Intramyofiber erythrocytes in skeletal muscle.

The authors describe the serendipitous discovery of clustered erythrocytes within myocytes in a biopsy obtained during repair of a torn tendon. Their perusal of the literature failed to uncover an analogous observation.

The fasciitis-panniculitis syndrome presenting as complex regional pain syndrome type 1: report of a case.

A 28-year-old man presented with a clinical picture suggestive of complex regional pain syndrome type I following a blow to the thenar eminence and thumb. Symptoms, including swelling of the hand and distal forearm, progressed until an amputation was carried out to rid the patient of an unendurable painful and nonfunctioning wrist and hand. The histologic evaluation of the amputation specimen showed: 1) dermal edema, perivascular dermatitis, and epidermal hyperkeratosis; 2) subcutaneous chronic inflammation with subtotal replacement of the adipose lobules by fibrous tissue associated with thickening of the muscular fascia, implying the fasciitis-panniculitis reaction pattern; 3) atrophy, degeneration, necrosis, and focal calcifications of the skeletal muscles; 4) phlebosclerosis, phlebectasias and lymphocytic arteritis; and 5) increased cortical porosity of the bones.

Pyogenic granuloma-like reaction in the necrotic, vessels-deprived femoral head of the rat.

Osteonecrosis of the femoral head was produced in rats by cutting the ligamentum teres and incising the cervical periosteum. As of the second postoperative week, fibrous tissue pervaded the necrotic epiphyses, macrophages and osteoclasts removed the debris, osteoblasts deposited lamellar-fibred and woven-fibred intramembranous bone, and remodeling began. In 16% of the rats killed during the 2nd postoperative week, the epiphyses contained big fragments of necrotic bone enclosed by densely packed, capillary-sized vessels.

Localization of vascular endothelial growth factor during the early reparative phase of the rats' vessels deprivation-induced osteonecrosis of the femoral heads.

The expedited revascularization of the rats' avascular, necrotic femoral heads suggests the operation of angiogenic factor(s). The blood circulation of the epiphysis was interrupted by cutting the cervical periosteum and the ligamentum teres of rats' femoral heads. Three days postoperatively, the marrow was necrotic.

Liesegang rings in hemorrhagic urine.

Myriad Liesegang rings were encountered in the urine of a 43-year-old patient who was diagnosed as having idiopathic hematuria, emanating from the left ureter or kidney. Erythrocytes and the Liesegang rings spontaneously disappeared from the urine within 4 weeks. We are unaware of a report of a similar observation.