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pranaya panigrahi dr.pranaya pranay surgery rectal biopsy duhamel teratoma swenson soave pediatric hd nuclear medicine radiotracer technetium gamma camera dmsa dtpa renal scan non seminoma germ cell tumor nonseminoma chorio duodenal stenosis ppt tef ea esophagus congenital anomaly fistula arm anorectal malformation invertogram xray high arm low arm atresia double bubble sign down syndrome duodenal obstruction annular pancreas windsock anastomosis resection aganglionisis ganglion cell enteric nervous system ens calretinin urinary tract infection surgical urology paediatric ureterocele posterior urethral valve reflux vur deflux cystoscopy dj stent splenectomy hypersplenism spleen red pulp white pulp splenic artery megacolon duodenal web web obstruction double bubble bilious vomiting yolksac tumour coccygectomy alpha feto protein malignancy in children saccrococcygeal median sacral artery bleomycin cisplatin embryonal carcinoma hirschsprung disease harold rebhein haec enterocoloitis bhu