|Year : 2019 | Volume
| Issue : 1 | Page : 36-38
An uncommon presentation of a common disorder: Van Wyk–Grumbach syndrome
Beatrice Anne1, Vidyasagar Simhadri2, Vamsi Krishna Yerramneni3, D Neusha1
1 Department of Endocrinology, Nizam's Institute of Medical Sciences, Hyderabad, Telangana, India
2 Department of General Medicine, Alluri Sitaramaraju Academy of Medical Sciences, Eluru, Andhra Pradesh, India
3 Department of Neurosurgery, Nizam's Institute of Medical Sciences, Hyderabad, Telangana, India
|Date of Web Publication||1-Apr-2019|
Dr. Beatrice Anne
Department of Endocrinology, Nizam's Institute of Medical Sciences, Punjagutta, Hyderabad - 500 082, Telangana
Source of Support: None, Conflict of Interest: None
Van Wyk–Grumbach syndrome (VWGS) is characterized by juvenile hypothyroidism, delayed bone age, and isosexual precocious puberty. We report the case of a 7-year-old girl who presented with premature menarche, short stature, and isosexual precocity. She had delayed bone age and multicystic ovaries. High circulating levels of thyroid-stimulating hormone (TSH) with prepubertal luteinizing hormone confirmed the diagnosis of VWGS. High circulating levels of TSH acting directly on follicle-stimulating hormone receptors could be the mediators of precocity. VWGS syndrome is quite rare and needs to be suspected for prompt treatment and resolution and avoidance of unnecessary surgery.
Keywords: Hypothyroidism, precocious puberty, Van Wyk–Grumbach syndrome
|How to cite this article:|
Anne B, Simhadri V, Yerramneni VK, Neusha D. An uncommon presentation of a common disorder: Van Wyk–Grumbach syndrome. Thyroid Res Pract 2019;16:36-8
|How to cite this URL:|
Anne B, Simhadri V, Yerramneni VK, Neusha D. An uncommon presentation of a common disorder: Van Wyk–Grumbach syndrome. Thyroid Res Pract [serial online] 2019 [cited 2020 Aug 14];16:36-8. Available from: http://www.thetrp.net/text.asp?2019/16/1/36/255296
| Introduction|| |
In 1960, Van Wyk and Grumbach described the association of hypothyroidism and precocious puberty. Van Wyk–Grumbach syndrome (VWGS) presents as precocious menarche, breast development, galactorrhea, delayed bone age, and multicystic ovaries in combination with long-standing primary hypothyroidism.
Hypothyroidism leads to delayed bone age and a reduction in growth rate by reducing the amplitude of growth hormone pulses. We report the case of a girl with long-standing, untreated hypothyroidism who presented with precocious puberty and short stature.
| Case Report|| |
A 7-year-old girl presented with menarche 3 months back. She had been having regular menstrual cycles with average flow. She was born of nonconsanguinous marriage at full-term, normal vaginal delivery, and was first in the birth order. Her birth weight was 2.5 kg, and she had normal developmental milestones.
There was no history of headache, vomiting, visual symptoms, or gelastic seizures. Her appetite was normal, and she did not have excessive sleep, cold intolerance, or constipation. Her scholastic performance continued to be average.
Her height was 95.7 cm (<3rd centile) and weight was 14.6 kg (<3rd centile) [Figure 1]. Her pulse rate was 68/min and blood pressure was 98/60 mmHg. She had pallor and dry scaly skin. There was Grade I goiter. On Tanner's staging, she had prepubertal breasts and no axillary or pubic hair.
