Background and Objectives: Tenosynovial giant cell tumors (TSGCTs) are benign soft tissue tumors that are divided into localized- and diffuse-type tumors, according to the World Health Organization classification of soft tissue tumours. The diffuse-type TSGCT sometimes behave aggressively and poses treatment challenges especially in patients with neurovascular involvement. Symptomatic patients who are not good candidates for surgery due to high morbidity risk may benefit from medical therapy. Objectives: Drugs that target programmed death ligand 1 (PD-L1) are among a new generation of medical therapy options, which, recently, have been explored and have displayed promising results in various cancer types; therefore, we aimed to investigate the PD-L1 status of TSGCTs as a possible therapeutic target. Materials and Methods: We assessed the PD-L1 status of 20 patients (15 men and 5 women, median age = 39 years) that had been diagnosed with TSGCTs in a single institution, between 2018 and 2020. The patients had localized- (n = 7) and diffuse-type (n = 13) TSGCTs. Formalin-fixed paraffin-embedded (FFPE) blocks were retrospectively retrieved from the pathology department. An immunohistochemical analysis was performed in sections of 3 micron thickness from these blocks. Results: Seventy-five percent of our patients with TSGCTs were immunopositive to PD-L1 staining. Conclusions: Taking into consideration the high positivity rate of PD-L1 staining in TSGCTs, PD-L1 blockage may be used as a valuable medical treatment for TSGCTs; however, further studies are needed.

Parvovirus B19 infection is usually self-limiting in immunocompetent individuals. Twenty-five percent of infected individuals are completely asymptomatic during infection, with 50% of them presenting flu-like symptoms and the remaining patients presenting erythema infectiosum, arthralgia, or arthritis. More rarely, transient aplastic crisis is seen in individuals with chronic haemolytic disorders. Chronic pure red cell aplasia and aplastic anaemia may also be observed in immunocompromised patients. There is sufficient evidence in the literature suggesting that B19 infections can also cause a spectrum of liver diseases, ranging from elevated transaminase levels to acute hepatitis, fulminant liver failure, and even chronic hepatitis. This case report discusses a patient with acute parvovirus infection and newly diagnosed autoimmune hepatitis (AIH) and the role of this viral infection in the disease.

Schwannomlar periferik veya kranyal sinir kılıf hücrelerinden köken alan, çoğunlukla asemptomatik olan benign tümörlerdir. Ele gelen kitle veya insidentaloma gibi basıya bağlı semptomlar gösterebilen nadir ve yavaş büyüyen tümörlerdir. Sıklıkla baş, boyun ve ekstremitelerin fleksör yüzlerinde yerleşen Schwannom'un tanısı genellikle radyolojik görüntüleme bulguları ve patognomonik mikroskobik ve immünohistokimyasal özellikleri ile konulur. Burada karın yan duvarında ele gelen kitle şikayeti ile başvuran 31 yaşındaki kadın hastayı sunuyoruz.

Aim: Lipomas are benign tumors, and generally present as small lesions. However, giant lipomas are less frequent. There are only a few studies regarding the surgical treatment of giant lipomas. Marginal or wide resection is usually performed; however, there is no standard surgical approach. The aim of this study was to evaluate clinical results after surgical treatment of giant lipomas and to present a differential diagnosis of lipomatous lesions. Material and Methods: A total of 42 cases (24 female, 18 male) admitted to our clinic between 2015 and 2020 due to giant lipoma with at least 10 cm dimensions were included in this study. A preoperative biopsy was performed for all cases. All patients were undergone wide excision followed by postoperative histopathological examination. Results: The mean age was 57.5±12.9 years. The median follow-up was 35 months. Anatomic localization was thigh in 16 (38.1%) patients, shoulder in 7 (16.7%) patients, hip in 5 (11.9%) patients, back in 4 (9.5%) patients, arm in 9 (21.4%) patients, and the iliac region in 1 (2.4%) patient. Wide resection was performed, and final pathology was consistent with lipoma in all cases. There was no complication except in one patient who had transient neuropraxia after removing a giant lipoma at the proximal femur. At the latest follow-up, all cases were asymptomatic with no recurrence. Conclusion: Preoperative biopsy and wide resection should be preferred for the diagnosis and treatment of giant lipomas. Wide resection may prevent a recurrence. Routine follow-up is necessary to detect possible malign transformation.

Aim: The grade of the tumor is essential for planning the treatment strategy in soft-tissue sarcomas (STS). The goal of this study is to determine magnetic resonance imaging features related to histopathological grade and aggressiveness of STS. Material and Method: This retrospective single-center study involved preoperative contrast-enhanced MRI examinations of 64 patients with STS. MRI findings evaluated were; heterogeneity, necrosis, hemorrhage, and relationship with surrounding tissue in T1-weighted (T1W), T2-weighted (T2W), and T1W post-contrast sequences of the lesion. Histological grade was determined with the Fédération Nationale des Centres de Lutte Contre Le Cancer (FNCLCC) grading system, and the aggressiveness of the lesion was measured with the Ki-67 index. Results: Sixty-four patients (mean age 45.5±21.6, M/F ratio 34/30) with STS were included. 33 (51.6%) patients graded as FNCLCC grade 3. On MRI examinations, the absence of necrosis was significantly associated with FNCLCC grade 1 and a low Ki-67 index (p