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Small-Intestinal Metastasis from Lung Carcinoma.
Naotaka Ogasawara1, Satoshi Ono1, Tomoya Sugiyama1
1Department of Gastroenterology, Aichi Medical University School of Medicine, Nagakute, Japan.
Case Reports in Gastroenterology
|May 9, 2022
Summary
A rare case of lung carcinoma metastasizing to the small intestine was diagnosed in a 62-year-old man. Immunohistochemistry confirmed the lung origin of the small intestinal tumor, highlighting diagnostic challenges.
Area of Science:
- Oncology
- Gastroenterology
- Pulmonology
Background:
- Small intestinal metastasis from lung carcinoma is rare.
- Accurate diagnosis of metastatic disease requires comprehensive evaluation.
Observation:
- A 62-year-old man presented with abdominal pain and imaging revealed a left abdominal tumor and a right lung tumor.
- Endoscopic evaluation identified a jejunal ulcer, and biopsy confirmed poorly differentiated carcinoma.
- Immunohistochemical staining (TTF-1+, CK7+, CK20-) suggested a non-gastrointestinal origin.
Findings:
- The patient was diagnosed with stage IVB lung carcinoma with small intestinal metastasis.
- Positron emission tomography confirmed widespread metastatic disease.
- Pathological examination was crucial in differentiating primary from metastatic small intestinal tumors.
Implications:
- This case underscores the importance of immunohistochemistry in diagnosing rare metastatic patterns.
- Early and accurate diagnosis of lung cancer metastasis to the small intestine is critical for appropriate patient management.
- Further research into the mechanisms of small intestinal metastasis from lung cancer is warranted.
