Our Services

Thyroid nodules and thyroid cancer

Dr. Hollander is the director of Thyroid and Parathyroid Institute of Princeton. He has earned the prestigious ECNU certification. ECNU is a professional certification in the field of neck ultrasonography for endocrinologists who perform consultations and diagnostic evaluations for thyroid and parathyroid disorders through both diagnostic ultrasound and ultrasound-guided fine needle aspiration.

Dr. Hollander was the first endocrinologist in the region to perform ultrasound guided fine needle aspirations of suspicious thyroid nodules. He was the first endocrinologist in the region to routinely identify parathyroid tumors with high resolution ultrasound. He was the first endocrinologist to routinely biopsy malignant lymph nodes… and he was the first endocrinologist in New Jersey to utilize the AFIRMA® gene expression classifier to reduce the number of unneeded thyroid surgeries.

Endocrinology Associates of Princeton is committed to remaining at the cutting edge of clinical thyroidology.

Disorders of Thyroid Function

Diseases of the thyroid include hypothyroidism, hyperthyroidism, autoimmune thyroid disease, postpartum thyroiditis, and toxic adenomas (hot nodules). The physicians of Endocrinology Associates of Princeton (EAP) can rapidly identify and correct any disorder of thyroid function by utilizing advanced endocrine testing, nuclear thyroid imaging, and onsite high resolution ultrasound.


Osteoporosis is an underdiagnosed and potentially devastating disease. Osteoporosis can lead to significant debility and even death in the geriatric population.

For years, oral bisphosphonates like Fosamax were the mainstay of treatment. Newer agents are available. If you have experienced a fragility fracture (hip fracture or vertebral crush fracture) or if your bone density is deteriorating, it is time you had a thorough metabolic evaluation by a bone specialist.

Endocrinology Associates of Princeton is the leader in osteoporosis care in the region.

Low Testosterone

Low testosterone can cause fatigue, depression, poor libido, poor erectile function, diminished concentration, and weight gain.

Because men frequently will not express their concerns to physicians or loved ones, this disorder remains underdiagnosed and therefore undertreated.

The physicians of EAP treat hundreds of men annually for low T.

Disorders of Calcium Metabolism

Under normal circumstances, calcium homeostasis is controlled mainly by two hormones: 1) parathyroid hormone and 2) vitamin D.

Yes, you read that correctly. Vitamin D is a hormone. For many years the role of vitamin D in maintaining bone health was well recognized. More recently, it is thought that vitamin D sufficiency may protect against certain diseases.

EAP receives a large number of consults annually for difficult cases involving disordered calcium metabolism. Dr. Hollander is the director the Thyroid and Parathyroid Institute of Princeton and is one of very few endocrinologists in New Jersey skilled at identifying diseased parathyroid glands with high frequency ultrasound.


There is an epidemic of obesity in this country which is driving an epidemic of type 2 diabetes mellitus. This disease is largely a lifestyle disease, but it a serious disease none-the-less. The good news is that there are many new treatments designed to improve glycemic control and to improve quality of life.

If you are not achieving your glycemic goals, or your hemoglobin A1c remains above 7% despite your best efforts, take the time out to see a specialist. Remember, uncontrolled diabetes can lead to blindness, accelerated atherosclerosis, kidney failure, and loss of limbs.

The physicians of EAP are at the forefront of diabetes care. We provide onsite Hemoglobin A1c testing, continuous glucose monitoring, advanced diabetes management with insulin pumps, and comprehensive diabetes education.

Other Endocrine disorders

The doctors of EAP routinely treat the following diseases:

Pituitary tumors:

  1. Cushing’s Syndrome
  2. Acromegaly
  3. Prolactinoma
  4. Benign macroadenomas

Adrenogenital disorders:

  1. Congenital adrenal hyperplasia
  2. Polycystic Ovarian Syndrome (PCOS)
  3. Hyperaldosteronism
  4. Hirsuit (excess male pattern hair growth)

Disorders of the posterior pituitary:

  1. Diabetes insipidus
  2. Syndrome of inappropriate anti-diuretic hormone (SIADH)