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51. In WHO2016 classification, the urothelial proliferation of uncertain malignant potential refers to the lesion formerly called(A) Papillary urothelial neoplasm of low malignant potential (B)Reactive atypia(C)Dysplasia (D)Papillary and flat urothelial hyperplasia

52. The most compatible immunoprofile of so-called invasive urothelial carcinoma of “luminal type” is(A) CK5/6+ GATA3+ (B)CK5/6- GATA3+(C)CK5/6+ GATA3-(D)CK5/6- GATA3-

53 The triple immunostain cocktail recommended for diagnosing limited prostatic adenocarcinoma (2016 WHO, p.147) comprises (A) AMACR/NKX3.1/high-molecular weight cytokeratin (B)AMACR/p63/ high-molecular weight cytokeratin (C)AE1/AE3/AMACR(D)ERG/PSMA/NKX3.1

54. According to 2016 WHO classification, a dermoid cyst in the testis found in a 20- year-old man is classified as (A)Teratoma, prepubertal-type (B)Teratoma, postpubertal-type (C)Germ cell tumor, type III (D)Non-germ cell tumor

55. Which of the following statements about IgA nephropathy (IgAN) is INCORRECT?(A) Dominant or codominant IgA mesangial staining is essential for diagnosis. (B)Antigenic galactose-deficient IgA1 plays a central role in the pathogenesis of IgAN. IgG or IgA autoantibodies form immune complexes with aberrantly galactosylated IgA1 leading to glomerular deposition.(C)The parameters in Oxford classification of IgAN include mesangial hypercellularity (M), endocapillary hypercellularity( E ), segmental sclerosis (S), interstitial fibrosis/tubular atrophy (T) and crescents ( C ). (D)Henoch-Schönlein purpura also has glomerular mesangial IgA deposition, and can be distinguished from IgAN by renal biopsy.