Isolated intracranial Rosai-Dorfman disease mimicking meningioma in a child: a case report and review of the literature.

We report the first case of extensive involvement of isolated intracranial Rosai-Dorfman's disease (RDD) in a child. Our case is unique because it presents with involvement of the middle cranial fossa, cavernous sinus, pituitary gland, orbit, ethmoid and sphenoid sinuses. Previous cases of intracranial RDD in children have reported separate involvement of cavernous sinus, suprasellar region, and frontal and petroclival regions. Involvement of the pituitary gland has so far not been reported. A 14-year-old male presented with a medical history of loss of vision, raised erythrocyte sedimentation rate (ESR), and abnormal prolactin and cortisol levels. Radiologically the diagnosis was meningioma. The histopathological diagnosis was RDD with emperipolesis and S-100 positivity. RDD is a histiocytic proliferation of unknown aetiology, which commonly affects lymph nodes. Uncommonly it involves the extranodal sites and rarely the central nervous system (CNS). 80 cases of RDD involving CNS have been reported in the literature, and only 5 were in children. Although the definitive diagnosis of RDD disease is based on the histopathology report, it should be included in the differentials of a lesion mimicking meningioma especially in children.

Frequencies of feline blood types in Hungary.

Feline blood group determination is done as a routine diagnostic method in numerous countries. Blood transfusion reactions and feline neonatal isoerythrolysis (FNI) can be avoided with the identification of different feline blood groups. The present study is the first investigation in Hungary during which 100 cats have been examined from all over the country. These cats were out of six breeds: European domestic shorthair, Persian mix, Persian, Abyssinian, Siamese and British shorthair. In the Hungarian feline population European domestic shorthair are most common but other breeds also occur. European domestic shorthair, Persian mix, Abyssianian, Siamese and British shorthair individuals all belonged to blood type A (100%). Blood type B was found very rarely and only in Persian cats. One-third of the Persian cats were categorised into blood type B, whilst type AB was not found during the study.