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CME ARTICLE |
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| Year : 2014 | Volume
: 59
| Issue : 1 | Page : 3-14 |
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| Reticulate dermatoses |
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Keshavmurthy A Adya, Arun C Inamadar, Aparna Palit
Department of Dermatology, Venereology and Leprosy, SBMP Medical College, Hospital and Research Center, BLDE University, Bijapur, Karnataka, India
| Date of Web Publication | 23-Dec-2013 |
Correspondence Address:
Arun C Inamadar
Department of Dermatology, Venereology and Leprosy, SBMP Medical College, Hospital and Research Center, BLDE University, Bijapur, Karnataka - 586 103
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0019-5154.123480
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 Abstract | | |
The term "reticulate" is used for clinical description of skin lesions that are configured in a net-like pattern. Many primary and secondary dermatoses present in such patterns involving specific body sites. Certain cutaneous manifestations of systemic diseases or genodermatoses also present in such manner. This review classifies and describes such conditions with reticulate lesions and briefly, their associated features.
Keywords: Mottling, net-like, reticulate, retiform
How to cite this article:
Adya KA, Inamadar AC, Palit A. Reticulate dermatoses. Indian J Dermatol 2014;59:3-14 |
What was known?
Reticulate configuration of lesions is seen in many primary dermatoses and also as cutaneous reaction patterns consequent to internal pathology.
| Reticulate Dermatoses | |  |
The term "reticulate" is commonly used for clinical description of "net-like", "sieve-like," or "chicken wire" configuration of the skin lesions. Various congenital and acquired dermatoses present with this pattern of skin lesions. Many systemic diseases also present with such cutaneous manifestations providing useful clues to diagnosis.
Classification
- Vascular
- Cutis marmorata
- Cutis marmorata telangiectatica congenita (CMTC)
- Livedo reticularis (LR)
- Livedo racemosa
- Livedoid vasculopathy
- Reticulate purpura
- Pigmentary
- Dowling-Degos disease (DDD)
- Galli-Galli disease
- Dermatopathia pigmentosa reticularis
- Dyschromatosis universalis hereditaria (DUH)
- Reticulate acropigmentation
- Reticulate acropigmentation of Dohi
- Reticulate acropigmentation of Kitamura
- Syndromes associated with reticulate pigmentation
- Naegeli-Franceschetti-Jadassohn syndrome
- Mendes da Costa-van der Valk syndrome
- Hoyeraal-Hreidarrson syndrome
- Partington syndrome
- Atopic dirty neck
- Epidermolysis bullosa with mottled pigmentation
- Systemic sclerosis
- Poikilodermatous
- Inherited
- Rothmund-Thomson syndrome More Details
- Dyskeratosis congenita
- Xeroderma pigmentosum
- Cockayne syndrome
- Fanconi anemia
- Mendes da Costa syndrome
- Kindler syndrome
- Degos-Touraine syndrome
- Hereditary sclerosing poikiloderma of Weary
- Hereditary acrokeratotic poikiloderma of Weary
- Werner's syndrome (adult progeria)
- Chanarin-Dorfman syndrome
- Diffuse and macular atrophic dermatosis
- Acquired
- Poikiloderma of Civatte
- Injury by cold, heat, or ionizing radiation
- Chronic graft-versus-host disease (cGVHD)
- Others
- Dermatomyositis
- Lupus erythematosus
- Parapsoriasis
- Mycosis fungoides
- Poikiloderma-like cutaneous amyloidosis
- Infectious
- Confluent and reticulate papillomatosis (CRP)
- Erythema infectiosum
- Erythema marginatum (EM)
- Congenital rubella syndrome
- Metabolic
- Macular amyloidosis
- Amyloidosis cutis dyschromica
- Reticular erythematous mucinosis
- Hunter's syndrome
- Others
- Erythema ab igne
- Prurigo pigmentosa
- Mucosal lichen planus
- Leukoplakia
- Neonatal lupus erythematosus (LE)
- Hereditary angioedema
- Extensive congenital erosions and vesicles healing with reticulate scarring
- Atrophodermia vermiculata
- Nekam's disease
| Vascular Causes of Reticulate Lesions | | |
Cutis marmorata
Cutis marmorata is a physiological response to cold exposure seen in neonates that readily disappears on re-warming. It is characterized by marbling of the skin in the form of a reticulate bluish vascular pattern due to dilatation of capillaries and small venules. [1],[2] It involves the limbs and trunk in a symmetrical manner [Figure 1]. This physiological mottling disappears by 6 months of age. [3] Persistent cutis marmorata, or the one which recurs until early childhood, is associated with cretinism and forms a part of various inherited syndromes [Table 1]. In some infants, due to transient constriction of the deep vasculature, a white negative pattern of cutis marmorata (cutis marmorata alba) may occur. [2]
CMTC (congenital phlebectasia, van Lohuizen syndrome)
CMTC is a distinct condition characterized by reticular vascular mottling, predominantly involving the trunk and limbs, that resembles the physiological cutis marmorata. However, it is distinguished from the latter by the persistent nature (even after re-warming), deep livid-purple color, and association with cutaneous atrophy or ulceration. [4] Distribution may be localized, segmental, or widespread. [5] The mottling gets accentuated by cold temperature, crying, or vigorous activity. More than half of the cases are associated with other anomalies. CMTC forms a part of various syndromes also [6] [Table 2].
