Bat Coronaviruses
Bat Coronaviruses Chee Wah Tan Feng Zhu Akshamal Gamage Lin-Fa Wang INTRODUCTION Bats are the only flying mammals with more than 1,400 known species and are regarded as the second…
Molecular Biology of SARS-CoV-2
Molecular Biology of SARS-CoV-2 Roberto Patarca William A. Haseltine INTRODUCTION Coronaviruses are the largest group within the Nidovirales order that includes eleven families1 and pathogens of veterinary and medical importance….
Epidemiology of COVID-19
Epidemiology of COVID-19 Sten H. Vermund Mahima Kaur INTRODUCTION At the end of 2019, China reported a global outbreak of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome…
Cutaneous Adnexal Tumors
Case 1 History The patient is a 34-year-old female with a skin-colored 5-mm papule on her cheek near the nasolabial fold. Microscopic Findings Sections show a circumscribed dermal proliferation of…
Melanocytic Neoplasms
Case 1 History The patient is a 40-year-old male with a 6-mm darkly pigmented right forearm macule, which is circumscribed and has been unchanging. Microscopic Findings Sections demonstrate slight epidermal…
Vascular Neoplasms
Case 1 History The patient is a 1-year-old female who developed a solitary bright red plaque on the scalp that developed rapidly over a few weeks. Closer examination reveals a…
Tumors of the Muscle and Fat
Case 1 History The patient is a 54-year-old female with a painful, circumscribed, skin-colored papule on the chest. Microscopic Findings Sections show a dermal proliferation of spindle cells with a…
Granulomatous Dermatitis
Case 1 History The patient is a 52-year-old male with a recent history of reddish brown follicular papules and nodules on the central face. The patient reports flushing on drinking…
Fibrohistiocytic Tumors
Case 1 History The patient is a 55-year-old male with a brown papule on the left lower leg. Histopathology Microscopic sections show irregular pigmented epidermal hyperplasia with flattening of rete…
