Focal Segmental Glomerulosclerosis Preceding Type 2 Papillary Renal Cell Carcinoma

Renal cell carcinoma (RCC) is the predominant renal malignancy in adults. Of the four general subtypes, papillary renal cell carcinoma (P-RCC) is the second most common and can be subdivided into type I, type II, and a mixture of type I and II. Focal segmental glomerulosclerosis (FSGS) is the most common glomerulopathy at all ages, and it can be seen as a paraneoplastic syndrome. RCC, in general, is known to present with many paraneoplastic syndromes, and glomerulopathies are among these. Rarely, RCC and glomerulopathies may overlap in the same patient. Here, we report a 58-year-old male with a past medical history of FSGS and chronic kidney disease (CKD), stage III, who was found to have an incidental renal mass that was later diagnosed as type II P-RCC. The histology showed pseudostratified tumor cells with an eosinophilic cytoplasm that formed papillary configurations and displayed areas of necrosis. The prior FSGS diagnosis exhibited segmental sclerosis, refractory tufts, and capillary membrane wrinkling. A period of 1.5 years elapsed between the diagnosis of the glomerulopathy and the malignancy. The tumor was found to be at stage TIb. To our knowledge, this may be the first reported case of usual-type FSGS as paraneoplastic glomerulopathy (PG) preceding P-RCC. Because FSGS only sparingly affects the kidney and is a common glomerulopathy in adults, it is reasonable to complete comprehensive diagnostic studies and commence medically necessary treatment, especially in the background of other renal comorbidities. These preexisting comorbidities may be associated with malignancy very early in its course. The probability of RCC-associated paraneoplastic glomerulopathy is low, which means an already incidentally found renal mass may conceal a serpentine paraneoplastic syndrome. A more developed understanding of these manifestations can lead experienced clinicians to suspect and possibly uncover an insidious RCC before it advances

Histopathologic study of pathergy test in behçet′s disease

Background: The pathergy test (PT) is important in the diagnosis of Behçet′s disease (BD). However, misinterpretation of the test might cause false-positive or false-negative results. Therefore, immunopathologic and histopathologic tests are recommended with PT. Aims and Objectives: The aim of this study is to determine histopathologic findings of positive pathergy reaction at BD. Materials and Methods: This study was performed on 23 patients with BD. All patients were in active period of the disease. After 48 h from the injection, biopsy was performed on positive pathergy lesions. Results: Of the specimen from positive PT lesions of patients with BD, nine revealed mixed type inflammatory cell infiltration (39.1%), two revealed lobular panniculitis without vasculitis (8.7%), two revealed neutrophil rich infiltration (8.7%), and five revealed lymphocyte rich infiltration (21.7%) at the subcutaneous tissue. Mixed type inflammatory cell infiltration (43.4%), endothelial swelling and thickening (17.3%), erythrocyte extravasation (26.0%), perivascular cell infiltration (13.0%), lymphocytic vascular reaction (8.6%), lymphocytic vasculitis (13.0%), and leukocytoclastic vasculitis (21.7%) were detected in dermis by histopathologic examinations. There was no statistically significant difference between histopathologic findings and sex, family history, and systemic involvement except uveitis. Conclusion: This is an exceptional study since it is the first study that determines subcutaneous tissue findings of positive pathergy reaction in Behçet patients. In our study, uveitis was found to be statistically significant in the patients who had vasculitis in dermis. It can be a clue for prediction of disease severity and course. Further, studies that include wide number of patients will better illuminate the correlation between subcutaneous tissue findings and disease severity and clinical course