Histological Features of the Nasal Passage in Juvenile Japanese White Rabbits

Rabbits are sometimes used for intranasal toxicology studies. We investigated the postnatal development of the nasal passage in juvenile Japanese white rabbits from just after birth to 6-week-old to provide information for conducting intranasal toxicological evaluation using juvenile animals. On postnatal day (PND) 1, the nasal passage consisted of the septum with mostly cartilaginous nasal wall and turbinates. The lining squamous, transitional, respiratory, and olfactory epithelia were already distributed similar to adults and were still underdeveloped. The nasal passage gradually expanded with age, as did the nasal wall, including the turbinates formed by endochondral ossification. The maxilloturbinate elongated, during which it branched complexly. The respiratory epithelium takes the form of columnar epithelium together with a reduction in goblet cells. In addition, the olfactory epithelium had clear cytoplasm in the ethmoturbinate, the olfactory nerve bundles thickened, and Bowman’s gland acini increased in size and number. Other tissues, including the vomeronasal organ, nasal-associated lymphoid tissue, and nasolacrimal duct, also developed histologically with age. This investigation characterized the postnatal histological development of the nasal passage in Japanese white rabbits, providing basic knowledge regarding the histological examination and rationale for appropriate study design of intranasal toxicology studies in juvenile rabbits.

Left parathyroid adenoma with features of brown tumor, incidental finding: a case report

Primary hyperparathyroidism (PHPT) occurs in a setting of excessive parathyroid hormone (PTH) secretion with an autonomous parathyroid gland which resulting in hypercalcemia. Cases of parathyroid adenoma are rare, PTH is a chief regulator of calcium homeostasis in the human body. PHPT could be caused by solitary adenomas, hyperplasia, multiple adenomas and carcinomas. A 35-year-old female who came in with complaints of left hip pain past 1 month which aggravated since 1 week, with previous medical history of hyperthyroidism. Laboratory and biochemical findings suggested features of PHPT. She underwent left parathyroid excision with subtotal thyroidectomy. Histopathology analysis revealed features of parathyroid adenoma with eosinophilic to clear cytoplasm, few foci with oxyphilic nodules. Patient showed significant fall in PTH levels after tumor excision and is being discharged 5th day after surgery. PHPT occurs at any age, but it is most commonly seen in people over the age of 50 years and postmenopausal women. The current presentation of PHPT shifts from the classical symptomatic form to the asymptomatic form. parathyroidectomy is still the treatment of choice for both symptomatic and asymptomatic forms. Parathyroid adenoma has an excellent prognosis with surgical treatment.

Cytomorphologic Features of Extramammary Paget’s Disease of The Vulva in a patient with history of Squamous Cell Carcinoma of The Cervix, Status Post Chemoradiation and Neoadjuvant Therapy. The Importance of Basic Principles

Introduction/Objective Extramammary Paget disease (EMPD) is a rare neoplasm commonly affects postmenopausal women. It usually presents in the anogenital area where apocrine sweat glands are abundant, most commonly in the vulva. The disease is characterized by slow grow and high local recurrence rates. Clinically, EMPD present as well demarcated erythematous lesion or plaques that may ulcerated. Microscopically, it shows a group of atypical cells with abundant clear cytoplasm and nuclear pleomorphism. Methods/Case Report Here in we present a 58-year-old female with history of vulvar intraepithelial neoplasia III (VIN III) status post wide local excision, and poorly differentiated squamous cell carcinoma status post radical hysterectomy and bilateral salpingo-oopherectomy and chemoradiation who presented for perineal pain, itching and discomfort. She also noticed skin changes on her left labia without bleeding or discharge. Punch biopsies of the vulva and periurethral areas revealed acanthosis of the epidermis with intraepidermal scattering of single or clusters of large cells with round/ovoid nuclei and abundant clear cytoplasm. The cells are positive for p16, CK19, CK7, PAX8 supporting the diagnosis of EMPD without evidence of dysplasia. The concurrent PAP smear shows hypercellular specimen composed of hyperchromatic fragments of tissue with high nuclear-to-cytoplasmic rations, and apoptotic bodies. The presence of intracytoplasmic mucin and the tridimensionality of the fragments supported the diagnosis of adenocarcinoma. The HPV testing was positive for HPV-16. Results (if a Case Study enter NA) N/A Conclusion This study compares the histological and cytomorphological features of EMPD with high-grade squamous intraepithelial lesion (HSIL), since the molecular pathways, precursor lesions, etiologic associations, staging, clinical treatment, and prognosis differ substantially and may have a significant clinical impact for the patient’s treatment.

