The negative impact of storage reservoirs on the environment has been well documented, but it appears that under certain circumstances these reservoirs can also help to protect biodiversity. The distribution of adult dragonflies and damselflies was studied in relation to eight environmental variables, in an upland storage reservoir and its feeder rivers located in South-East Poland (East-Central Europe). A total of 25 species were recorded, including 22 in the reservoir. Submerged and floating plants, width of the shallow littoral zone and the water movement/current were found to be the key drivers of the species distribution (pCCA, NMDS). Five species (Ischnura elegans, Sympetrum sanguineum, Platycnemis pennipes, Calopteryx splendens and Erythromma viridulum) were responsible for over 70% of the dissimilarities between the riverine and reservoir sites (SIMPER). In addition, Ischnura elegans, Orthetrum albistylum and Calopteryx virgo were distinguished as the indicator species (IndVal analysis) for the upland river-reservoir hydrological system. Our results highlight some design features of reservoirs that may help to maintain the diversity of odonates, as well as many other groups of aquatic organisms, as the former are well-known indicators of general biodiversity.

A case of a 59-year-old male patient with gastric neuroendocrine tumor which was misdiagnosed as adenocarcinoma, is presented. Herein, primary diagnosis was made due to the similarity of endoscopic pictures of both diseases and dues to the inappropriate interpretation of a small biopsy sample. The patient was qualified for endoscopic submucosal dissection. Microscopic examination of whole lesion, supplemented by immmunohistochemical reactions (chromogranin A, synaptophysin, cytokeratins 7 and 20, Ki67) revealed gastric neuroendocrine tumor (NET) G2. The lesson learnt is that to provide effective treatment to the patient, it is necessary to use all available methods to make a proper diagnosis and to distinguish the suspected disease from others with similar features.

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Hobnail hemangioma is a rare, benign, vascular lesion with peculiar but commonly misleading morphology, located mostly on the extremities or trunk, and affects young and middle-aged adults with a slightly male predominance. A new typical case in a 17-year-old girl is presented. A single, small, painless skin lesion appeared in an early childhood on the lateral part of the right thigh, and was linked with scratching a previous pigmented lesion. Microscopic examination of the completely removed lesion revealed typical morphology. Prominent endothelial cells were podoplanin-negative and CD34-positive. There was no recurrence after four years follow-up.

Gastric lipomatosis is a condition characterized by the presence of multiple lipomas or diffuse mature adipose tissue infiltration within the gastric wall. The diffuse form is thought to be an extremely rare, with only few described cases. The lesion may be asymptomatic or associated with symptoms and signs depending on location and size. Treatment depends on clinical presentation, range and complications. In a symptomatic disease, it should be surgical, but conservative treatment is preferred for asymptomatic and solitary lesions. Among diagnostic methods, computed tomography and magnetic resonance imaging are thought to be the most valuable.