Journals / Çukurova Anestezi ve Cerrahi Bilimler Dergisi / 2026 / Cilt: 9 Sayı: 3

Primary Gastric Extraosseous Osteosarcoma with Extensive Multivisceral Invasion: A Case Report

Yaygın Multivisseral İnvazyonlu Primer Gastrik Ekstraossöz Osteosarkom: Olgu Sunumu

Yunus Kaycı(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0000-0001-8502-4367
Serdar Gümüş(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0000-0001-7629-9369
Uğur Topal(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0000-0003-1305-2056
İshak Aydın(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0000-0002-6366-2461
Zülfi Zahidli(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0009-0006-2302-6475
Çağla Duru(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0009-0009-5185-5176
Kivilcim Eren Ates(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0000-0002-4951-8703
Cem Kaan Parsak(ÇUKUROVA ÜNİVERSİTESİ, TIP FAKÜLTESİ)0000-0002-6515-8365
Pages
765–770
Publication Date
2026-09-30
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Keywords: Gastrointestinal Hemorrhage; Osteosarcoma; Sarcoma; Soft Tissue Neoplasms; Stomach Neoplasms.

📌 3 Key Takeaways

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Objective & Hypothesis:Introduction: Extraosseous osteosarcoma (ESOS) is a rare soft-tissue sarcoma that produces osteoid without any anatomical relationship to the skeleton.
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Key Findings & Data:Case Presentation: A 78-year-old man with six months of nonspecific gastrointestinal symptoms was found to have a 14×16×21 cm gastric mass invading the left hepatic lobe, pancreas, duodenum, and omentum.
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Conclusion & Impact:Keywords: Gastrointestinal Hemorrhage; Osteosarcoma; Sarcoma; Soft Tissue Neoplasms; Stomach Neoplasms.
🔬Design:Olgu Sunumu
📍Scope:Comprehensive Sample
⚙️Variables:Gastrointestinal Kanama · Mide Neoplazmları · Osteosarkom

Abstract

Introduction: Extraosseous osteosarcoma (ESOS) is a rare soft-tissue sarcoma that produces osteoid without any anatomical relationship to the skeleton. Primary gastric ESOS is exceptionally rare and presents major clinical, radiological, and pathological diagnostic challenges. Case Presentation: A 78-year-old man with six months of nonspecific gastrointestinal symptoms was found to have a 14×16×21 cm gastric mass invading the left hepatic lobe, pancreas, duodenum, and omentum. Endoscopic ultrasound–guided fine-needle aspiration was non-diagnostic. After massive upper gastrointestinal hemorrhage with hemodynamic instability, life-saving emergency laparotomy with R2 debulking was performed. Histopathology and SATB2-positive immunohistochemistry confirmed high-grade extraosseous osteosarcoma. PET-CT showed no distant or skeletal lesion, supporting a primary gastric origin. Conclusion: Primary gastric ESOS may present as a giant, multivisceral mass with non-diagnostic biopsies. Awareness, multidisciplinary evaluation, and timely surgery are critical, as resectability remains the principal prognostic determinant. Keywords: Gastrointestinal Hemorrhage; Osteosarcoma; Sarcoma; Soft Tissue Neoplasms; Stomach Neoplasms.

Özet

Giriş: Ekstraossöz osteosarkom (EOS), iskelet ile herhangi bir anatomik ilişki olmaksızın osteoid üreten nadir bir yumuşak doku sarkomudur. Primer gastrik EOS son derece nadirdir ve önemli klinik, radyolojik ve patolojik tanı güçlükleri ortaya koymaktadır. Olgu Sunumu: Altı aydır nonspesifik gastrointestinal semptomları olan 78 yaşındaki erkek hastada; sol hepatik lob, pankreas, duodenum ve omentumu invaze eden 14×16×21 cm boyutlarında gastrik kitle saptandı. Endoskopik ultrasonografi eşliğinde yapılan ince iğne aspirasyonu tanısal olmadı. Hemodinamik instabiliteyle seyreden masif üst gastrointestinal kanama gelişmesi üzerine, hayat kurtarıcı endikasyonla acil laparotomi ve R2 debulking uygulandı. Histopatolojik inceleme ve SATB2 pozitif immünohistokimyasal boyama, yüksek dereceli ekstraossöz osteosarkom tanısını doğruladı. PET-BT'de uzak veya iskeletsel lezyon saptanmaması, primer gastrik kökeni desteklemiştir. Sonuç: Primer gastrik EOS, tanısal olmayan biyopsilerle birlikte dev, multivisseral bir kitle olarak karşımıza çıkabilir. Rezektabilite başlıca prognostik belirleyici olduğundan; farkındalık, multidisipliner değerlendirme ve zamanında uygulanan cerrahi büyük önem taşımaktadır. Anahtar Kelimeler: Gastrointestinal Kanama; Mide Neoplazmları; Osteosarkom; Sarkom; Yumuşak Doku Neoplazmları.

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Cite This Article

Kaycı, Y., Gümüş, S., Topal, U., Aydın, İ., Zahidli, Z., Güneş, H., Duru, Ç., Ates, K. E., Parsak, C. K. (2026). Primary Gastric Extraosseous Osteosarcoma with Extensive Multivisceral Invasion: A Case Report. Çukurova Anestezi ve Cerrahi Bilimler Dergisi, Cilt: 9 Sayı: 3, 765–770. https://doi.org/10.36516/jocass.1943879

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