<prompt> Which of the following helps in differentiation of follicular carcinoma from follicular adenoma of thyroidHuhle cellLining of tall columnar and cuboidal cellVascular invasionIncreased mitoses  <response>: Ref Robbins 9e p1094 Microscopically most follicular carcinomas are composed of uniform cells forming small follicles.follicular carcinomas may be grossly infiltrative or minimally invasive. The latter are sharply demarcated lesions on gross examination . This distinction requires extensive histologic sampling to exclude capsular or vascular invasion 