The Elagiri complex (12°31' N: 78°35' E) represents one of the important silica -oversaturated syenite plutons of the Southern Granulite Terrane of the Indian shield. This article for the first time reports the mineral chemistry of the Elagiri complex and brings out important petrogenetic significance. The litho-members of Elagiri complex are intrusive into high grade country rocks viz. granite gneiss, amphibolite and pyroxene granulite. The country rocks are foliated bearing evidences of multiple folding and deformation. On the other hand, the constituent litho members of the Elagiri complex (syenites, gabbro and later intrusives marked by lamprophyre and carbonatite) show preservation of igneous layering in terms of discernible parallelism of the constituent minerals. The Elagiri complex shows presence of sharp contacts among litho members and marked absence of chilled facies peripheral to the margin. Electron microprobe data have been critically used to systematize the constituent mineral-phases of the different lithomembers of the complex. Geothermobarometric data indicate a temperature of equilibration in the range of ~700° to 500°C at ~2.0 to 5.2 kb which corresponds to shallow level (cf. 18.2 km) equilibration-depth of the complex. Field observations and mineral chemistry data suggest that liquid immiscibility plays an important role during the evolution of the Elagiri complex.
Germinomas represent the most frequent tumor type in the pineal region and the synchronous involvement in the suprasellar region, known as bifocal disease, is increasingly recognized. Synchronous primary intracranial germ cell tumors are rare. Among all germ cell tumors, only 5–10% are found as synchronous lesions in pineal and suprasellar regions. They are also known by the entity “double mid-line atypical teratoma.” An adolescent male with phenotypic features of delayed puberty presents with features of hypopituitarism and raised intracranial tension. He was subsequently treated with hormonal replacement and diagnosed as a case of bifocal intracranial germinoma. Interestingly, he was lacking features of diabetes insipidus, which is a conspicuous feature in other reported cases. He was treated further with ventricular shunting followed by cranio spinal irradiation. The complex nature of endocrinological manifestations in bifocal intracranial germinoma will enriches our knowledge toward a potentially curable neuroendocrinological situation.
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