Aim:To evaluate the efficacy of calretinin immunostaining in diagnosing Hirschsprung's disease (HD).Materials and Methods:Sixty cases were studied over a period of 1 year (July 2010-June 2011). There were 36 full-thickness biopsies and 24 resected specimens. Calretinin processing was done on the paraffin-embedded blocks after routine histopathological examination.Results:Of the 36 biopsy specimens, in 19 cases HD was diagnosed by hematoxylin and eosin (H and E) staining earlier. In 2 patients, ganglion cells were seen and HD was ruled out. In 15 cases, there was a diagnostic dilemma and calretinin was used. Ganglion cells were found in 3 specimens and nerve fibers in 5. In all 24 resected specimens, calretinin correlated with the findings on H and E staining.Conclusions:Calretinin was extremely useful in solving the suspicious and indeterminate cases of HD. It can serve as a valuable cost-effective diagnostic aid in the centers where acetylcholinesterase enzyme histochemistry is not available.

Introduction: Meningiomas account for 13%-25% of primary intracranial tumours and ~25% of intraspinal tumors and histological grading has prognostic and therapeutic implications. However, histological criteria are sometimes not fulfilled to predict the biological behaviour of meningiomas, necessitating use of adjunct ancillary techniques like immunohistochemical markers. The aim of the study was to assess the correlation between the p63 protein expression with MIB-1 labelling index in different histological grades. Materials and Methods: This was a retrospective and prospective study of patients with intracranial and intraspinal meningiomas diagnosed during the period 2009-2014. The H& E Stained histological sections of the entire meningioma tumour were graded according to WHO 2007 criteria. Immunohistochemistry was performed using p63 protein and Ki-67. Result: The age of the patients ranged from 4-75 years including seven children. Out of 135 cases, 46 (34.07) cases occurred in males and the remaining 89(65.92%) cases were females. There were 125 grade I, 06 grade II, 04 grade III meningiomas. Amongst Grade I tumours (n =125) 16% (n=20) exhibited nuclear positivity for p63 protein.Among Grade II (n= 06) and Grade III (n= 04), all showed strong immune expression for p63. Statistical significant increase in mean labelling index (MIB1) was noted between Grade I to II and Grade II to III. Conclusion: Increased p63 expression and Ki-67 labelling index is associated more with high grade Meningioma and possible recurrence.