[Brain stone. A case report].

A 43-year-old woman with an abnormally calcified shadow in right temporal lobe as seen on the plain skull films is reported. She was free of any neurological deficit except a recent episode of generalized tonic clonic convulsive seizures. Clinical observations, including EEG have proved unhelpful. Despite intensive neuro-radiological examinations, it only revealed the existence of a dumb-bell shaped calculus measuring 17 x 10 mm in right temporal lobe. Operation and histo-pathological examination were carried out. The mass was a hard calculus, surrounded by minimal perifocal gliosis, and was easy to separate from the normal brain tissue. The decalcified specimen was identified as a collection of PAS positive spherical lamellar particles without any diagnostic cell or structure. After the operation, the calcified shadow was disappeared and the patient is free from seizure. Based on these findings, the calculus can be classified as a very rare category, "idiopathic brain stone".