LR and livedo racemosa
LR is perhaps the prototype among the reticulate dermatoses. It is characterized by bluish-red discoloration of the skin in a typical net-like pattern due to decreased blood flow through and decreased oxygen tension in the cutaneous venous plexuses. [12] Lower temperature accentuate the mottling. The anatomical organization of the cutaneous vasculature is the basis of this particular pattern of mottling. Lower extremities are predominantly involved. The net-like pattern is usually complete in LR as opposed to livedo racemosa which has a branching pattern (broken livedo). Other differences between LR and livedo racemosa [12],[13],[14] are listed in [Table 3].
LR may be physiological (cutis marmorata), idiopathic (usually benign), or may be associated with other conditions [9],[15],[16],[17] [Table 4]. If the mottling is associated with necrosis or purpura, the terms necrotizing livedo or retiform purpura (see below), respectively, are used. Livedo racemosa and livedo with purpura or necrosis are almost always associated with systemic diseases. [12]
Livedoid vasculopathy (livedoid vasculitis, segmental hyalinizing vasculitis, LR with summer/winter ulceration)
One of the synonyms for this condition is "painful purpuric ulcers with reticular pattern of the lower extremities (PURPLE)," which precisely describes the clinical features of this entity. Livedoid vasculitis, usually a disease of middle aged women, [18] presents in two stages; initial manifestations are painful purpuric lesions involving predominantly the gaiter region of the lower extremities (usually bilateral) that evolve into painful shallow ulcers. Later the ulcers heal with stellate ivory-white scars, which have a reticulate pattern (atrophie blanche).
The pathogenesis of this condition is attributed to hyper-coagulable states resulting in microvascular thrombosis and consequently cutaneous ischemia and necrosis. The term livedoid vasculitis could be misleading as histopathological evaluation shows more of intravascular changes like fibrin thrombi, and sparse peri-vascular lymphocytic infiltrate without true vessel wall infiltration. [19],[20]
Livedoid vasculopathy may be idiopathic or associated with other conditions [Table 5]. One of the common associations is chronic venous hypertension. Unlike the typical evolution, atrophie blanche associated with chronic venous hypertension is not preceded by painful purpura or ulcers. [15]
Reticulate purpura
Reticulate or retiform purpuric lesions are usually associated with disorders causing cutaneous microvascular occlusion. This pattern of purpura forms a useful clinical indicator for this group of disorders and helps in differentiating from other causes of purpura. Other clinical features that suggest this category of diseases [Table 6] as the underlying cause are purpura without erythema, eschar without erythema, and branching extension of the lesional margins. [15] | Table 6: Microvascular occlusive disorders associated with reticulate purpura
Click here to view |
| Reticulate Pigmentary Disorders | | |
DDD (reticular pigmented anomaly of the flexures)
DDD is an autosomal dominant disorder that manifests after puberty and is characterized by asymptomatic symmetrical reticulate hyperpigmentation involving the neck, axillae [Figure 2], groins, and other flexures like the inframammary folds in females. [36],[37] It occurs due to mutation in the keratin 5 gene, [38] which is also the genetic anomaly seen in a variant of epidermolysis bullosa simplex associated with reticulate pigmentation (see below). Lesions may also involve the vulva. Other associated cutaneous findings include comedo-like lesions and pitted perioral scars. [39] It has been reported to be associated with hidradenitis supurrativa. [40],[41],[42] Typical histopathological features include irregular elongated thin rete ridges with heavily pigmented tips. [39]
Galli-Galli disease is a variant of DDD [43] with identical inheritance and clinical features. The differentiating histopathological features are presence of a suprabasal cleft [44] and suprapapillary thinning of the epidermis in addition to digitate down-growth of rete ridges.
