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Enrique Benjamín del Castillo

Enrique Benjamín del Castillo Mallea, Argentine clinical endocrinologist (Mendoza 14 December 1897 – Buenos Aires 30 June 1969)
Authored over 200 papers and 7 books

Described Ahumada-del Castillo syndrome

Sobre un caso de galactorrea y amenorrea. Bol. Soc. Obst. Ginecol. Buenos Aires 11:64-72, 1932

With A. Lanari. Sindrome caracterizado por crecimiento exagerado, amenorrea y galactorrea. Semana Medica 1:1905, 1933

Described Del Castillo-Trabucco-Balze syndrome

With Armando E. Trabucco & F.A. de la Balze. Syndrome produced by absence of germinal epithelium without impairment of Sertoli or Leydig cells. J. Clin. Endocrinol. 7:493-502, 1947 
Observed that sex cycle could be seen in urinary sediment what gave rise to urocytogram

Found the changes observed in smears of the urinary sediment closely parallel those seen in vaginal smears   

With J. Argonz & C. Galli-Mainini. Cytological cycle of the urinary sediment and its parallelism with the vaginal cycle. J. Clin. Endocrin. 8:76, 1948

With j. Argonz & C. Galli-Mainini. Smear from the female urethra and their relationship to smears of the urinary sediment. J. Clin. Endocrin. 8:1362, 1949 

Demonstrated that daily injections of estrogens during a period of several months to female castrated rats produced the periodic appearance of vaginal estrus separated by diestrus lasting several days

With C. Calatroni. Cycle sexuel periodique et folliculine. Compt. Rend. Soc. Biol. 104:1024, 1930

With G. di Paola confirmed the induced vaginal cycle by estrogens in the woman (1941) 

Described hypertrophies of sub-maxillary glands in distinct endocrine states