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Linear Lumbar Localized Lysis of Elastic Fibers A Distinctive Clinical Presentation of Mid-dermal Elastolysis

Philip R. Cohen, MD The University of Houston Health Center, University of Houston, Houston, Texas; The Division of Dermatology, University of California San Diego, San Diego, California; The Department of Dermatology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas; The Department of Dermatology, University of Texas-Houston Medical School, Houston, Texas

Jaime A. Tschen, MD The Department of Dermatology, University of Texas-Houston Medical School, Houston, Texas; St. Joseph Dermpath, Houston, Texas;The Department of Dermatology, Baylor College of Medicine, Houston, Texas

Disclosure: The authors report no relevant conflicts of interest.Abstract
Background: The absence or loss of elastic fibers in the skin is referred to as dermal elastolysis. Purpose: This paper describes a woman with a distinctive clinical presentation of mid-dermal elastolysis characterized morphologically by multiple horizontal raised bands on the lower back. Methods: A 20-year-old Filipino woman presented with multiple asymptomatic, flesh-colored, raised, firm, linear, cord-like bands on the lumbar area of her back. There were neither similar lesions elsewhere nor a family member with this condition. Results: Microscopic examination of the raised band showed nearly complete absence of elastic fibers in the mid dermis. In contrast, a biopsy of symmetrically located normal-appearing skin showed a uniform distribution of elastic fibers throughout the dermis. Linear lumbar localized elastolysis is a descriptive designation that accurately reflects a correlation of the clinical and pathological changes of this condition. Conclusion: The clinical differential of raised horizontal cord-like bands on the lower back (without a family history of an inherited elastic fiber disorder, a prior history of trauma, or a significant change in weight or exercise habit) includes linear focal elastosis and linear lumbar localized elastolysis. Microscopic evaluation of a Verhoeff-van Gieson stained lesion specimen (which may be accompanied by a biopsy of normal-appearing skin for comparison) will readily differentiate these conditions. The former is usually characterized by increased elastic fibers, whereas the latter, as in this patient, shows a paucity or absence of elastic fibers in the mid dermis.  (J Clin Aesthet Dermatol. 2013;6(7):32–39.)

Elastolysis refers to the loss of elastic fibers in the dermis. The clinical presentation of skin lesions in patients with elastolysis correlates with the location in the dermis where there is a paucity or absence of elastic fibers. The authors describe a young woman with a unique clinical presentation of mid-dermal elastolysis characterized by multiple asymptomatic, firm, raised, flesh-colored horizontal bands on her lower back: linear lumbar localized elastolysis.

Case Report
A 20-year-old healthy Filipino woman presented with multiple asymptomatic raised linear lesions on her lower back since the age of eight years. There was no history of inherited disorders affecting elastic fibers, such as cutis laxa, Marfan syndrome, or pseudoxanthoma elasticum. Also, there was no history of pregnancy, previous trauma to the area, significant and rapid change in weight, or alteration of exercise habits. The lesions were not present at any other site and no family member had similar skin lesions.

Clinical examination showed 16 firm, smooth, 5mm wide, flesh-colored, raised, horizontal, cord-like bands extending partially or completely across the lumbar back (Figure 1). The remaining physical examination revealed no other similar-appearing lesions.

A punch biopsy was not only performed on the central aspect of a raised band, but also from a symmetric area of skin for comparison. Microscopic examination of the Verhoeff-van Gieson stained specimen from the lesion showed an epidermis without alteration and a normal density and morphology of elastic fibers in the papillary dermis and deep reticular dermis. However, there was nearly complete absence of elastic fibers in the mid dermis with a few fragmented elastic fibers remaining (Figure 2). In contrast, the specimen from her normal skin showed a uniform distribution of normal-appearing elastic fibers throughout the dermis (Figure 3).

The pathological findings established a diagnosis of mid-dermal elastolysis. Correlation of the clinical presentation (multiple, raised, horizontal, linear lumbar bands) and the microscopic features (a localized lysis of elastic fibers) prompted the authors to designate their patient’s condition as linear lumbar localized elastolysis.