Burkitt’s Lymphoma of the Right Jaw in a Child: The Radiographic Features and Case Report

Burkitt’s lymphoma is a tumor that most often affects the jaws, most commonly seen in endemic areas of Africa, although the jaws are affected in about 15-18% in non-endemic regions, with prevalence in boys aged between 4-7 years. This is a 12-year-old male child that presented with right jaw painful swelling for more than six-months duration of onset. He was referred for plain radiographs of the jaw from a peripheral healthcare center. The jaw radiograph was done in anterior-posterior and oblique views of both sides respectively. The radiographs demonstrated a soft tissue density mass on the right, with associated destructive lytic lesion involving the right maxilla severelyand the right mandibleto a lesser extent. There is associated loss of lamina dura with severe dental anarchy involving the maxilla. The mandible showed lytic and expansile areas in its body with marked periosteal reaction; the sunray appearance. The contralateral maxilla and mandible have normal appearances. Complementary abdominal ultrasonography revealed normal appearances excluding abdominal involvement. Histology revealed the classic diffuse starry-sky appearance with benign histiocytes containing abundant, clear cytoplasm dispersed among a background of homogeneous, basophilic tumor cells, in keeping with Burkitt’s lymphoma. We report this case to describe the radiographic appearance of Burkitt’s lymphoma of the jaw bones.

Axillary fibromatosis with radiological-pathological correlation: a case report and literature review

Background The term fibromatosis refers to a spectrum of soft tissue tumors resulting from the unbridled proliferation of fibroblasts, with high infiltrative power. It is a rare neoplasm, with an incidence of about 3 cases per million. Most common sites include the abdominal wall and cavity, chest wall, scapular area, and the limbs, rarely affecting the axilla. Imaging plays a major role in surgical planning and clinical follow-up. Differential diagnosis with other soft tissue tumors may be arduous, but a correct evaluation is fundamental. Case presentation A 33-year-old case is reported for the evaluation of a palpable hardened and immobile left axillary nodule. The ultrasound reveals a solid, elongated, heterogeneous, poorly delimited, infiltrative lesion observed in the left axillary hollow, with no detectable flow in the color Doppler mode. At magnetic resonance imaging, the same elongated and expansive lesion was better defined, revealing its irregular contours, alternating areas of hypo- and hyperintense on T2, heterogeneous enhancement, and no signs of signal decay on in- and out-of-phase sequences. Due to its growth and local invasion potential, surgical excision was performed. The microscopic analysis showed long and uniform spindle cell fascicles, with clear cytoplasm and wavy nuclei, arranged in different directions, included in collagen stroma. Immunohistochemistry was positive for nuclear beta-catenin, confirming the diagnosis of fibromatosis. Conclusion Imaging methods reflect the heterogeneous nature of the lesion. This study demonstrates the importance of using a multidisciplinary approach in addition to imaging tests and histopathological study for better diagnosis and therapeutic planning. The high infiltrative power always must be reminded of, since it affects young patients and diagnosis delay can lead to mutilating surgeries.

Cutaneous Lymphadenoma: A Case of Recurrence after Shave Excision

Cutaneous lymphadenoma (CL) is a rare skin tumor supposedly derived from the pilosebaceous unit. Since its description in 1987, fewer than 60 cases have been documented. Herein we report a case of CL presenting as a small nodule on the forehead of a young female. The lesion recurred two years after shave excision of a similar lesion. The histopathological examination revealed interconnected islands, sheets, and trabeculae consisting of two distinct types of cells within a sclerotic stroma, a peripheral rim of palisading basophilic cells, and central epithelial cells with eosinophilic to clear cytoplasm. A dense infiltration with prominent lymphocytes and few plasma cells dominated the stroma and permeated the epithelial nests. This case represents the recurrence of this type of skin tumor after shave excision and thus highlights the importance of complete margin-free excision of such lesions.

