BACKGROUND Composite pheochromocytoma/paragangliomas are very rare tumors composed of ordinary pheochromocytoma paragangliomas associated with neurogenic tumors. Several hereditary susceptibility disorders are known to be associated with pheochromocytoma/paragangliomas such as multiple endocrine neoplasia type 2 (2A or B). To the best of our knowledge, only four cases of composite pheochromocyt...

Carotid body tumors are rare benign tumors of the neck but dangerous because their vascular nature and position between Internal and External carotid arteries quite sitting on the carotid bifurcation. Carotid body tumours are paragangliomas, tumors, originating from paraganglionic bodies of autonomous nerve system of the embriological neural crest and increasing gradually. Despite their gradual...

Paragangliomas are a type of neuroendocrine tumour with catecholamine secretion outside the adrenal medulla. These tumours frequently found in para-aortic region, which makes them difficult to manage laparoscopically. We herein present case report three patients paragangliomas superior position. All cases had symptoms release uncontrolled episodic hypertension and their successfully removed by ...

Extra-adrenal paragangliomas constitute 10 % or less of phaeochromocytomas/paragangliomas. Even rarer is the occurrence of paragangliomas outside the usual distribution of paraganglionic tissue. We report a case of extra-adrenal paraganglioma occurring in the small intestine mesentery in a 65-year-old man. To our knowledge, there are only seven case reports of paraganglioma occurring in this no...

BACKGROUND Paragangliomas are benign neoplasms of neuroendocrine origin. It is estimated that from 20% to 50% of these tumors are familial. Mutations in the succinate dehydrogenase (SDH) gene family have been found to be responsible for a significant percentage of familial paragangliomas. METHODS A 33-year-old man who was found to have 3 synchronous primary tumors including a catecholamine-se...

Background Paragangliomas are rare neural crest tumors that can manifest in the head and neck as either functional or more commonly as nonfunctional lesions. Paragangliomas of the infratemporal fossa are exceedingly rare, with no more than a handful of documented cases. Like other tumors of this space, surgical management is challenging on account of complex anatomy and nearby critical structur...

We explain how to exploit Rost’s theory of Chow groups with coefficients to carry some computations of cohomological invariants. In particular, we use the idea of the “stratification method” introduced by Vezzosi. We recover a number of known results, with very different proofs. We obtain some new information on spin groups and on PGL4.

A weak version of the Ihara formula is proved for zeta functions attached to quotients of the Bruhat-Tits building of PGL3. This formula expresses the zeta function in terms of Hecke-Operators. It is the first step towards an arithmetical interpretation of the combinatorially defined zeta function.

Paragangliomas arise from the extraadrenal neuroendocrine system. They are locally aggressive tumors, causing adjacent invasion, bone destruction and compression related symptoms. We present a 35-years-old woman with a peculiar paraganglioma lacking all these features, and strictly located within the jugular vein. Differential diagnosis is detailed since other entities could have dissimilar cli...

Background: Tumors of the paraganglionic system represent a distinct, albeit uncommon, clinical entity characterized by catecholamine hypersecretion and hemodynamic instability; initial pathologic examination often cannot predict benign vs malignant behavior. An analysis of the clinical outcome of patients with known malignant tumors may serve to enhance the initial evaluation and therapeutic p...