Biomechanics and computer simulation of the Z-plasty.

Introduction: We compared the results of our computer simulation studies of Z-plasties of different design to those of earlier studies, such as laboratory studies in dogs.

Material And Methods: The contours of single Z-plasties of different designs on flat surfaces were transferred to finite element analytical software (ADINA version 8.7).

Merkel cell carcinoma on the upper lip of a 100-year-old woman.

Merkel cell carcinoma (MCC) is a rare skin tumor that usually occurs on the head, neck, or extremities of elderly patients; it has a high incidence of local recurrence, regional lymph node metastasis, and subsequent distant metastasis. We report a MCC that developed rapidly on the left corner of the upper lip of a 100-year-old woman. An incisional skin biopsy was performed to confirm MCC.

Atypical ulnar tunnel syndrome accompanied by sensory disturbance of the dorsal sensory branch of the ulnar nerve.

An atypical accessory abductor digiti minimi, which is morphologically a bicipital muscle, was the cause of the ulnar tunnel syndrome. A ganglion grew from the volar carpal joint at the same time and caused sensory disturbance of the dorsal sensory branch of the ulnar nerve.