Most common route of infection in kidney tuberculosis: (A) Ascending infection, (B) Lymphatic spread, (C) Direct invasion, (D) Hematogenous spread
Answer is D. Genitourinary tuberculosis (GUTB) accounts for 14% of non-pulmonary cases of TB. It is caused by dissemination of the organism through the bloodstream and is thus always secondary TB. ref : Bailey and Love 27th ed , chapter 76 , pg no 1405