|Figure 1: The patient, a 7-year-old girl, with short stature and precocious puberty with her parents|
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She had normocytic normochromic anemia with a hemoglobin level of 10 g/dl (normal 12–14 g/dl). Hormonal investigations revealed thyroid-stimulating hormone (TSH) >100 μIU/ml (0.35–5.5), T3 41.5 pg/ml (60–181), T4 1.5 ng/ml (4.5–12.6), and follicle-stimulating hormone (FSH) 9.04 mIU/ml (0.3–2.0), luteinizing hormone (LH) <0.85 mIU/ml (0.1–6.0), and prolactin 132.2 ng/ml (2.8–29.2). Her radiological investigations revealed a bone age of 4 years (Greulich and Pyle's Atlas More Details). Ultrasonography of the pelvis showed a uterine size of 4.2 cm × 2.7 cm × 1.4 cm with enlarged multicystic ovaries. The magnetic resonance imaging of sella, which the patient had brought with her at presentation, revealed a sellar-suprasellar mass lesion showing bilobed/dumbbell “figure of 8” configuration with waisting at the level of diaphragm sella 1.6 cm × 1.2 cm × 1.9 cm size [Figure 2]. This finding had prompted referral to the neurosurgeon for surgical consideration in the first place, before the case was referred to endocrinology for further evaluation. Antithyroid peroxidase antibodies were not done due to financial constraints. She was diagnosed to have VWGS with feedback pituitary hyperplasia. We started her on thyroxine replacement and she has been advised to follow-up with her thyroid function tests after 2 months.
|Figure 2: The magnetic resonance imaging of sella showing sellar–suprasellar mass lesion with bilobed/dumbbell “figure of 8” configuration|
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| Discussion|| |
Primary hypothyroidism usually presents with manifestations such as weight gain, poor concentration, depression, fatigue, muscular weakness, menstrual irregularities, and short stature. Rarely, it can present as VWGS. VWGS presents as precocious menarche, breast development, galactorrhea, delayed bone age, and multicystic ovaries. The patient described in this case report also had incomplete isosexual precocious puberty manifesting with menarche.
In girls, the condition usually presents with vaginal bleeding and uncommonly with breast development or galactorrhea. Boys have macroorchidism without significant signs of virilization. The salient diagnostic features include long-standing hypothyroidism,, high levels of TSH, isosexual precocity with lack of public and axillary hair growth, and delayed bone age. The most common cause of hypothyroidism in these patients is autoimmune thyroiditis. Sella turcica enlargement may be seen and it has been attributed to thyrotroph hyperplasia.
Van Wyk and Grumbach postulated a lack of specificity in the feedback mechanism leading to an overproduction of multiple hormones. The serum gonadotropin levels in these patients are relatively low for their degree of gonadal stimulation. Thus, elevated gonadotropins alone cannot completely explain the gonadal stimulation seen in severe juvenile hypothyroidism. High circulating levels of TSH acting directly on FSH receptors may be the actual mediator of precocity. Low FSH-like activity of TSH can be clinically significant at very high concentrations of TSH. This leads to overproliferation of Sertoli cells More Details and responsible for macroorchidism in males. In females, the multicystic ovaries may result from elevated levels of circulating gonadotropins or via increased prolactin. However, ovarian enlargement may be secondary to a myxedematous infiltration. Our patient also had multicystic ovaries with normal to low gonadotropins, suggesting that the increased sensitivity of ovaries to gonadotropins may be responsible for it.
A gonadotropin-releasing hormone (GnRH)-independent mechanism may be a possible explanation, because GnRH did not suppress the pubertal LH levels. It has also been shown that the FSH response to thyrotropin-releasing hormone (TRH) is augmented in primary hypothyroidism. Hence, another theory for the possible mechanism of precocity here could be that the incomplete sexual precocity and the increased prolactin secretion and galactorrhea are a consequence of the increased release of TRH, the increased sensitivity of the mammotrophs and gonadotroph to TRH, or both. This mechanism would also explain the relatively rapid and complete reversal of the syndrome by levothyroxine treatment.
In patients with isosexual pseudoprecocity, the presence of palpable adnexal mass would suggest ovarian tumors; however, in all such cases, the bone age is advanced. Hence, the presence of a delayed bone age in patients with precocious puberty is an important clue for the diagnosis of VWGS. All symptoms subside with thyroxine replacement, the endocrine abnormalities resolve, and even the ovarian cysts decrease in size or altogether disappear.
| Conclusion|| |
Hypothyroidism is a common endocrine disorder that rarely presents as VWGS. VWGS is easily reversible by early diagnosis and adequate thyroxine therapy. High clinical suspicion, early diagnosis, and treatment can avoid unnecessary imaging and surgical intervention. This syndrome, when untreated, leads to short stature and psychosocial impairment.
We report this interesting association between hypothyroidism and precocious puberty with feedback pituitary hyperplasia as it would help clinicians in the early diagnosis and avoidance of unnecessary surgery.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2]