Dermatopathia pigmentosa reticularis
Dermatopathia pigmentosa reticularis is an autosomal dominant condition characterized by reticulate hyperpigmentation, nail dystrophy, adermatoglyphia, hypohidrosis, and non-cicatricial alopecia. [45],[46] It shares the same genetic defect (nonsense or frameshift mutations in the KRT 14 gene) [47],[48] with Naegeli-Franceschetti-Jadassohn syndrome (see below). The reticulate hyperpigmentation begins in early childhood, or may be present since birth, and predominantly involves the trunk. Other reported findings include palmoplantar keratoderma, [46] hair shaft defects, [49] oral mucosal pigmentation, and atraumatic non-scarring blisters over the extremities. [50]
Dyschromatosis universalis hereditaria
DUH is an autosomal dominant disorder characterized by an early onset of multiple reticulate hyper- and hypopigmented macules scattered allover the body. [51] The condition is more common among Japanese and Chinese. The dyschromia initially appears on the trunk and later becomes generalized, which may include the palms and soles. The general health of the affected individuals is otherwise normal. However, ocular and auditory anomalies, photosensitivity, developmental delay, and short stature are uncommonly reported, [50] so has been the autosomal recessive mode of inheritance. [52]
Reticulate acropigmentation
Reticulate acropigmentation of Dohi (dyschromatosis symmetrica hereditaria (DSH)) and reticulate acropigmentation of Kitamura are the two classical disorders of this group. Both have autosomal dominant inheritance and were initially described among the Japanese population.
Reticulate acropigmentation of Dohi is characterized by reticulate hyper- and hypopigmented macules on the extensor aspect of the extremities, especially on the dorsum of hands [Figure 3] and feet. [53] Mutations affecting the ADAR1 gene [54] have been ascertained as the cause of DSH. There may be associated freckle-like macules on the face. The lesions appear early in life and become non-progressive by adolescence. [50]
Reticulate acropigmentation of Kitamura is characterized by reticular freckle-like pigmentation involving the dorsum of hands and feet that begins in early childhood or adolescence, and may eventually become generalized. The distinguishing feature of this disease is the presence of fine palmar pits and interruptions in dermatoglyphics. [55]
Atopic dirty neck
In the childhood phase of atopic dermatitis, along with flexural localization of the dermatitis, some patients may develop a conspicuous reticulate hyperpigmentation of the neck that bears quite a resemblance with macular amyloidosis. [56],[57] Interestingly, amyloid has been demonstrated in some of these cases at the ultrastructural level, but not on light microscopy. [58]
Systemic sclerosis
The typical "salt and pepper" pigmentation, which is characterized by hypopigmented to depigmented patches with perifollicular retained pigmentation, giving a reticulate pattern, is the most common cutaneous pigmentary change seen in systemic sclerosis. It predominantly involves the face, back, lower abdomen, and less commonly, the legs. Other pigmentary changes include diffuse Addisonian pigmentation, flexural hyperpigmentation resembling acanthosis nigricans, and diffuse mottled pigmentation.
Many inherited syndromes are associated with reticulate cutaneous pigmentation [Table 7]. The reticulate pigmentary anomaly may be congenital in some while it develops at a later date in others.
Poikilodermatous disorders
The term poikiloderma refers to a triad of cutaneous atrophy, telangiectasia, and reticulated dyspigmentation, which is hyper- or hypopigmentation [Figure 4]. Poikiloderma is a feature of various inherited genodermatoses [Table 8], acquired, or associated with other disorders. Histopathology of poikiloderma shows variable areas of epidermal hyperkeratosis and atrophy, interface reaction (vacuolar degeneration of the basal layer with band-like mononuclear infiltrate), and dermal melanophages with perivascular lymphocytic infiltrate.
