Vitamin B12 deficiency causes haematological and neurological diseases. Subacute combined degeneration (SCD) of the spinal cord is characterized by degeneration of the posterior and lateral columns. We report two cases of SCD induced by nitrous oxide (N2O) anaesthesia. In both cases magnetic resonance imaging (MRI) of the spinal cord showed symmetric, reversible changes in the posterior columns, correlating well with patients' symptoms.

During five entomological field expeditions between 2008 and 2019, butterfly speciemens were collected in Oman, and a total of 492 specimens of 46 species were documented. Faunistic and distribution data for each species is presented, along a short overview of the physical geography of Oman and biogeographical notes of the butterfly fauna. With 30 figures.

CD4+/CD56+ hematodermic neoplasm, formerly known as blastic NK-cell lymphoma, is an uncommon, aggressive non-Hodgkin's lymphoma with cutaneous, lymph node, and bone marrow involvement at presentation. The disease is characterized by early leukemic phase; however, central nervous system involvement is rarely reported. Herein we describe two cases of CD4+/CD56+ hematodermic neoplasm with meningeal manifestation. Microscopic analysis and flow cytometry of cerebrospinal fluid proved to be diagnostic; however, imaging studies were not informative. These observations call attention to the possibility of central nervous system involvement, which could be more common than expected previously. Authors recommend routine cerebrospinal fluid analysis and prophylactic intrathecal chemotherapy in patients with this highly aggressive disease.

Occurrence of Leiopsammodius belloi (Pierotti, 1981) is reported from Hungary for the first time. The species was first found in Csataszög (Jász-Nagykun-Szolnok county), at the sandy bank of Tisza river, then in Sándorfalva (Csongrád-Csanád county). With 3 figures.