An Unusual Presentation Of A Common Disease
Published Web Locationhttps://doi.org/10.5070/D341w716td
An Unusual Presentation Of A Common Disease1. Department of Dermatology, Barnet & Chase Farm NHS Trust, London, UK
Ioulios Palamaras1, Peter Kench2, Penelope Thomson1, Abdal Hameed Al-Dulaimi1, Howard P Stevens1, Wanda Robles1
Dermatology Online Journal 14 (3): 4
2. Department of Histopathology, Barnet & Chase Farm NHS Trust, London, UK
We present a case of perforating granuloma annulare (PGA), in which we show the natural history of lesions and outline the different clinical types. Our patient responded well to intralesional triamcinolone acetonide 10mg/ml injections. Although she was otherwise well, PGA can be associated with diabetes mellitus in up to 17 percent of cases. Differential clinico-histopathological diagnosis, specifically in relation to necrobiosis lipoidica diabeticorum is being discussed. Treatment for PGA is difficult; apart from topical and/or intralesional steroids (clearance up to 54% in one case series), other options include Psoralen plus UVA (PUVA), systemic isotretinoin, chloroquine or hydroxylchloroquine, sulphapyridine, dapsone, topical application of imidazole creams, and liquid nitrogen. Spontaneous remission has also been reported in up to 77 percent in one case series.
Report of a case
We present the case of a 65-year-old female patient referred to the dermatology department by her general practitioner with a 5-month history of two asymptomatic gradually enlarging papular skin lesions on her left shin.
|Figure 1. Presence of two infiltrated yellowish papules on left shin|
Physical examination revealed two ill-defined yellowish, infiltrated papules with no perilesional erythema located on her left shin (Fig. 1). Over the next 8 weeks the lesions slowly enlarged, coalesced to form a plaque and ulcerated (Figs. 2 & 3), but remained asymptomatic. The patient was otherwise entirely well and on no topical or systemic medication. Full blood cell count, blood biochemistry, and urinalysis showed no abnormalities.
|Figure 2||Figure 3|
|Figure 2. The papules slowly become nodules, start to ulcerate and coalesce.|
Figure 3. Formation of an ulcerated plaque with necrotic discharge
A diagnostic punch biopsy specimen was obtained from the left shin (Figs. 4, 5 & 6). Microscopic examination of hematoxylin-eosin-stained sections of the skin biopsy specimen showed a defect in the epidermis through which necrotic material and associated inflammatory cells appeared to be eliminated. The epidermis at one margin of the defect showed regenerative changes. Necrosis of the dermis was largely masked by recent traumatic hemorrhage (Fig. 4). Another section of the biopsy showed the margin of a focus of necrobiosis with numerous attendant histiocytes, some vaguely palisaded (Fig. 5). Smaller foci of necrobiosis could be discerned amongst the histiocytes (Fig. 6). In association with the clinical features, these findings were in keeping with perforating granuloma annulare (PGA).
|Figure 6. (X200) The section shows the margin of a focus of necrobiosis with numerous attendent histiocytes, some vaguely pallisaded. Smaller foci of necrobiosis can be discerned amongst the histiocytes.|
Whilst waiting for the histology results of the diagnostic biopsy, the lesions remained stable (Fig. 3). Initial treatments with topical potent and ultra potent steroid creams (mometasone furoate 0.1%, clobetasol propionate 0.05%) as well as intralesional steroids (triamcinolone acetonide) were helpful. However, the patient subsequently developed three new lesions: on the anterior aspect of the neck, on the right upper arm and the left knee. These were treated successfully with two monthly sessions of intralesional triamcinolone acetonide 10mg/ml. We found that the latter was the most helpful treatment modality for all her lesions - the final result being an atrophic scar. The number of sessions of intralesional injections for resolution of each PGA lesion was 2 to 4 irrespective of its size or duration. The patient was followed-up for a further 8 months. Having achieved clearance of her treated lesions and in the absence of any new lesions, she was then discharged back to her primary care doctor with instructions to return for further assessment if there was any sign of recurrence.
Perforating granuloma annulare is a rare subtype of granuloma annulare (GA) named by Owens and Freeman in 1971 .
Perforating granuloma annulare tends to appear more frequently in young adults and is more common in women in the first three decades . One review study indicated a prevalence of around 5 percent of GA .
Clinically, the lesions pass through four stages: i) erythematous or skin colored papules (similar to Fig. 1), ii) pustular-like lesions that exude thick, creamy, or clear viscous material (Fig. 2), iii) umbilicated or crusted papular-nodular lesions (Fig. 3), and iv) atrophic scars . There are two presentations of PGA: a localized form with lesions mainly in the upper limbs and palms and a more frequently seen, generalized form in the abdominal area, trunk, upper and lower limbs. The generalized form has a chronic course with 37 percent of cases lasting more than 10 years .
Perforating granuloma annulare lesions may be solitary in only 9 percent of cases and can be associated with diabetes mellitus in 17 percent of cases . Differential diagnosis includes reactive perforating collagenosis , papulonecrotic tuberculid , ulcerated rheumatoid nodule , perforating sarcoidosis , ulcerated or perforating necrobiosis lipoidica diabeticorum (NLD) , and, particularly in children, giant molluscum contagiosum .
Perforating granuloma annulare is different from GA both histologically and clinically . It seems that the superficial localization of the necrobiotic granuloma in PGA leads to the epidermal perforation and transepidermal and follicular elimination of the necrobiotic material .
Treatment of PGA is often unsuccessful. Twelve out of 22 cases (54%) had lesions that resolved following topical, intralesional, or oral steroids. Complete clearing was also achieved in two patients treated with Psoralen plus UVA (PUVA), and in one with oral isotretinoin. Topical application of trichloroacetic acid, imidazole creams, liquid nitrogen, salicylic acid, and oral administration of vitamin A and B6, chloroquine or hydroxylchloroquine, sulphapyridine, dapsone, chlorambucil have been unsuccessful . Spontaneous remission was also reported in 10 of 13 patients (77%) not receiving any treatment .
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