Acquired causes of poikiloderma include poikiloderma of Civatte, cGVHD, and poikiloderma due to injury by cold, heat, or ionizing radiation. Poikiloderma of Civatte is seen in middle-aged fair-skinned women and is characterized by poikilodermatous involvement of the front and sides of the neck, the V-area of the upper chest, with conspicuous sparing of the submental and submandibular region. This distribution is suggestive of ultraviolet (UV) exposure as the underlying cause. [73] cGVHD occurs in 60%-70% of stem cell transplant recipients, which is usually seen beyond the 100 th post-transplant day. The most commonly affected organs are the skin, eyes, mouth, and liver. The common skin manifestations include lichenoid papules, poikiloderma, and sclerodermatous changes. Oral involvement is characterized by oral lichen planus (OLP)-like lesions. Xerosis affects both the oral cavity and eyes. Hepatic involvement is characterized by cholestasis with consequent elevated alkaline phosphatase and bilirubin. [74] Other conditions associated with poikiloderma are listed in [Table 9].
| Reticulate Lesions in Infectious Conditions | | |
CRP (of Gougerot and Carteaud)
CRP is a disorder of adolescent males and females characterized by development of dry hyperpigmented papules with minimal scaling that later become confluent in the center, with gradual peripheral extension, where these form a reticulate pattern [Figure 5]. Most commonly, and classically, the inter-mammary region is affected. The neck, upper back, and lateral chest are other commonly involved sites. Dietzia papillomatosis, a novel actinomycete, has been isolated from the lesions. [81] Pityrosporum orbiculare has also been implicated in the pathogenesis, [82] but it has not been isolated from the lesions in many. Response to topical antifungals is disappointing also. Minocycline, azithromycin, and topical mupirocin have been found to be effective, which further supports the role of bacterial pathogens in the disease pathogenesis.
Erythema infectiosum (5 th disease)
A reticulate pattern of erythematous rash develops in the second stage of the disease that begins in 1-4 days of the appearance of the "slapped-cheek" rash. The rash begins as a confluent erythema, which later develops central clearing at places, producing a reticulate pattern. The rash predominantly involves the limbs and trunk, and may be pruritic. It fades over 2-3 weeks, but may episodically recur following UV exposure, hot bath, etc. [83],[84]
Erythema marginatum
EM and subcutaneous nodules are the two dermatological manifestations of rheumatic fever that are included in the revised Jones diagnostic criteria. EM appears as evanescent patchy erythema, predominantly over the trunk that develops central clearing and peripheral extension. Adjacent lesions may coalesce to produce a reticulate pattern. Successive crops may occur over few weeks and they tend to be more prominent in the afternoon. EM has to be differentiated from acute urticaria, erythema multiforme, and other reactive erythemas.
Congenital rubella syndrome
The distinct cutaneous lesions of congenital rubella syndrome are the initial "cranberry muffin" lesions (raised red spongy papules), which develop intralesional hemorrhage, producing the conspicuous "blueberry muffin" lesions [85] that are indicative of persistent dermal erythropoiesis. However, a reticulate erythema involving the face and limbs in association with lymphadenopathy is also seen. [2],[86]
| Reticulate Lesions in Metabolic Disorders | | |
Primary cutaneous amyloidosis
The more common macular amyloidosis and the rare amyloidosis cutis dyschromica are the types of primary cutaneous amyloidosis that have reticulate morphological patterns, apart from the poikiloderma-like cutaneous amyloidosis (PCA) as described in [Table 9].
Macular amyloidosis presents as hyperpigmented macules configured in a typical "rippled" pattern giving a tight net-like appearance. Lesions are mostly asymptomatic. Classical sites involved are the interscapular region and outer arms. Exact etiology has not been ascertained but chronic rubbing has been implicated as one. Amyloidosis cutis dyschromica is a rare form of primary cutaneous amyloidosis that is characterized by reticulate hyper- and hypopigmented macules scattered all over the body, which are mostly asymptomatic and begin before puberty. [80] This rare entity was first described by Eng et al. [87] and thereafter several familial clusters have been described by others. [88],[89]
Reticular erythematous mucinosis
Reticular erythematous mucinosis is one of the primary cutaneous mucinoses characterized by reticulate erythema classically involving the inter-mammary region [Figure 6]. [90] Involvement of face, abdomen, and groins has also been reported, so has been exacerbation with oral contraceptive use and during pregnancy. [91] The condition is asymptomatic, although photosensitivity is a feature. It most commonly affects middle-aged women and is generally not associated with systemic diseases. Histopathology shows deposition of mucin in the dermis with a round cell infiltrate. [92]
Hunter syndrome (mucopolysaccharidosis II, MPS II)
Hunter syndrome is an X-linked recessive lysosomal storage disorder due to deficiency of the enzyme iduronate-2-sulfatase. The clinical manifestations include short stature, large head, short neck, coarse facies, thickened tongue and lips, and mental retardation which is generally mild. Frequent upper and lower respiratory tract infections are attributed to enlarged adenoids and tonsils. Distinct cutaneous eruption consists of fleshy, ivory-white papules and nodules ("pebbling") in a ridging or reticular pattern, involving symmetrically the area between the angle of the scapula and the anterior axillary line. [93] The nape of the neck, the pectoral ridges, and the buttocks are the other sites affected. [94] They begin before the age of 10 years and disappear spontaneously. [95] Such pebbling is noted mainly in Hunter syndrome and serves a clinical marker for differentiating it from other MPS.
