Giant gastric leiomyosarcoma: a rare case report

Abstract

Leiomyosarcoma is a rare tumor of smooth muscle origin, most commonly seen in retroperitoneum. It is usually seen after the 5th decade equally among women and men. Among the visceral organs, it is most commonly seen in the uterus and constitutes 1% of malignant tumors of the stomach. Here, a case of giant leiomyosarcoma located in the stomach was discussed in the light of the literature. A 74-year-old female patient underwent wedge resection in the general surgery clinic for gastric tumor. Macroscopic examination of the material revealed a soft nodular lesion measuring 14x10x8.5 cm. The lesion was submucosal and extended to the muscularis propria. Histopathological examination of the lesion revealed a cellular proliferation of spindle cells with eosinophilic cytoplasm. Mitosis, pleomorphism and necrosis were observed in these cells. Immünohistochemical study revealed positive staining with SMA, desmin and vimentin, negative staining with DOG-1, CD117. Thus, the patient was diagnosed as leiomyosarcoma. Although gastric leiomyosarcoma is very rare, it should be kept in mind in the differential diagnosis of submucosal tumoral lesions, especially gastrointestinal stromal tumor (GIST). In these tumors, immünohistochemical study is very useful in differentiation from GIST.

Keywords

• Leiomyosarcoma
• stomach
• tumor of smooth muscle origin

Dev gastrik leiomyosarkom: nadir bir olgu sunumu

Abstract

Leiomyosarkom en sık retroperitonda görülen düz kas orijinli nadir bir tümördür. Genelde 5. dekattan sonra kadın ve erkeklerde eşit oranda görülür. Visseral organlar arasında en sık uterusta izlenmekte olup, mide malign tümörlerinin %1’ini oluşturur. Burada mide yerleşimli dev bir leiomyosarkom olgusu literatür eşliğinde tartışıldı. 74 yaşında kadın hasta, gastrik tümöral lezyon nedeniyle genel cerrahi kliniğinde wedge rezeksiyon uygulandı. Materyalinin makroskopik incelemesinde 14x10x8,5 cm ölçülerinde yumuşak kıvamlı nodüler bir lezyon saptandı. Lezyon submukozal yerleşimli olup muskularis propriaya da uzanım göstermekte idi. Lezyonun histopatolojik incelemesinde eozinofilik sitoplazmaya sahip iğsi hücrelerin sellüler bir proliferasyonu görüldü. Bu hücrelerde mitoz, pleomorfizm ve nekroz izlendi. Yapılan immünhistokimyasal çalışmada SMA, desmin ve vimentin ile pozitif boyanma DOG-1 ve CD117 ile de negatif boyanma saptandı. Bu bulgular eşliğinde olguya leiomyosarkom tanısı verildi. Mide yerleşimli leiomyosarkomlar oldukça nadir görülmekle beraber submukozal tümöral lezyonların, özellikle de gastrointestinal stromal tümör (GİST)’ün , ayırıcı tanısında mutlaka akılda tutulmalıdır. Bu tümörlerin GİST’ten ayırımında immünhistokimyasal çalışma oldukça yararlıdır.

Keywords

• Leiomyosarkom
• mide
• düz kas orijinli tümör

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