Discussion
Mid-dermal elastolysis is an acquired cutaneous disorder of elastic tissue that occurs predominantly in young women. Skin manifestations are asymptomatic and typically appear on the anterior and lateral trunk (of the chest and abdomen) and proximal upper extremities. Less commonly, skin lesions appear on the upper back and neck; involvement of the face and distal extremities is rare.[1–5]

Skin lesions attributed to mid-dermal elastolysis have been classified into three clinical types.[1–5] Patients with type I lesions present with well-demarcated, often symmetric, areas of fine wrinkling.[1] Individuals with type II lesions show perifollicular papillary protrusions; these often have a peau d’orange appearance.[6,7] Indeed, many of the patients have not only type I lesions, but also coexisting type II lesions.[1,7] Type III lesions of mid-dermal elastolysis include predominantly men who present with a persistent reticular erythema that is usually located on the chest; elastic stains demonstrate elastolysis, with or without elastophagocytosis, in the mid dermis.[8–12] The patient’s lesions of mid-dermal elastolysis presented as linear, raised, horizontal bands on her lumbar back—a clinically unique morphology not previously associated with mid-dermal elastolysis.

Microscopic examination of mid-dermal elastolysis skin lesions shows a pathognomonic change: Selective loss of elastic fibers in the mid dermis. A slight lymphocytic infiltrate may be present; occasionally, elastophagocytosis of elastic fibers by macrophages and multinucleated giant cells is also observed. Why the loss of elastic fibers is restricted to the mid dermis remains to be determined. However, experimental studies suggest that pathological degradative processes (including increased elastolytic activity) are associated with elastin turnover dysbalance and subsequent loss of mid-dermis elastic fibers.[1,3,5]

The principle conditions in either the clinical and/or pathological differential diagnosis of mid-dermal elastolysis include anetoderma,[13–16] annular elastolytic giant cell granuloma,[17–21] cutis laxa,[22–25] and pseudoxanthoma elasticum-like papillary dermal elastolysis[26,27] (Table 1).[1–38] In contrast to mid-dermal elastolysis, anetoderma and cutis laxa show loss of elastic fibers in both the papillary dermis and reticular dermis. Pseudoxanthoma elasticum-like papillary dermal elastolysis may clinically resemble the perifollicular protrusions of type II mid-dermal elastolysis; however, careful inspection will discern that the papules are nonfollicular and the microscopic examination demonstrates a band-like absence of elastic fibers restricted only to the papillary dermis.[26,27] Annular elastolytic giant cell granuloma predominantly occurs in sun-exposed areas of middle aged women as an annular lesion with erythematous raised borders and an atrophic wrinkled central area[17–19]; at least two women have been described in whom annular elastolytic giant cell granuloma has both the clinical and pathological features of mid-dermal elastolysis, and the authors have suggested that annular elastolytic giant cell granuloma may represent a prodromal stage of mid-dermal elastolysis.[1,20,21]

Mid-dermal elastolysis presenting as linear lumbar bands of localized lysis of elastic fibers is unique. The patient initially noted her lesions at eight years of age and had erroneously assumed that they were “stretch marks”; however, she had no predisposing factors associated with striae distensae. Also, in contrast to the hypopigmented-to-white, depressed, atrophic, scar-like appearance of older lesions of striae distensae, the patient’s lesions were flesh-colored, raised, firm, horizontal cord-like bands.[39–42]

Microscopic evaluation of a biopsy specimen from a raised cord-like horizontal band on the patient’s lumbar back readily established the diagnosis of mid-dermal elastolysis and excluded the possibility of an older lesion of striae distensae. The authors evaluated not only the lesional biopsy, but also a specimen of normal-appearing skin taken from a symmetric location on her back. Staining with the Verheoff-van Gieson stain highlighted the absence of elastic fibers in the mid dermis of the lesion and the uniform distribution of these fibers throughout the dermis of her nonlesional skin.

