Leukemia cutis | |
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Specialty | Dermatology |
Leukemia cutis is the infiltration of neoplastic leukocytes or their precursors into the skin resulting in clinically identifiable cutaneous lesions. [1] This condition may be contrasted with leukemids, which are skin lesions that occur with leukemia, but which are not related to leukemic cell infiltration. [1] [2] Leukemia cutis can occur in most forms of leukemia, including chronic myeloid leukemia, acute lymphoblastic leukemia, chronic lymphocytic leukemia, acute myeloid leukemia, and prolymphocytic leukemia. [3]
Aleukemic leukemia cutis occurs when cancerous white blood cells penetrate the skin before they are detected in the bone marrow or peripheral circulation. [4]
The clinical appearance of leukemia cutis varies, with the most common lesions being erythematous to violaceous papules or nodules (60%), followed by infiltrating plaques, generalized cutaneous eruption, and erythroderma. [5] Oftentimes, they have no symptoms. [6] Usually having a solid or rubbery consistency, the nodules might turn purpuric in patients who are thrombocytopenic. [5]
Unusual presentations include those that resemble ulcers, stasis dermatitis, guttate psoriasis, and figurate erythemas. Leukemia cutis has also been reported to localize to injuries, intravenous catheters, herpes lesions, and recent surgical procedures. [5]
Leukemia cutis may develop concurrently with the diagnosis of systemic leukemia, come first, or come later. Most cases of leukemia cutis occur in the context of an existing leukemia (44–77%) or at the time of systemic leukemia presentation (23–44%). [5] On rare occasions, leukemia cutis may occur before leukemia in the bone marrow or peripheral blood becomes observable. [7]
Leukemia cutis is linked to a number of gene abnormalities, such as chromosome 8 numerical anomalies, translocation (8; 21) (q22; q22), and inversion (16) (p13; q22). [8] [9]
Leukemic skin involvement's pathogenic mechanism is poorly understood. [10] Nonetheless, it's thought that chemokine receptors, adhesion molecules, and the genetic features of leukemia all have an impact. [11] Adhesion molecules, specifically chemokine integrin, may have a role in the migration of leukemic cells into the skin through processes known as skin-selective homing. [12] [13] Adhesion molecules and chemokine receptors may also have significant effects. On the dermal post-capillary venules, TARC (thymus- and activation-regulated chemokine)/CCL17 (CC chemokine ligand 17) and/or E-selectin may interact with the cutaneous leucocyte-associated antigen (CLA) receptor and CC chemokine receptor 4 (CCR4) on the leukemic cells. Leukemic cell migration and binding into the dermis may be facilitated by this process. Additionally, integrins and endothelial-bound chemokines may interact to promote leukemic cell migration into the dermis. [10]
Leukemia cutis is diagnosed by looking at the morphologic pattern of skin infiltration, cytologic characteristics, and most importantly the tumor cells' immunophenotype. The diagnosis is frequently confirmed by correlation with peripheral blood and bone marrow results as well as clinical data. [11]
Leukemia cutis is a localized symptom of a systemic underlying disease that requires systemic therapy tailored to the individual subtype of leukemia. Hematologic remission typically happens in tandem with a full or partial response to cutaneous infiltrations in the majority of individuals. [10] Local radiotherapy, however, may be employed in patients with resistant leukemia cutis or recurrent skin infiltration. [14] The treatment of refractory cutaneous leukemia has led to the proposal of simultaneous integrated boost with helical arc radiotherapy of total skin (HEARTS) for cutaneous symptoms. [15]
The prognosis is poor, with many patients suffering from additional extramedullary diseases and low survival rates. Most patients pass away months after being diagnosed. Patients without skin lesions who have acute myelogenous leukemia had a 30% survival rate after two years, but those with skin lesions have a 6% survival rate, which indicates an unfavorable prognosis for leukemia cutis. [5]
Leukemia cutis can occur anywhere between 2% and 30% of the time, depending on the underlying leukemia diagnosis. [10]
Mastocytosis, a type of mast cell disease, is a rare disorder affecting both children and adults caused by the accumulation of functionally defective mast cells and CD34+ mast cell precursors.
