[Retroperitoneal Fibrosis - on the Benefits of Trustworthiness in Everyday Practice]. / Retroperitoneale Fibrose ­ Fallbeispiel zur Glaubwürdigkeit von Patienten.

Retroperitoneal Fibrosis - on the Benefits of Trustworthiness in Everyday Practice Abstract. Despite negative radiology results, the described patient's back pain clearly had to be a somatic one - concluded by his primary care provider because of the patient's trustworthiness. The clinical presentation, histopathology of surgical excision and chemistry (IgG4) revealed the diagnosis of a retroperitoneal fibrosis. The symptoms as well as the fibrosis disappeared due to glucosteroid and rituximab therapy.

PET-Negative Gastrointestinal Stromal Tumors.

Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal malignancy of the gastrointestinal tract. PET/CT is a common diagnostic tool and is also used for therapy monitoring. GISTs typically show strong (18)F-fluorodeoxyglucose (FDG) uptake. Here we present two cases of GIST with unusually low/negative FDG uptake. FDG negativity does not preclude the diagnosis of a GIST.