Osteoid osteoma: A pathology that is confused with ankylosing spondylitis.

Osteoid osteoma is a small and benign osteoblastic tumor seen typically in males aged below 25 years. Although it is rarely seen in the vertebrae, it should be considered in the differential diagnosis of spondyloarthropathies, especially for those which occur in young people, along with back and lumbar pain, which increases during the night. Early diagnosis is essential to alle-viate symptoms and prevent the risk of structural spinal deformities, such as scoliosis.

, a new nematode species (Pratylenchidae: Tylenchomorpha) from the Great Plains region of North America.

is a new species of root-lesion nematode described from corn-soybean production fields in the Central Great Plains of North America. It is characterized by populations with relatively abundant males, two lip annuli, females with a round functional spermatheca and a conoid to subcylindrical tail with a non-crenate, smooth terminus. In host preference tests, corn and wheat produce the largest nematode populations, whereas sorghum and soybeans produce less than 20% the numbers observed on corn.

Cross-sectional imaging of congenital and acquired abnormalities of the portal venous system.

Knowing the normal anatomy, variations, congenital and acquired pathologies of the portal venous system are important, especially when planning liver surgery and percutaneous interventional procedures. The portal venous system pathologies can be congenital such as agenesis of portal vein (PV) or can be involved by other hepatic disorders such as cirrhosis and malignancies. In this article, we present normal anatomy, variations, and acquired pathologies involving the portal venous system as seen on computed tomography (CT) and magnetic resonance imaging (MRI).

A Rapidly Progressive Variant of Psoriatic Arthritis: Psoriatic Onycho-Pachydermo-Periostitis.

We present a case with psoriatic onychodystrophy, onycholysis, connective tissue thickening above the distal phalanx as well as specific radiologic changes diagnosed as psoriatic onycho-pachydermo-periostitis who responded dramatically to methotrexate with current literature review. In this article, we report a 53-year-old male patient with psoriatic onycho-pachydermo-periostitis who responded dramatically to methotrexate.