Aim: Testicular germ cell tumors (TGCT) are solid neoplasms common in young adult men and an important cause of cancer-related deaths during this period. Revisions in histopathological classification and staging affect prognosis and treatment. The aim of this study was to analyze our TGCT cases, to review prognostic parameters, and their relationship between germ cell neoplasia in situ (GCNIS), intratubular and intertubular tumors. Material and Methods: In this study, Hematoxylin&Eosin-stained sections of 77 TGCTs were re-evaluated. The presence of GCNIS, intratubular and intertubular germ cell tumors were recorded. Histopathological classification and staging were revised based on the changes in the 8th edition of American Joint Committee on Cancer (AJCC). Results: The majority of the patients were diagnosed as seminoma (n=42), followed by mixed germ cell tumors (n=33) and spermatocytic tumors (n=2). Rete testis invasion in 30 cases, epididymal invasion in 6 cases, hilar soft tissue invasion in 10 cases, tunica vaginalis invasion in 1 case, spermatic cord invasion in 4 cases, and lymphovascular invasion in 22 cases were detected. Intertubular seminoma in 25 cases, intratubular carcinoma in 16 cases, and GCNIS in 73 cases were detected. Conclusion:The major criteria to determine treatment choices are histopathological diagnosis, pathological tumor stage, serum tumor markers and presence of metastasis. According to AJCC 8th edition, addition of hilar soft tissue invasion to staging has increased the number of our pT2 cases. Moreover, assuming discontinuous tumor invasion of spermatic cord by vascular invasion as pM1 has also increased the number of metastatic testis tumors.

Objective: The aim of this study is to determine the demographic and clinical findings of cases which have been operated for a brain mass and have metastasis, to analyse the histopathological findings, to draw attention to the molecular tests that are effective in the treatment of the primary tumour, and to compare our results with the literature data. Material and Methods: One hundred seventy cases diagnosed with brain metastasis tumour between January 2012-2021 were analysed retrospectively. The clinical findings and demographic information of the cases were recorded from the hospital information system. The diagnoses of the patients diagnosed with metastasis, the analysis of the cases with or without a primary tumour at the time of diagnosis, and the immunohistochemical staining applied to detect the primary metastasis were recorded. Results: Sixty-seven of the cases were female, and one hundred three were male.  The youngest case was 14, and the oldest case was 90 years old (Mean 55.6 ± 14).  While the clinical findings in 35 of the cases were solely headache, 41 patients also had at least one of the symptoms such as dizziness, seizure, weakness, and ataxia in addition to headache. The primary was unknown at the time of diagnosis of brain metastasis in 63 of the cases. There was a single focus in 107 cases, and multiple metastasis focus in 63 patients.  Among all cases, lung (84), breast (24) colorectal (15), kidney (9) metastases were the most common. Primary focus could not be detected in 2 of the cases (neuroendocrine carcinoma and adenocarcinoma) despite all imaging techniques as well as immunohistochemical findings. Conclusion: The possibility of metastasis is also present in cases with a single lesion and whose primary diagnosis is unknown, and histomorphological analysis become inevitable due to the increase in molecular examinations and the development of patient-specific treatment protocols. Besides, it should not be forgotten that the most common tumour-causing brain metastasis -whether or not the primary is known- is the lung. Kidney tumours may also present with metastasis without manifesting themselves.

All the patients presented to gynecology polyclinics with abnormal uterine bleeding either during the reproductive or the peri/ postmenopausal period underwent endometrial sampling to exclude endometrial pathologies. One endometrial pathology frequently encountered in the histopathological examination of these samples is Endometrial Polyp (EP); and it is important that they are recognized as they require a distinct treatment plan and can be associated with endometrial malignancies. Material and Methods: In this study, we investigated the demographic and clinical findings and concomitant malignancies of the cases diagnosed with endometrial polyps based on endometrial biopsy samples at Bezmialem Vakif University over a period of 7 years and compared our results with those in the literature. Results: Our study determined an EP prevalence of 19% and only 11 (0.65%) of the 1694 cases were found to have "adenocarcinomas" within/outside the polyp. Conclusion: Considering that EPs may be associated with malignancies, histopathological examination must absolutely be performed with adequate sampling.

The mixed epithelial and stromal tumor (MEST) family is comprised of adult cystic nephroma with a dominant cystic component and MEST with a dominant solid component. MEST is the rarely observed benign, biphasic tumor of the kidney with a mixed epithelial and stromal component. In the examinations of a 24-year-old male patient who presented with abdominal pain, grade-4 hydronephrosis was detected. In the microscopic examination of his nephrectomy specimen, there were tubular structures with cuboidal epithelium in different diameters within the ovarian stroma. The patient was diagnosed with MEST via morphological and immunohistochemical findings. We aimed at comparing the clinical and histopathological characteristics of our case, which we diagnosed with MEST, which is encountered in limited numbers in young men and has never been reported together with a nonfunctional kidney before, to the literature data.  Keywords: Mixed epithelial and stromal tumor, nonfunctional kidney, male.