Indian Journal of Endocrinology and Metabolism

CASE REPORT
Year
: 2012  |  Volume : 16  |  Issue : 3  |  Page : 460--462

Dermopathy of Graves' disease: Clinico-pathological correlation


Sagili Vijaya Bhaskar Reddy1, Sushil Kumar Gupta1, Manoj Jain2,  
1 Department of Endocrinology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
2 Department of Pathology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

Correspondence Address:
Sagili Vijaya Bhaskar Reddy
Department of Endocrinology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow - 226014, Uttar Pradesh
India

Abstract

Dermopathy of Graves«SQ» disease is a classical, but uncommon extrathyroidal manifestation of Graves«SQ» disease. The images of a typical case of dermopathy of Graves«SQ» disease are presented along with clinico-pathological correlation.



How to cite this article:
Reddy SB, Gupta SK, Jain M. Dermopathy of Graves' disease: Clinico-pathological correlation.Indian J Endocr Metab 2012;16:460-462


How to cite this URL:
Reddy SB, Gupta SK, Jain M. Dermopathy of Graves' disease: Clinico-pathological correlation. Indian J Endocr Metab [serial online] 2012 [cited 2021 May 6 ];16:460-462
Available from: https://www.ijem.in/text.asp?2012/16/3/460/95714


Full Text

 Introduction



Dermopathy of Graves' disease is a classical, but uncommon extrathyroidal manifestation of Graves' disease. The images of a typical case of dermopathy of Graves' disease are presented along with clinico-pathological correlation.

 Case Report



A 45-year-old male patient, chronic heavy smoker was diagnosed to have thyrotoxicosis due to Graves' disease of four years duration and was on therapy with carbimazole. He developed clinically mild inactive Graves' ophthalmopathy of three years duration in the form of grittiness, watering, protrusion of eyes with periorbital edema without diplopia or diminution of vision. He also developed non-pruritic hyperpigmented plaque like lesions over both shins of two years duration.

On examination, he was thyrotoxic and had a diffuse symmetric firm non-tender goiter [Figure 1]a. He had mild clinically inactive ophthalmopathy in the form of mild exophthalmos (exophthalmometry reading 21 mm bilaterally) and periorbital edema [Figure 1]b and clubbing of the digits consistent with acropachy [Figure 1]c. He had raised hyperpigmented, hyperkeratotic and waxy plaque like lesions over both pretibial regions [Figure 2]a and b. {Figure 1}{Figure 2}

On laboratory evaluation, thyroid function tests revealed thyrotoxicosis (suppressed TSH <0.1 mIU/L (normal range 0.3 - 5), elevated total T4 19.7 μg/dL (4.6 - 12.4) and total T3 353 ng/dL (87 - 187) with thyroid scan showing diffuse homogeneous symmetric increased uptake in both lobes of the thyroid uptake consistent with Graves' disease. TSH receptor antibody titer by 2 nd generation ELISA (Medizym T.R.A., Medipan GmbH, Dahlewitz/ Berlin, Germany) was elevated (>40 IU/L; normal range 0 - 1.5 IU/L).

Skin biopsy from the pretibial skin was performed to confirm the diagnosis. Hematoxylin and eosin stain of the skin biopsy specimen showed widely separated collagen fibers in the dermis with a normal appearing epidermis [Figure 3]a. Alcian blue stain showed diffuse blue staining in the dermis consistent with abundant mucin/ glycosaminoglycan deposition separating the collagen bundles [Figure 3]b. {Figure 3}

The patient was advised smoking cessation, lubricant eye drops and eye protection for his eyes. He was continued on carbimazole and propranolol. He was advised definitive therapy for Graves' disease with surgery or radioiodine ablation. The lesions of dermopathy were not treated as they were asymptomatic.

