Isolated cutaneous epithelioid hemangioendothelioma.
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Adult↗
Biomedical subjects
P Polk
Publications and source records attributed to P Polk.
Cutaneous protothecosis in association with the acquired immunodeficiency syndrome.
We report a case of protothecosis that occurred in the skin over the left tibial region of a 25-year-old man with the acquired immunodeficiency syndrome (AIDS). The lesion was noticed a few months after he swam in a lake in south Alabama. Biopsy and culture revealed Prototheca wickerhamii. We believe this is only the second reported case of cutaneous protothecosis in association with AIDS.
AIDS-Related Opportunistic Infections↗
Soft tissue oncocytoma.
We describe a case of a novel soft tissue neoplasm, composed of a monotonous population of cells. Their cytoplasm was parked with mitochondria, and had no immunohistochemical or ultrastructural evidence of differentiation. The neoplasm, located within the thigh of a 50-year old man, was well-circumscribed but unencapsulated. The patient was clinically free of neoplasm at 1 year follow-up, after complete local excision. We propose the term "soft tissue oncocytoma" for this lesion, because of the similarity of this neoplasm to oncocytomas of other reported sites.
Adenoma, Oxyphilic↗
Polypoid scrotal calcinosis: an uncommon variant of scrotal calcinosis.
Scrotal calcinosis is a rare condition characterized by multiple calcified nodules within scrotal skin. To our knowledge, only 67 cases have been reported to date. The etiology has been widely disputed and is viewed by many to be idiopathic. We describe a case of "idiopathic" scrotal calcinosis that not only presents a distinctly unusual clinical appearance, but also shows that at least some cases of this disease occur in association with dystrophic calcification of epidermal (follicular) cysts.
Adult↗
Invariant characteristics of gait initiation.
Studies were undertaken first to describe the invariant characteristics of gait initiation and second to better understand the function of each limb in the process of gait initiation. Analysis of variance indicated significant main effects for speed for time to onset of EMG activity and force plate recordings, time to swing toe-off and heel-strike and stance toe-off. However, when the dependent variables were expressed as a percentage of the initiation cycle, no significant main effects were noted. For the second study, two force plates were utilized, and reflective markers were placed on the sacrum and anterior superior iliac spines. The timing of heel-strike of the swing limb and toe-off of the stance limb showed a high degree of coordination in both experiments (r = 0.95 and 0.98). It was concluded that the relative invariance of selected parameters indicates that gait initiation is centrally programmed. It also appears that the swing limb, although forces were very small, is responsible for the initial weight shift to the stance limb and that the stance limb is then primarily responsible for the generation of momentum.
Adolescent↗