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karmaker raghunath hd burn nephroblastoma tumor rk nath teratoma arm allstaged complete arm management mesenteric cyst hydronephrosis sinus anomely hbs neuroblastoma case new born preoperative preparation portal htn trauma head injury oesophageal atresia tef mesenteric omental cyst hypospadias adrenal gland tumor topic topic presentation neural crest cell tumor neuroblastoma wilms tumor pseudohermaphrodite hermaphrodite ambiguous genitalia differences of sex development disorders of sexual developmen dsd raghu nath karmaker pediatric surgery hodgkin lymphoma nhl hl long case lymphoma saccrococcygeal tera