Tumors of the hematopoietic and lymphoid tissues or tumours of the haematopoietic and lymphoid tissues are tumors that affect the blood, bone marrow, lymph, and lymphatic system. Because these tissues are all intimately connected through both the circulatory system and the immune system, a disease affecting one will often affect the others as well, making aplasia, myeloproliferation and lymphoproliferation closely related and often overlapping problems. While uncommon in solid tumors, chromosomal translocations are a common cause of these diseases. This commonly leads to a different approach in diagnosis and treatment of hematological malignancies. Hematological malignancies are malignant neoplasms ("cancer"), and they are generally treated by specialists in hematology and/or oncology. In some centers "hematology/oncology" is a single subspecialty of internal medicine while in others they are considered separate divisions. Not all hematological disorders are malignant ("cancerous"); these other blood conditions may also be managed by a hematologist.
Lichen planus (LP) is a chronic inflammatory and autoimmune disease that affects the skin, nails, hair, and mucous membranes. It is not an actual lichen, but is named for its appearance. It is characterized by polygonal, flat-topped, violaceous papules and plaques with overlying, reticulated, fine white scale, commonly affecting dorsal hands, flexural wrists and forearms, trunk, anterior lower legs and oral mucosa. The hue may be gray-brown in people with darker skin. Although there is a broad clinical range of LP manifestations, the skin and oral cavity remain as the major sites of involvement. The cause is unknown, but it is thought to be the result of an autoimmune process with an unknown initial trigger. There is no cure, but many different medications and procedures have been used in efforts to control the symptoms.
Calcinosis cutis is an uncommon condition marked by calcium buildup in the skin and subcutaneous tissues. Calcinosis cutis can range in intensity from little nodules in one area of the body to huge, crippling lesions affecting a vast portion of the body. Five kinds of the condition are typically distinguished: calciphylaxis, idiopathic calcification, iatrogenic calcification, dystrophic calcification, and metastatic calcification.
A myeloid sarcoma is a solid tumor composed of immature white blood cells called myeloblasts. A chloroma is an extramedullary manifestation of acute myeloid leukemia; in other words, it is a solid collection of leukemic cells occurring outside of the bone marrow.
Mycosis fungoides, also known as Alibert-Bazin syndrome or granuloma fungoides, is the most common form of cutaneous T-cell lymphoma. It generally affects the skin, but may progress internally over time. Symptoms include rash, tumors, skin lesions, and itchy skin.
Sweet syndrome (SS), or acute febrile neutrophilic dermatosis, is a skin disease characterized by the sudden onset of fever, an elevated white blood cell count, and tender, red, well-demarcated papules and plaques that show dense infiltrates by neutrophil granulocytes on histologic examination.
Acute myeloid leukemia (AML) is a cancer of the myeloid line of blood cells, characterized by the rapid growth of abnormal cells that build up in the bone marrow and blood and interfere with normal blood cell production. Symptoms may include feeling tired, shortness of breath, easy bruising and bleeding, and increased risk of infection. Occasionally, spread may occur to the brain, skin, or gums. As an acute leukemia, AML progresses rapidly, and is typically fatal within weeks or months if left untreated.
Extramammary Paget's disease (EMPD) is a rare and slow-growing malignancy which occurs within the epithelium and accounts for 6.5% of all Paget's disease. The clinical presentation of this disease is similar to the characteristics of mammary Paget's disease (MPD). However, unlike MPD, which occurs in large lactiferous ducts and then extends into the epidermis, EMPD originates in glandular regions rich in apocrine secretions outside the mammary glands. EMPD incidence is increasing by 3.2% every year, affecting hormonally-targeted tissues such as the vulva and scrotum. In women, 81.3% of EMPD cases are related to the vulva, while for men, 43.2% of the manifestations present at the scrotum.
