base Excision Repair
Nucleotide Excision Repair
Nucleotide Excision Repair
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Thoracic Aorta
The Thoracic Cage: Sternum
The sternum is the elongated bony structure on the anterior side of the thoracic cage. It consists of three parts: the manubrium, the body, and the xiphoid...

