[Non-functioning retroperitoneal paraganglioma]. / Paraganglioma no funcionante retroperitoneal.

Extra-adrenal pheochromocytoma or paraganglioma are rare, usually benign tumours, which clinical behaviour varies in function of whether they are able to secrete vasopressor hormones. The case of a 66 year-old male with non-functional retroperitoneal paraganglioma (chemodectoma) accidentally found with an echography is presented here. The paper analyzes the most relevant features from a pathological, clinical, evolutive, diagnostic and therapeutic point of view.

[Bladder adenocarcinoma of urachal origin. A rare tumor]. / Adenocarcinoma vesical de orígen uracal. Un raro tumor.

With the description of this new case of urachal adenocarcinoma in the vesical cupula we provide a review on the clinical, pathological and immunohistochemical aspects of this rare tumour, as well as a diagnostic and therapeutical approach. Its subepithelial infiltrant nature delays discovery and denotes both an insidious evolution and poor prognosis. Mucinoid production, nodes pattern and certain immunohistochemical substances as well as abnormalities in the cell's DNA content are attributes of this entity. Only surgery, either partial or exeresis, is effective since this is a radioresistant and dubiously chemosensitive tumour.

[Solitary extramedullary plasmocytoma of the nasal cavity]. / Plasmocitoma extramedular solitario de cávum.

A case of Extramedullary Plasmacytoma of nasopharynx is reported in a 41 years old man. The presenting symptom was bilateral nasal obstruction. Multiple Myeloma was excluded. The treatment was surgical excision and postsurgical radiotherapy. At present the patient is well.