Blue Rubber Bleb Nevus Syndrome Clinical Presentation
- Author: Basil S Cherpelis, MD; Chief Editor: Dirk M Elston, MD more...
History
Patients with blue rubber bleb nevus syndrome (BRBNS) may present to the dermatologist because of cosmetic concerns. Most lesions of blue rubber bleb nevus syndrome are asymptomatic but some may be spontaneously painful or tender to palpation. Patients with blue rubber bleb nevus syndrome may note increased sweating on the skin overlying the lesion.
Physical complaints or symptoms in blue rubber bleb nevus syndrome vary depending on the organ system involved. Patients may report fatigue from occult blood loss. Hematemesis, melena or frank rectal bleeding may prompt emergent presentations. When bone is involved, there may be complaints of joint pain or impaired ambulation. Extracutaneous lesions also may result in epistaxis, hemoptysis, hematuria, or menorrhagia. Patients may present with blindness due to cerebral or cerebellar cavernomas that may hemorrhage into the occipital lobes.[3]
Physical
Physical findings in blue rubber bleb nevus syndrome (BRBNS) are divided into cutaneous and extracutaneous manifestations.
Cutaneous manifestations of blue rubber bleb nevus syndrome are as follows:
- Skin lesions are usually highly characteristic, as multiple, protuberant, dark blue, compressible blebs, a few millimeters to several centimeters in diameter and varied in hue and shape. They have the look and feel of a rubber nipple. Lesions may be few in number or range into the hundreds.
- Three types of cutaneous lesions have been described in blue rubber bleb nevus syndrome: (1) blue, rubbery, blood-filled sacs with a smooth or wrinkled surface that are easily compressible and promptly refill when pressure is released; (2) large, disfiguring, cavernous lesions that may compress vital structures; and (3) blue, irregular macules.
- The color of cavernous lesions may appear red, purple-red, blue, or black, and morphology varies from flat to elevated, occasionally pedunculated, nodules.
- Lesions may be tender to palpation, and overlying hyperhidrosis may be noted.
- Blue rubber bleb nevus syndrome skin lesions rarely bleed unless traumatized.
- Progression in size and number of blebs may occur with advancing age.
- The lesions are principally located on the upper limbs, trunk, and perineum, but they may occur anywhere.[4]
- Described in a 2008 report,[5]dermoscopic features include a superficial, light-red arborizing venous pattern or vessel dilations; maculae with nondefined borders predominantly on the palms and soles; red-purple nodules with lacunas separated by a white linear structure, corresponding to fibrous demarcations; and lesions with an exophytic, verrucous surface.
Extracutaneous manifestations of blue rubber bleb nevus syndrome are as follows:
- The visceral organ system most commonly affected is the GI tract. Vascular malformations may occur anywhere from oral to anal mucosa but predominantly occur in the small bowel. In contrast to the skin lesions, the GI lesions often bleed. They may spontaneously rupture causing acute hemorrhage and death. However, most bleeding from the GI tract is slow, minor, chronic, and occult, resulting in iron deficiency anemia from ongoing loss. A case of thrombocytopenia and disseminated intravascular coagulation has been reported in association with blue rubber bleb nevus syndrome. Other complications include intussusception, volvulus, and bowel infarction. These diagnoses should be considered in patients with blue rubber bleb nevus syndrome and abdominal pain.
- Orthopedic manifestations[6] include skeletal bowing, pathologic fractures, bony overgrowth, and articular derangement. Bone deformities may arise as a result of pressure effects from adjacent vascular lesions. Vertebral lesions have caused spinal cord compression and vertebral collapse, and the lesions may extend into joint spaces affecting range of motion.[7] Extensive lesions also have been reported on the feet, impairing ambulation. Debilitating enlargement occasionally requires amputation of the affected limb.
- Blue rubber bleb nevi have been reported in the skull, central nervous system, thyroid, parotid, eyes, oral cavity, lungs, pleura, pericardium, musculoskeletal system, peritoneal cavity, mesentery, kidney, liver, spleen, penis, vulva, and bladder.
- Recurrent thromboembolic events from shunts in visceral lesions led to the development of pulmonary hypertension in one case.[8]
Causes
The cause of blue rubber bleb nevus syndrome (BRBNS) is unknown. Most cases are sporadic, but autosomal dominance has been reported. Blue rubber bleb nevus syndrome has not been localized to a specific chromosome or gene defect.
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