Lipoma arborescens is a rare, benign intra-articular lesion characterized by diffuse replacement of synovial tissue by mature adipocytes, causing a villous lipomatous proliferation of the synovial membrane.1 Typically, this is a monoarticular condition, with the knee being the most commonly affected although it has been rarely reported to occur in an oligo-/polyarticular fashion and in…
Cannabis arteritis mirrors thromboangiitis obliterans in its clinical and arteriographic presentation, but its relevant exposure is cannabis rather than tobacco.1 Whether cannabis arteritis is a subset of thromboangiitis obliterans or a unique pathologic entity is debatable. Delta-9-tetrahydrocannabinol, the primary psychoactive component of cannabis, is a peripheral vasoconstrictor.2 This offers mechanistic insight into how cannabis may…
In certain ethnic populations and geographic locations, being a genetic carrier of sickle cell trait is common. Despite its prevalence, a recent report studied 100 mothers who were informed their newborn child had tested positive for sickle cell trait, and of these mothers less than half were aware of their carrier status prior to conception.1…
Sarcoidosis is a multisystem disease characterized by noncaseating granulomas in affected tissues, mostly involving the lungs and lymph nodes.1,2 The etiology of sarcoidosis remains unknown but is thought to be due to an inflammatory response to an antigen exposure in genetically predisposed individuals.1 Tumor necrosis factor-α (TNF‑α), a pro-inflammatory cytokine, plays an essential role in…
A 26-year-old woman presented to our emergency department (ED) with intermittent fevers, nausea and vomiting. She had a past medical history of well-controlled, anti-nuclear antibody positive and rheumatoid factor negative polyarticular juvenile idiopathic arthritis (pJIA) and Crohn’s disease. Her maintenance treatment consisted of monthly intravenous infliximab, 10 mg of oral methotrexate weekly and 20 mg…
A 44-year-old woman presented to the emergency department with bifrontal headaches that had started approximately one month earlier. She was diagnosed with migraines and discharged home. Three days later, the patient returned to the emergency department upon recurrence of her headaches, and this time she also reported abnormal leg movements. A computerized tomography (CT) scan…
Pulmonary nodules are common; most are benign, but the differential diagnosis is broad and includes life-threatening possibilities.1 Our patient is a former smoker who has a history of a complex autoimmune disease and multiple pulmonary nodules. This case was challenging, but clinical, radiographic and histologic clues helped lead to the correct diagnosis. Case Presentation The…
Retroperitoneal fibrosis (RPF) is a rare condition characterized by aberrant fibroinflammatory tissue developing in the retroperitoneum. This disorder was initially called Ormond’s disease. RPF may be idiopathic or secondary to other conditions. Idiopathic RPF is a part of the disease spectrum of chronic periaortitis due to its typical periaortoiliac localization. Idiopathic retroperitoneal fibrosis is a…
Intra-articular venous malformations of the knee are an uncommon cause of knee pain in children. Presenting symptoms of this rare subtype of venous malformation often include nonspecific pain and joint swelling, which may be episodic, and accompanied by limited range of motion. The signs and symptoms can mimic juvenile idiopathic arthritis (JIA). Timely diagnosis of…
Polyarteritis nodosa (PAN) is a systemic necrotizing vasculitis that typically affects medium-sized muscular arteries. The clinical subsets of PAN are idiopathic, generalized, secondary hepatitis B virus (HBV) associated and cutaneous PAN. These clinical subsets are important because of their therapeutic implications. Virtually any organ system can be affected in generalized PAN, but this vasculitis tends…