Chronic myeloid leukemia with pure erythroid leukemia blast crisis.

Chronic myeloid leukemia (CML), a myeloproliferative neoplasm defined by the presence of the BCR-ABL1 oncogene created by the reciprocal translocation t(9;22)(q34.1;q11.2), can often be controlled by medications that inhibit this constitutive tyrosine kinase. However, if these therapies fail, the disease may progress to a form resembling an acute leukemia. While most of these CML 'blast crises' are characterized by blasts with a myeloid (granulocytic) or lymphoid lineage, these blasts may rarely be predominantly erythroid. Cases of CML erythroid blast crises have been reported; however, secondary pure erythroid leukemia arising from a CML blast crisis has only been definitively reported once before. We report the second definitive case of pure erythroid leukemia with the t(9;22)(q34.1;q11.2) presenting as a CML blast crisis and characterize the morphologic, immunophenotypic, flow cytometric, cytogenetic, and molecular findings.

Isolated CNS Relapse in 2 High-Risk B-cell Acute Lymphoblastic Leukemia Patients Following SARS-CoV-2 Infection.

B-cell acute lymphoblastic leukemia (B-ALL) is the most common pediatric malignancy with a highly favorable overall prognosis. Central nervous system (CNS) relapse of B-ALL is relatively rare and is associated with inferior survival outcomes. We present two patients with B-ALL who developed isolated CNS relapse following confirmed infection with severe acute respiratory syndrome coronavirus 2. In addition to individual and disease factors, we posit that delays in therapy together with immune system modulation because of severe acute respiratory syndrome coronavirus 2 may account for these 2 cases of CNS relapsed B-ALL. We report on this clinical observation to raise awareness of this potential association.

Left Pulmonary Artery from the Ascending Aorta: A Case Report and Review of Published Cases.

The left pulmonary artery arising from the ascending aorta is an infrequent finding. It may be found isolated or with intracardiac anomalies. We present a new case of the left pulmonary artery arising from the ascending aorta and pool these findings with those of previously reported cases. Associated cardiac, extracardiac, and syndromic findings are discussed along with the implications of these in the evaluation and management of this condition.

Performance and Impact of a CLIA-waived, Point-of-care Respiratory PCR Panel in a Pediatric Clinic.

BACKGROUND: Laboratory-based respiratory polymerase chain reaction (PCR) panels are rarely used in outpatient pediatric practice due to prolonged turn-around times and cost of medical equipment. The BioFire FilmArray Respiratory Panel EZ (RP EZ) is a Clinical Laboratory Improvement Amendments-waived respiratory pathogen PCR panel which rapidly tests for 14 common respiratory organisms. The aim of this study was to identify the distribution of organisms seen in pediatric clinics and to determine if utilization of this point-of-care test improved disease management, while exploring impact on clinic workflow. METHODS: From January 2018 through January 2019, when clinically appropriate, patients were tested by the RP EZ and/or antigen tests (Clinic A) or antigen test only (Clinic B). Residual samples from Clinic B antigen tests were frozen and later tested on the RP EZ for definitive pathogen identification. Patient data and prescription records were extracted from the electronic health record. RESULTS: A total of 430 patients had RP EZ tests performed, and at least 1 organism was detected in 70.4% of patients. The most common organisms identified were human rhinovirus/enterovirus, influenza, and respiratory syncytial virus. Appropriate treatment occurred for 93.6% of patients when the RP EZ was performed (Clinic A) versus 87.9% of patients who had only antigen tests performed (Clinic B, P = 0.0445). Utilization of RP EZ testing also significantly reduced appointment duration time (48.0 versus 54.9 minutes, P = 0.0009). Three false-positive influenza B results were identified by antigen testing. CONCLUSIONS: A point-of-care PCR panel improved patient care by providing an accurate diagnosis and shortened appointment duration.

Case Report: Olecranon Bursitis due to Prototheca wickerhamii in an Immunocompromised Patient.

Human protothecosis is a rare algal infection caused by Prototheca; it is a ubiquitous achlorophyllic alga, which rarely causes human disease. Currently, the pathogenesis remains unclear and no treatment options have been elucidated. We present a case of olecranon bursitis caused by Prototheca wickerhamii in an immunocompromised patient. A 45-year-old man presented with left elbow pain after scraping his elbow on a tree. He reported significant pain and swelling of the elbow after injury, which resolved without intervention. He was diagnosed with HIV/AIDS infection and started on antiretroviral therapy. Afterward, he experienced recurrent elbow swelling and pain; an incision and drainage was performed and cultures demonstrated P. wickerhamii. Unsuccessful treatment with oral voriconazole led to an attempt at therapy with parental amphotericin and oral doxycycline; however the patient left against medical advice. He presented to our facility and both parental amphotericin and doxycycline were initiated with planned outpatient bursectomy. He clinically improved on that regimen but left against medical advice before completing his recommended course of IV amphotericin and oral doxycycline. Patients diagnosed with disseminated protothecosis can have a mortality rate upward of 67%. Given the rarity of this pathogen, no official treatment guidelines exist and there are few studies analyzing the antimicrobial susceptibility of Prototheca. Management is challenging because of slow-growing nature of the algae, paucity of research studies, and limited susceptibility of this pathogen. This case adds to the limited body of literature by demonstrating the clinical presentation of protothecosis and highlighting the pathology and current treatment options.

Eosinophilic Pancreatitis: A Rare Cause of Recurrent Acute Pancreatitis.

Eosinophilic pancreatitis is a rare form of recurrent acute pancreatitis that demonstrates distinct histologic features, including diffuse, periductal, acinar, and septal inflammatory infiltrates comprised of a pure or predominant population of eosinophils, eosinophilic phlebitis and arteritis, and localized eosinophilic infiltrates with pseudocyst formation. It is associated with elevated serum immunoglobulin E levels, an elevated eosinophil count with systemic manifestations, and eosinophilic infiltrates in other organs of the gastrointestinal tract. We present a case of eosinophilic pancreatitis in a 44-year-old man who was diagnosed after pancreatic resection for recurrent bouts of acute pancreatitis. While the gross and histologic evaluations matched other reported cases of eosinophilic pancreatitis, our patient had only minimal peripheral eosinophilia, no reported history of symptoms related to elevated eosinophilia or immunoglobulin E, and only mild eosinophilic infiltrates in his gallbladder.