Biliary obstruction secondary to duodenal follicular lymphoma with papillary involvement.

Duodenal-type follicular lymphoma is a clinical variant of follicular lymphoma located in the intestine, presenting as multiple small polyps. The estimated frequency is 1/7000 people and extraduodenal involvement is rare. It predominantly affects middle-aged women, although some cases of young patients have been published in the literature. They are usually located in the second periampullary portion of the duodenum. It is diagnosed incidentally or after performing an imaging test due to non-specific digestive symptoms (abdominalgia, diarrhea or hyporexia). The prognosis is usually favorable without specific treatment5.

Nakamura polyp, an extraordinarily rare finding.

The inflammatory myoglandular or Nakamura polyp is a very rare polyp, with about 100 cases having been described in the literature. It has specific endoscopic and histological characteristics, making its knowledge of it very important for its proper diagnosis. Its differential diagnosis with other types of polyps is of vital importance, both histologically and with respect to its endoscopic follow-up. We present the clinical case of a Nakamura polyp as an incidental finding in a screening colonoscopy.

Endoscopic ultrasound guided diagnosis of a retroperitoneal extra-gastrointestinal stromal tumor.

GIST tumors are mesenchymal tumors that are usually positive for the CD-117 marker. They present mostly at middle ages of life and although the most frequent locations are the stomach, small intestine and rectum/colon, they can appear in unusual places such as the retroperitoneum. The case that we present reflects the diagnostic process with imaging tests such as echo-endoscopy with puncture, of a retroperitoneal GIST tumor.

Cefditoren-induced hepatitis.

There are many daily antibiotic prescriptions, especially beta-lactams in trivial infections such as cystitis in young women. Many of these drugs carry an implicit probability of producing hepatotoxicity, manifested by a nonspecific general picture and elevated analytical transaminases. We must take it into account when making the differential diagnosis in the hepatotoxicity study and suspend it as soon as we recognize it.

Diarrhea secondary to intestinal infiltration secondary to renal epidermoid carcinoma.

Renal squamous cell carcinoma is a rare neoplasm in adults, but with an aggressive behavior. It is diagnosed in most cases in advanced stages. The invasion of the digestive tract by this type of tumor is rare, due to the anatomical arrangement of the colon, however, when it occurs, it carries a poor prognosis for the patient. Digestive endoscopy allows us to reach a definitive diagnosis since these patients usually present digestive manifestations, such as diarrhoea, digestive bleeding or abdominal pain.

Esophageal hyperkeratosis as an uncommon manifestation of gastroesophageal reflux disease.

We present the case of a 66-year-old woman with intermittent dysphagia and esophageal food impaction. The endoscopic examination showed an upper and middle esophagus with a diffuse circumferential, white, crackleware epithelium. Esophageal biopsies revealed acanthosis and papillomatosis with diffuse hyperkeratosis. High dose of Proton pump inhibitors was initiated with improvement of all symptoms 6 weeks later.