Introduction/Objective Kidney injury has now become one of the known complications following COVID-19 infection and vaccination. Only few cases of minimal change disease following administration of COVID-19 vaccination and infection have been reported. This study was to highlight incidence of minimal change disease following COVID-19 infection or vaccination. Methods/Case Report Case 1:15 year-old female with past medical history of asthma and hypercholesterolemia presented for evaluation of periorbital edema, nephrotic-range proteinuria, hypoalbuminemia, elevated serum creatinine, elevated blood pressures, and hematuria after COVID-19 infection. Renal biopsy after 1 week of infection showed unremarkable glomeruli and negative immunofluorescent stains in glomeruli, and 20-30% fusion of foot processes. The biopsy was consistent with a minimal change disease with features of natural remission (her nephrotic-range proteinuria resolved soon after). Case 2: 18 year-old female with no significant past medical history presented with a chief complaint of generalized swelling, which started around the same time she received her 1st dose of Pfizer COVID vaccine (the 2nd dose 2 months later). She had a nephrotic range proteinuria and hypoalbuminemia, but normal level of serum creatinine. A renal biopsy after 4 months of vaccination showed unremarkable glomeruli by light microscopy, negative immunofluorescent study, but diffuse effacement of foot processes involving more than 80% of the examined loops by electron microscopy. This biopsy findings were consistent with a minimal change disease. Both patients did not receive any treatment before the renal biopsies. Results (if a Case Study enter NA) NA Conclusion Minimal change disease can be a rare complication following COVID-19 infection or Pfizer COVID-19 vaccination, raising a question if there are similar antigens induced by the infection or by the vaccination that trigger the minimal change disease. Further studies are needed to determine the incidence and pathophysiology of minimal change disease either post COVID-19 vaccines or following COVID-19 infections.

Background: Adult head and neck rhabdomyosarcoma (AHNRMS) is an exceedingly rare soft-tissue sarcoma. We describe a case of AHNRMS that was initially misdiagnosed as atypical fibroxanthoma (AFX). Methods: A 61-year-old male with a history of cutaneous squamous cell carcinoma (cSCC) of left face status post definitive radiation presented with a history of rapidly enlarging masses on the left face and nose. Patient had three large, exophytic masses on the left midface with limited local invasion. Initial pathologic evaluation revealed atypical fibroxanthoma (AFX). Results: Final histopathological and immunohistochemical evaluation after surgical resection of the specimen revealed high-grade cutaneous rhabdomyosarcoma. Patient underwent adjuvant chemoradiation therapy. Conclusions: Soft-tissue sarcomas have considerable overlap in histopathologic presentation, and our case highlights the importance of a thorough immunohistochemical evaluation. This case contributes to the current limited body of literature on cutaneous AHNRMS as well as radiation-associated sarcomas of the head and neck (RASHN).

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