 Discussion



Dermopathy of Graves' disease (pretibial myxedema) is an uncommon autoimmune extrathyroidal manifestation of Graves' disease, seen in 0.5-4.3% of cases as per literature from white Caucasians. [1] Dermopathy is almost always associated with Graves' ophthalmopathy and occurs mainly in patients with high TSH receptor antibody titers. [2] Up to 15% of patients with severe Graves' ophthalmopathy have Graves' dermopathy. [1] It is reported less commonly from India, only in the form of a few case reports, mainly in literature from dermatology journals. [3],[4],[5],[6],[7] Possible explanations (not conclusively proven) for rarity of reports on dermopathy of Graves' disease from India include lesser genetic predisposition, lesser prevalence and severity of ophthalmopathy and lesser prevalence of smoking. The pathogenesis is due to expression of TSH- receptor antigen in the skin fibroblasts, triggering the auto-immune response. [2] Dermopathy of Graves' disease is usually a late manifestation, occurring later than thyrotoxicosis and ophthalmopathy. [1],[2],[8] Dermopathy of Graves' disease is associated with acral acropachy in 20% of cases. [1] Acropachy is the least common of the extra-thyroidal manifestations of Graves' disease and always occurs in patients with co-existent ophthalmopathy and dermopathy. [1],[9] Acral acropachy presents with digital clubbing, swelling of digits and toes, and periosteal reaction of extremity bones. [9]

Dermopathy of Graves' disease is usually asymptomatic and is mainly of cosmetic concern. [2] The typical site for dermopathy is the pretibial regions (in up to 99% of cases) and the predilection for this site is due to mechanical factors and dependent position. [1],[2] Unusual locations for dermopathy include dorsum of feet, shoulders, upper back, upper extremities (dorsum of hands) and pinnae, often preceded by history of trauma. [1] The lesions can be of nonpitting edema, plaque, nodular or elephantiasic form. [1] Histopathology of the skin shows normal epidermis. The dermis shows abundant mucin/ glycosaminoglycan deposition separating and splaying the dermal collagen fibers. [1] There is perivascular lymphocytic infiltration in many cases.

As most of these lesions are asymptomatic, no specific therapy is required. [2] For symptomatic cases, topical corticosteroid therapy under occlusive or compressive dressings is recommended. [2] Upto 50% of lesions go into complete or partial remission over time. [1],[2]

References

1Schwartz KM, Fatourechi V, Ahmed DD, Pond GR. Dermopathy of Graves' disease (Pretibial myxedema): Long-term outcome. J Clin Endocrinol Metab 2002;87:438-46.
2Fatourechi V. Pretibial myxedema: Pathophysiology and treatment options. Am J Clin Dermatol 2005;6:295-309.
3Veeranna S, Kushalappa, Betkerur J, Savitha. Pretibial myxedema, ophthalmopathy and acropachy in a male patient with Graves' disease. Indian J Dermatol Venereol Leprol 2004;70:380-2.
4Kakati S, Doley B, Pal S, Deka UJ. Elephantiasis nostras verrucosa: A rare thyroid dermopathy in Graves' disease. J Assoc Physicians India 2005;53:571-2.
5Kumaran MS, Dogra S, Kanwar AJ. Asymptomatic skin coloured plaques over the lower limbs. Indian J Dermatol Venereol Leprol 2005;71:374-5.
6Chatterjee M. The spectrum of thyroid autoimmunity. Indian J Dermatol 2006;51:131-3.
7Ganie MA, Meher LK, Kriplani A, Ammini AC. Graves' dermopathy without ophthalmopathy in pregnancy an unusual presentation. Indian J Endocrinol Metab 2007;11:51-2.
8Fatourechi V, Pajouhi M, Fransway AF. Dermopathy of Graves' disease (pretibial myxedema). Review of 150 cases. Medicine (Baltimore) 1994;73:1-7.
9Fatourechi V, Ahmed DD, Schwartz KM. Thyroid acropachy: Report of 40 patients treated at a single institution in a 26-year period. J Clin Endocrinol Metab 2002;87:5435-41.