Biomedical subjects

Z Kinkor

Publications and source records attributed to Z Kinkor.

8 recordsLinked to original sources

PubMed2001

Small cell variant of renal oncocytoma--a rare and misleading type of benign renal tumor.

Here we report 3 cases of renal oncocytoma with a dominating small cell component arising in adult women. These 3 cases of small cell variant of renal oncocytoma were found among 134 cases of oncocytomas of the kidney in the routine and consultation files of the authors. Two of 3 cases were initially thought to be a malignant tumor by the referring pathologists. In all 3 cases minor areas of the tumors, which were identical to the classical renal oncocytomas were found. The small cell areas were arranged in a characteristic organoid pattern different from all the known types of the renal benign and malignant tumors. We summarize all morphologic, immunohistochemical, and ultrastructural features of this unusual oncocytoma variant with regard to its differential diagnosis. Int J Surg Pathol 9(3):215-222, 2001

Adenoma, Oxyphilic↗

PubMed2001

[Oncocytoma of the kidney--morphologic variation in 102 cases].

From the collection of 2500 cases of renal epithelial tumors in our files, 102 renal oncocytomas were analyzed for size, multifocality and a morphologic spectrum of the growth pattern. The size of the tumors ranged from 1.5 to 13 cm in diameter, with a mean of 6.3 cm. Three cases were multifocal, four cases were combined with another primary renal tumor (1x angiomyolipoma, 1x conventional renal carcinoma, 2x papillary renal cell carcinoma). A central fibrosis or a scar was noted in 13 cases, and there was a gross area of hemorrhage in 11 cases. In 4 cases extensive necroses were recognized. Histologically, an alveolar pattern was noted in 70 cases. A tubular pattern was revealed in 31 cases and an unusual tubopapillar ("glomeruloid") pattern was noted in one case. Foci of atypical nuclei were identified in 58 cases. In 4 oncocytomas broad areas of clearance of the oncocytes were found. Psammoma bodies were recognized in 9 tumors and foci of ossification were present in 4 cases. Intracellular and extracellular hyaline globules were noted in two cases. Renal oncocytoma has a variable morphologic spectrum, and its diagnosis should be based on an analysis of structural and cytologic features. Differential diagnosis of renal oncocytomas with various tumors of the kidney which contain granular cytoplasm is discussed. These tumors with granular cytoplasm include conventional renal cell carcinomas, chromophobe cell carcinomas, and rare examples of papillary renal carcinomas.

Adenoma, Oxyphilic↗

PubMed2001

Erdheim-Chester disease. A case report.

A 63-year old man had a history of diabetes insipidus, arthralgias and myalgias, weight loss, relapsing fever and malaise. Increased uptake of Tc-99m was found predominantly in distal antebrachia, in distal femurs and in both trochanters and tibias on the bone scintigraphy. The chest radiograph showed reticulonodular pattern and the high resolution computed tomography (HRCT) scans revealed diffuse infiltrative lung disease with small multiple nodules and widening of interlobular septs. Videothoracoscopic lung biopsy and biopsy of tibial lesion were perfomed. The histopathologic examination proved non-Langerhans cell histiocytosis-Erdheim-Chester disease. Treatment with prednisone reduced the pain and fever and improved the vital capacity of the lungs while the changes in the lungs and bones remained unchanged.

Biopsy↗

PubMed2001

[Severe pulmonary involvement in Erdheim-Chester disease (case report)].

Presented is a typical case of Erdheim-Chester disease (ECD) wherein the severe pulmonary manifestation led to an open lung biopsy and eventual morphologic recognition of the nonspecific clinical symptoms. The pulmonary involvement is described in almost 20% of cases and is prognostically unfavourable. About 20 cases of Erdheim-Chester disease were published and more than half of them had lethal outcome. The ECD affecting seriously lungs appears as non-specific interstitial lung disease and usually does not enter the broad clinical differential diagnosis. A detailed bibliography with special attention to the pulmonary involvement by this enigmatic disease is presented.

Diagnosis, Differential↗

PubMed1999

Oncocytic myoepithelioma and pleomorphic adenoma of the salivary glands.

Twenty oncocytic myoepitheliomas (MEs) and pleomorphic adenomas (PAs) were composed of interlacing fascicles of swollen spindle-shaped or/and epithelioid oncocytic myoepithelial cells showing intense finely granular immunoreactivity with anti-mitochondrial antibody. Focal vacuolation of the cytoplasm of oncocytic myoepithelial cells and their gradual transition into sebaceous metaplasia were observed in 3 cases. Another unusual feature found in 5 cases was the presence of slit-like adenomatoid spaces lined with double-layered oncocytic myoepithelium closely resembling Warthin's tumour. The nuclei of oncocytic cells were characterized by enlargement, hyperchromasia and polymorphism, which should not be confused with malignancy. Oncocytic change in myoepithelial cells in MEs and PAs can cause pitfalls in the differential diagnosis of salivary gland tumours. We describe some unusual histological features associated with onococytic metaplasia in benign myoepithelial cell-derived salivary gland tumours, hoping to help to avoid the overdiagnosis of malignancy.

Adenoma, Pleomorphic↗

PubMed1999

[Sarcomatous chromophobe cell renal carcinoma. 2 case reports].

Chromophobe cell renal carcinoma is a relatively rare primary tumour of the kidney. We present two cases of sarcomatoid transformation in this type of renal cell carcinoma. Described transformation in chromophobe renal cell carcinoma has been reported previously only in four publications. We present a very unusual aggressive recurrence of one of our cases and introduce the first case of sarcomatoid carcinoma arising from chromophobe cell renal carcinoma of the kidney with rhabdomyoblastic differentiation.

Adenocarcinoma↗

PubMed1997

Ossifying fibromyxoid tumor of soft parts: a report of 17 cases with emphasis on unusual histological features.

Ossifying fibromyxoid tumor of soft parts is an unusual benign neoplasm, with a tendency for local recurrence. Its typical microscopic appearance is that of a multinodular proliferation of round to spindle shaped cells separated by fibrous bands in which bone formation is often seen. Herein, we present the clinicopathologic features of 17 examples of this tumor with particular emphasis on some unusual histopathologic features that may place pitfalls in the diagnosis of this tumor, including satellite micronodules, mucinous microcysts, absence of myxoid areas, crush artifact, multiple microcalcifications, epidermoid cysts, atypical chondroid differentiation with binucleate lacunar cells, pericytic growth pattern, and malignant change. Awareness of these unusual morphologic features should lead to a search for areas displaying the more typical features of ossifying fibromyxoid tumor to arrive at a correct diagnosis.

Adolescent↗

PubMed1995

Desmoplastic cellular blue nevi.

We describe five cases of cellular blue nevus (CBN) accompanied by an abundant desmoplastic reaction. The cells within the desmoplastic regions reacted strongly immunohistochemically with antibodies to S-100 protein and HMB-45 and were negative to antibodies to smooth muscle actin and desmin, providing evidence that the abundant collagen deposits were the product of the nevus cells. The microscopic picture of desmoplastic CBN can differ considerably from that of common CBN, and differential diagnosis is discussed.

Actins↗