Multiple syringocystadenoma papilliferum arising from an extensive nevus sebaceous of Jadassohn: Case Report

We present an extensive nevus sebaceous of Jadassohn which was present at birth and had a rapid growth  during puberty. Multiple nodules of syringocystadenoma papilliferum developed on the plaque of nevus  sebaceous. The extensive nature of nevus sebaceous and numerous benign tumours is a therapeutic challenge  on the face. Currently there is no adequate evidence to support prophylactic excision of nevus sebaceous of Jadassohn, especially in people with skin of colo

Primary Malignant Amelanotic Melanoma Arising From a Vitiligo Patch of an African Tanzanian: Case Report

Skin cancer is rare in people of African origin while vitiligo occurs worldwide. The occurrence of primary malignant melanoma and vitiligo together is very rare. We present a rare case of primary malignant amelanotic melanoma arising from a depigmented patch of a patient with vitiligo. It was completely excised and followed for one year. No recurrence or metastases was noted during the follow up period

New Oldowan locality Sare-Abururu (ca. 1.7 Ma) provides evidence of diverse hominin behaviors on the Homa Peninsula, Kenya

The Homa Peninsula, in southwestern Kenya, continues to yield insights into Oldowan hominin landscape behaviors. The Late Pliocene locality of Nyayanga (~3–2.6 Ma) preserves some of the oldest Oldowan tools. At the Early Pleistocene locality of Kanjera South (~2 Ma) toolmakers procured a diversity of raw materials from over 10 km away and strategically reduced them in a grassland-dominated ecosystem. Here, we report findings from Sare-Abururu, a younger (~1.7 Ma) Oldowan locality approximately 12 km southeast of Kanjera South and 18 km east of Nyayanga. Sare-Abururu has yielded 1754 artifacts in relatively undisturbed low-energy silts and sands. Stable isotopic analysis of pedogenic carbonates suggests that hominin activities were carried out in a grassland-dominated setting with similar vegetation structure as documented at Kanjera South. The composition of a nearby paleo-conglomerate indicates that high-quality stone raw materials were locally abundant. Toolmakers at Sare-Abururu produced angular waste from quartz pebbles, representing a considerable contrast to the strategies used to reduce high quality raw materials at Kanjera South. Although lithic reduction at Sare-Abururu was technologically simple, toolmakers efficiently produced cutting edges, made few mistakes and exhibited a mastery of platform management, demonstrating that expedient technical strategies do not necessarily indicate a lack of skill or suitable raw materials. Lithic procurement and reduction patterns on the Homa Peninsula appear to reflect variation in local resource contexts rather than large-scale evolutionary changes in mobility, energy budget, or toolmaker cognition