CCL17 is a powerful chemokine produced in the thymus and by antigen-presenting cells like dendritic cells, macrophages, and monocytes. CCL17 plays a complex role in cancer. It attracts T-regulatory cells allowing for some cancers to evade an immune response. However, in other cancers, such as melanoma, an increase in CCL17 is linked to an improved outcome. CCL17 has also been linked to autoimmune and allergic diseases.
Mast cell leukemia is an extremely aggressive subtype of acute myeloid leukemia that usually occurs de novo but can, rarely, evolve from transformation of chronic myeloid leukemia into the more aggressive acute myeloid leukemia. In a small proportion of cases, acute mast cell leukemia may evolve from a more progressive form of systemic mastocytosis. The diagnosis of acute mast cell leukemia by the WHO criteria includes the requirement for a prevalence of 20% neoplastic mast cells in marrow and 10% in blood. If the mast cells represent less than 10% of blood cells, the tumor is called "aleukemic" mast cell leukemia.
Tumid lupus erythematosus is a rare, but distinctive entity in which patients present with edematous erythematous plaque.
Solitary mastocytoma, also known as cutaneous mastocytoma, may be present at birth or may develop during the first weeks of life, originating as a brown macule that urticates on stroking. Solitary mastocytoma is a round, erythematous, indurated lesion measuring 1-5 cm in diameter. It can be mildly itchy or asymptomatic and develops over time. Predilection is the head and neck, followed by the trunk, extremities, and flexural areas.
Telangiectasia macularis eruptiva perstans (TMEP) is persistent, pigmented, asymptomatic eruption of macules usually less than 0.5 cm in diameter with a slightly reddish-brown tinge.
Alopecia mucinosa, also known as Follicular mucinosis, Mucinosis follicularis, Pinkus' follicular mucinosis, and Pinkus' follicular mucinosis–benign primary form, is a skin disorder that generally presents, but not exclusively, as erythematous plaques or flat patches without hair primarily on the scalp, neck and face. This can also be present on the body as a follicular mucinosis and may represent a systemic disease.
Blastic plasmacytoid dendritic cell neoplasm (BPDCN) is a rare hematologic malignancy. It was initially regarded as a form of lymphocyte-derived cutaneous lymphoma and alternatively named CD4+CD56+ hematodermic tumor, blastic NK cell lymphoma, and agranular CD4+ NK cell leukemia. Later, however, the disease was determined to be a malignancy of plasmacytoid dendritic cells rather than lymphocytes and therefore termed blastic plasmacytoid dendritic cell neoplasm. In 2016, the World Health Organization designated BPDCN to be in its own separate category within the myeloid class of neoplasms. It is estimated that BPDCN constitutes 0.44% of all hematological malignancies.
Blueberry muffin baby, also known as extramedullary hematopoiesis, describes a newborn baby with multiple purpura, associated with several non-cancerous and cancerous conditions in which extra blood is produced in the skin. The bumps range from one to seven mm, do not blanch and have a tendency to occur on the head, neck and trunk. They often fade by three to six weeks after birth, leaving brownish marks. When due to a cancer, the bumps tend to be fewer, firmer and larger.
Primary cutaneous anaplastic large cell lymphoma belongs to the group of cutaneous processes that are CD30+ lymphoproliferative and are characterized by autoregressive, recurrent, single or multifocal ulcerating nodules. Single or localized nodules, papules, or plaques are present in the majority of patients. However, a patient may have more than one lesion in up to 20% of cases.
Leukemids, also known as nonspecific cutaneous conditions associated with leukemia, are nonspecific skin lesions that occur with leukemia which are not related to leukemic cell infiltration. This condition may be contrasted with leukemia cutis, which is the infiltration of neoplastic leukocytes or their precursors into the skin resulting in clinically identifiable cutaneous lesions.
Lymphocyte-variant hypereosinophilia is a rare disorder in which eosinophilia or hypereosinophilia is caused by an aberrant population of lymphocytes. These aberrant lymphocytes function abnormally by stimulating the proliferation and maturation of bone marrow eosinophil-precursor cells termed colony forming unit-eosinophils or CFU-Eos.