The diagnosis of obstructive lymphedema typically relies upon the clinical presentation and physical findings. All of the subjects will be required to present a compatible history of acquired lymphedema, along with the following criteria: sustained, unilateral, conservatively-managed edema of the upper limb, with an increase of at least 20% in the measured volume of the affected extremity when compared with the contralateral, normal limb. In addition, the subject must have evidence of an abnormal bioimpedance ratio (L-Dex > 10 units). The subject must submit evidence of previous, completed complex decongestive physiotherapy and the ongoing use of an appropriately sized compression garment for daytime use. Ancillary use of nocturnal garments and/or pneumatic compression devices is acceptable, but not necessary. The subject must be eligible for surgical intervention.