| Other Reticulate Dermatoses | | |
Erythema ab igne
Erythema ab igne is a condition that occurs due to repeated or prolonged exposure to infrared radiation of sub-threshold intensity (43 o C-47 o C) that is insufficient to cause burn. It begins as a reticulate erythema due to local hemostasis that becomes persistent over time. Later pigmentation develops [Figure 7], and telangiectasia and atrophy may also ensue. [96] It may occur at any age and affect either sex [97] in whom there is a history of repeatedly or habitually being exposed to heat, as in heating pads, fireplace, laptops, [98] or occupationally as in cooks, goldsmiths, and silversmiths. Histopathology is reminiscent of chronic actinic damage. Development of squamous cell carcinoma has been reported, [96] which tends to be aggressive.
Prurigo pigmentosa
Prurigo pigmentosa is a condition characterized by development of pruritic reticulate erythematous papules that leave behind hyperpigmentation in the same pattern. It is mostly seen among the Japanese. It predominantly affects middle-aged females and involves the trunk and neck more commonly. Associations with diabetes and anorexia have been reported, so has been aggravation during menses and pregnancy. [99],[100]
Reticulate lesions affecting the oral mucosa
Among this group, the classical examples include OLP and leukoplakia. A reticulate lacy pattern of white streaks (Wickham's striae) involving the buccal mucosa [Figure 8] is the most common form of OLP. Similar lesions may also affect the vaginal mucosa. Other morphological variants of OLP are atrophic, hypertrophic, erosive, and ulcerative patterns. Leukoplakia of the oral cavity presents as a whitish thickened plaque or reticulate streaks involving the buccal mucosa, soft palate, and tongue. The plaques are adherent and forceful removal causes bleeding. The condition is most often considered benign and is associated with chronic irritation (e.g., ill-fitting dentures), chronic smoking, tobacco chewing, etc., Transformation into invasive carcinoma is associated with high-risk factors like old age, female gender, soft palate involvement, non-homogenous morphology, and erythroplakia. [101],[102]
Neonatal lupus erythematosus
The most common cutaneous manifestation of neonatal lupus erythematosus (NLE) resembles lesions of sub-acute cutaneous lupus erythematosus of adults. NLE presenting as extensive reticulate erythema with atrophy, resembling cutis marmorata telangiectatica congenita, has also been reported. [103],[104],[105]
Hereditary angioedema
Hereditary angioedema is an autosomal condition characterized by recurrent episodes of angioedema associated with gastrointestinal symptoms. It occurs due to inherited deficiency of C1 esterase inhibitor. A reticulate erythematous rash resembling EM may occur prodromally in some familial cases. [106],[107]
Extensive congenital erosions and vesicles healing with reticulate scarring
This condition is characterized by presence of extensive superficial erosions all over the body at birth, which heals in a few days, leaving behind a rather conspicuous reticulate hyperpigmentation. It is a rare condition whose exact etiology is not known. However, it may indicate intrauterine insults. [108]
Atrophodermia vermiculata
It is also known as "atrophoderma reticulatum", "folliculitis ulerythematosa reticulata," and "honeycomb atrophy". It is characterized by symmetric reticulate or honeycomb atrophy of the cheeks that may extend to the ears and forehead. It is thought to be due to defective keratinization of pilosebaceous follicles. [109],[110]
Nekam's disease (keratosis lichenoides chronica)
It is a rare condition affecting the skin and mucous membranes characterized by reticulate or linearly arranged violaceous, keratotic papules, and nodules predominantly over the extremities and buttocks associated with a seborrheic dermatitis-like or rosacea-like eruption on the face. Its exact etiology is not known. Young adolescent males are commonly affected. Other associated features are recurrent oral aphthae, nail dystrophy, palmoplantar keratoderma, keratotic papules over the scrotum, and ocular manifestation. Treatment is difficult. [111],[112]
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What is new?
This review is an attempt to compile various reticulate dermatoses and categorize them based on the clinical features and underlying pathogenesis which would be helpful for diagnosis and management of such conditions.
[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6], [Table 7], [Table 8], [Table 9] |
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