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Sarcina sp. (Ss) infection is a rare cause of gastrointestinal disease, with only 66 cases reported worldwide. We present a case of a 56-year-old man with alcohol abuse, smoking, and chronic obstructive pulmonary disease who presented with upper gastrointestinal bleeding and decompensated cirrhosis. Endoscopy and biopsy revealed gastric ulcers with tetrad-shaped cocci consistent with Ss . After 32 days of hospitalization and broad-spectrum antibiotic therapy, both clinical and endoscopic improvement was observed. This case highlights the atypical presentation of this increasingly recognized infection and the importance of prompt diagnosis and supportive care., Competing Interests: Human subjects: Consent for treatment and open access publication was obtained or waived by all participants in this study. Comitê de Ética em Pesquisas da Universidade Federal de Uberlândia (CEP-UFU) issued approval NA. Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2025, Lima et al.)

Lymphangiomas are rare benign tumors that result from lymphatic vessel malformations and/or obstructions commonly on the neck and armpits, being rare in the retroperitoneal space. We report a case of a healthy 25-month-old male with a six-month history of abdominal distension and recurrent episodes of diarrhea who was clinically diagnosed with giardiasis. The complementary evaluation showed a cystic formation occupying the whole abdominal cavity and implanted at the abdominal retroactivity. The patient underwent videolaparoscopic surgery. At histopathological and histochemical examinations, the diagnosis of cystic lymphangioma was stated. The report presents a rare case of retroperitoneal lymphangioma, a condition that is frequently misdiagnosed due to its rarity., Competing Interests: Human subjects: Consent for treatment and open access publication was obtained or waived by all participants in this study. Research Ethics Committee of the Federal University of Uberlândia issued approval 82329724.8.0000.5152. The informed consent was waived as the participant is no longer in the hospital's care. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Morais et al.)