Nasal Chondromesenchymal Hamartoma: CT and MR Imaging Findings

We report CT and MR imaging findings for a case of nasal chondromesenchymal hamartoma occurring in a 19-month-old boy. A nasal chondromesenchymal hamartoma is a rare benign pediatric hamartoma that can simulate malignancy. Although rare, knowledge of this entity is essential to avoid potentially harmful therapies

Serum total IgG and IgG4 levels in thyroid eye disease

Aileen Sy, Rona Z Silkiss Department of Ophthalmology, California Pacific Medical Center, San Francisco, CA, USA Purpose: To investigate the relationship between immunoglobulin G (IgG)4-related disease (IgG4-RD) and thyroid eye disease (TED) with respect to IgG levels. Patients and methods: A retrospective review of total IgG, IgG subclass, and thyroid stimulating immunoglobulin (TSI) levels in 24 patients with TED. Results: Five patients (20.8%) demonstrated serum IgG4 levels consistent with IgG4-RD without any additional systemic disease. Total IgG and IgG subclass levels were found to be an inadequate proxy for TSI elevation. Conclusion: There may be a subtype of TED patients with elevated IgG4 in the absence of IgG4-RD systemic findings. Keywords: thyroid eye disease, IgG subclass, IgG4, Graves’ disease, Graves’ ophthalmopathy, IgG4-R

The interaction between hyaluronidase and hyaluronic acid gel fillers - a review of the literature and comparative analysis

Hyaluronic acid (HA) is the most common component of aesthetic fillers. Many formulations exist, each exhibiting properties that are manifestations of individual molecular modifications. The enzyme hyaluronidase degrades hyaluronic acid and can therefore be injected into soft tissue to reduce suboptimally placed HA fillers or to reverse local ischemic complications. The clinically available varieties of hyaluronidase may be derived from crude animal extracts or genetically engineered from recombinant human DNA. Different HA fillers are not uniformly dissolved by a single source hyaluronidase, and hyaluronidase from different sources may have varying efficacy in the degradation of HA. Previous studies of subsets of HA fillers and hyaluronidases have provided limited and often conflicting data regarding these differences, and a more comprehensive scientific study is needed. In this review, the authors describe commonly available formulations of HA and hyaluronidase and review all studies of HA-hyaluronidase interaction available via a PubMed and Google Scholar search from 2005 to present, exploring trends in the data. Factors determined to confer increased resistance to degradation included higher concentration of HA, higher crosslinking density, and status as monophasic versus biphasic. Fillers of the Juvéderm family were generally found to be more resistant to degradation than members of the Restylane family. Results are less consistent for Belotero Balance. No variety of hyaluronidase was consistently superior at dissolving any variety of HA filler. More research is needed to clarify these clinically relevant relationships

Idiopathic sclerosing dacryoadenitis

Abstract Dacryoadenitis is an inflammation of the lacrimal gland. This condition has an extensive differential diagnosis, requiring a thorough workup to identify the underlying etiology. If no etiology is identified, the condition is termed idiopathic dacryoadenitis. The purpose of this report is to present a case of idiopathic sclerosing dacryoadenitis and review the diagnostic process. We present a case of sclerosing dacryoadenitis non responsive to systemic antibiotics and steroids, improving after surgical debulking/biopsy. Systemic inflammatory and infectious labs were negative. Tissue was negative for SARS-CoV-2 antigen. Histopathologic review of the surgical specimen revealed nonspecific, sclerosing dacryoadenitis, ultimately supporting the diagnosis of idiopathic nonspecific fibrosing dacryoadenitis. This case reviews the presentation, evaluation, and management of a common orbital pathologic condition, with updated recommendations based on the most current literature

Orbital lymphocyte populations in three states of thyroid eye disease

Purpose: We report histopathologic orbital tissue analysis from three patients with thyroid eye disease (TED) – active, chronic, and post-teprotumumab to better characterize orbital cellular populations in these varying states of TED. Observations: Orbital tissues in TED demonstrate minimal lymphocytic infiltration in fat and Mueller's muscle. Following teprotumumab treatment, the tissues were devoid of lymphocytes with only perivascular cuffs of T-lymphocytes remaining in orbital fat. Conclusions and importance: In active TED, post-teprotumumab treatment, and in quiescent TED, orbital fat may not show significant inflammatory infiltration. More work is warranted to characterize specific cellular effects of teprotumumab and other biologics