Collision tumor: a colonic adenocarcinoma and a gastric adenocarcinoma.

Background: Collision tumors are defined as the juxtaposition of two histologically distinct tumors, which form a single mass, without histological mixing of the two tissues. They are extremely rare, especially in the digestive tract.

Clinical Presentation: An 81-year-old patient was admitted for anemia, diarrhea and palpable abdominal mass.

Splenic metastasis from gastrointestinal neoplasms: a review.

Spleen metastases from solid tumours are rather exceptional, especially for those located in the digestive tract. Although these lesions are usually associated with multivisceral disease at terminal stage, several cases of isolated lesions have also been described in the literature. Diagnosis of spleen lesions associated with multivisceral disease rarely influences patient's outcome.

Macroscopic endoscopic lesions in microscopic collagenous colitis: double case report and review of the literature.

Collagenous colitis is a cause of chronic diarrhea of incompletely elucidated origin, defined by normal laboratory tests, a normal endoscopic appearance of colonic mucosa and specific microscopic inflammatory features on colonic biopsies. We report two cases of macroscopic endoscopic lesions observed in patients suffering from chronic diarrhea, whose biopsies confirmed a diagnosis of collagenous colitis and who were successfully treated in that setting, achieving clinical and endoscopic remissions. By means of a literature review, we summarize what is known about collagenous colitis.