Microangioinvasive Follicular Carcinoma of the Thyroid
Microangioinvasive follicular carcinomas are well-differentiated encapsulated tumours whose major histological difference from adenomas is the presence of tumour tissue within the lumen of capsular venous sinusoids. The presence of bizarre giant nuclei within the tumour, and also of occasional mitoses and atypical differentiation, does not constitute malignancy in the absence of vascular invasion; such tumours are benign and are described as ΓÇÿatypical adenomasΓÇÖ.
