Thyroid) heterogeneous tissue, echotexture, 4 vascular nodules both ths and t4 are low. radiologist suggested biopsy, should i be concerned?

Thyroid biopsy ?: In the case discribed, "vascular nodules and "heterogenous tissue" require a biopsy to be certain of cell types. With TSH low, the thyroid is not functioning at normal levels, with the cause possibly related to pituitary dysfunction: with low production of TSH and low T4, the TSH should be high or high normal to produce additional T4. See an endocrinologist for clarification.