In contrast to mid-dermal elastolysis, the pathological changes of elastic fibers observed in striae distensae depend on the age of the lesion and the stain used for evaluation. When either the acid-orcein Giemsa stain or the Luna stain are used, numerous compact, straight, thin, elastic fibers (staining dark brown to black or purple, respectively) that are parallel to the overlying epidermis, which is flat and has lost its rete ridges, can be observed in the papillary dermis in the center of the lesion and curly and clumped elastic fibers can be noted at the periphery. However, after staining with Verheoff-van Gieson stain, early lesions of striae distensae show a reduction in elastic fibers (staining black) and older lesions show thicker elastic fibers in the affected skin. Scanning electron microscopy evaluation of these lesions supports the abundance of elastic fibers in striae distensae; they demonstrate a well-developed, dense network of fine elastic fibers. Therefore, it has been postulated that the elastic fibers present in early lesions of striae distensae are underestimated after staining with Verheoff-van Gieson stain since the elastic fibers are not able to be detected because they are immature and contain insufficient protein matrix to be demonstrated by this routine stain for elastin.[42–44]
The initial clinical impression of the patient’s asymptomatic, acquired, raised, firm, horizontal bands on her lower back was linear focal elastosis (Table 2).[45–57] Linear focal elastosis is an uncommon condition characterized by asymptomatic linear yellow palpable indurated horizontal bands that extend across the mid and lower back of predominantly older men. Microscopic examination of the skin lesions demonstrates an increased amount of thin, wavy, elongated, fragmented, lumpy, and clumped elastic fibers separating the collagen bundles in the reticular dermis. The initial reports of linear focal elastosis described this condition predominantly in elderly Asian and Caucasian men; however, more recent studies report the dermal disorder in both younger individuals and women.[48–50]

After careful review of the published reports of linear focal elastosis, the authors have identified three adolescent boys (2 Korean and 1 Turkish) who had similar clinical and pathology findings as the patient described in this case (Table 3).[45–47] Although the acquired skin lesions on their lumbar back were considered to represent linear focal elastosis (predominantly based upon their morphology and location), each group of investigators commented on the paucity or absence of elastic fibers in the linear raised horizontal bands. Hence, the authors respectfully suggest that the linear, raised, firm, horizontal lumbar back lesions in these individuals are more appropriately considered to represent linear lumbar localized elastolysis—an acquired disorder of elastic tissue that appears to have a predilection for Asian individuals (2 adolescent boys and 1 young woman) and an early onset age—either in adolescence (3 boys) or late childhood (1 girl).

It is remarkable that the location and morphology of the skin lesions in linear focal elastosis are essentially identical to those observed in the patients who had linear lumbar localized elastolysis. Yet, in contrast to the paucity or absence of elastic fibers in the mid dermis associated with linear lumbar localized elastolysis, microscopic examination of a horizontal band in a person with linear focal elastosis of the lower back shows an increase in the reticular dermal elastic fibers. Therefore, to differentiate between linear focal elastosis and linear lumbar localized elastolysis, biopsies can be performed of lesional and normal skin from a symmetric site in an individual who presents for evaluation of raised linear horizontal bands on the mid and lumbar back and the specimens can be evaluated not only using hematoxylin and eosin stained sections, but also with Verhoeff-van Gieson stained preparations.

Conclusion
Linear lumbar localized elastolysis is characterized by pathognomonic pathological changes in the lesional tissue: Nearly complete absence of elastic fibers in the mid dermis with a paucity of residual fragmented elastic fibers. This condition is a unique clinical presentation of mid-dermal elastolysis morphologically presenting as multiple asymptomatic, raised, indurated, horizontal bands on the lumbar back. The clinical and pathological features of linear lumbar localized elastolysis are described in a young Filipino woman and the predominant conditions in the differential diagnosis of mid-dermal elastolysis (such as anetoderma, annular elastolytic giant cell granuloma, cutis laxa, and pseudoxanthoma elasticum-like papillary dermal elastolysis) are reviewed. The similar morphology and location of the patient’s linear lumbar localized elastolysis skin lesions and those of linear focal elastosis (of the lower back) prevented us from being able to differentiate the correct diagnosis based on the clinical presentation of her cutaneous findings. However, a lesional biopsy (especially after comparison to a specimen from a symmetric site of normal-appearing skin), evaluated after staining with Verhoeff-van Gieson stain, readily enabled the authors to definitively establish the diagnosis; linear lumbar localized elastolysis (as in the patient described in this case) showed a paucity of near absence of elastic fibers in the mid dermis, whereas linear focal elastosis demonstrates an increase in elastic fibers between the collagen tissue in the reticular dermis. Therefore, in patients who present with linear, elevated, firm, horizontal bands that partially or completely extend across the lower back, microscopic examination of the skin lesion (and perhaps also tissue of normal-appearing skin from a symmetric site for comparison) using hematoxylin and eosin stains and Verhoeff-van Gieson stain can be performed in order to differentiate between linear focal elastosis and linear lumbar localized elastolysis.

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