Clear Cell Morphology in a Salivary Gland Tumor - Clearly a Morphological Dilemma

Primary salivary gland tumors with clear cell morphology comprise an uncommonly encountered subgroup of salivary gland neoplasm. Clear cell morphology is a known feature in both benign and malignant salivary gland tumors. Oncocytomas are uncommon tumors of the salivary gland. They have an abundance of mitochondria, which is manifested as granular eosinophilic cytoplasm by light microscopy with presence of cytoplasmic glycogen. Fixation artifact can impart cytoplasmic clearing and oncocytomas with a predominance of clear cytoplasm are labeled Clear cell oncocytomas. Accurate diagnosis of salivary gland tumors can be challenging because of the many diagnostic entities, extensive morphologic overlap, and the rarity of most tumor types. Here we report a case of Clear cell salivary oncoctyoma which was confirmed by Immunohistochemical markers by excluding morphological differential of Clear cell myoepithelioma.

New Names for Old Tumors

Objectives Previous studies described “clear cell” hepatocellular carcinoma (HCC), although definitions have varied. New clear cell subtypes of HCC have been proposed, including chromophobe (C-HCC), steatohepatitic (SH-HCC), and steatotic (S-HCC), and this study assessed the utility and clinical-pathologic profile of these subtypes. Methods Current histologic definitions, including 3 separate proposed definitions for SH-HCC, were applied to tumors previously characterized as clear cell HCC. Histologic and clinical variables were analyzed. Results Of 66 HCCs, 51 (77%) were classified using modern definitions, including 34 SH-HCCs, 15 S-HCCs, and 2 C-HCCs. Compared with the most permissive SH-HCC definition, the other 2 definitions designated 30 and 25 SH-HCCs (−12% and −26% cases, respectively). Unsurprisingly, S-HCC and SH-HCC were associated with steatotic clear cells (P < .0001). S-HCC was also more typically early type and low grade (P = .0017). The remaining unclassified clear cell HCCs were associated with flocculent (rather than steatotic or optically clear) cytoplasm (P < .0001) but otherwise demonstrated no discrete clinical-pathologic profile. Conclusions Current definitions could be used to reclassify the majority of “clear cell” HCCs. The subtypes are significantly correlated with a few variables, suggesting valid differences of the subtypes, although additional study is warranted, particularly to standardize the definition of SH-HCC.

CD10-Positive Cutaneous PEComa: An Extremely Rare Skin Tumour

We here present the case of a 67-year-old woman with a history of a slowly progressive, polypous nodule on her left wrist. The lesion was excised, and the histological analysis revealed a clear cell tumour that was relatively sharply demarked from the surrounding tissue extending into the subcutaneous tissue. The tumour showed a characteristic trabecular pattern in which the tumour cells were arranged around numerous vessels. The neoplastic cells had a predominantly epithelioid shape, granular eosinophilic to clear cytoplasm and prominent centrally located nucleoli. The histological differential diagnosis included a metastatic clear-cell renal cell carcinoma and a primary cutaneous perivascular epithelioid cell tumour (PEComa). Immunohistochemically, the tumour cells revealed homogenous expression of HMB-45, MiTF and CD10, whereas MART-1 and S100 were negative. Antibodies against actin marked the trabecularly arranged vessels, and the neoplastic cells yielded a patchy positivity against actin and desmin. Additional immunohistochemical stains against pan-cytokeratin, CAIX, PAX-8 and EMA were negative. Based on the morphologic and immunophenotypic findings, the histological diagnosis of a CD10-positive cutaneous PEComa was made.

Primary sinonasal renal cell-like adenocarcinoma: a case report and review of the literature

BackgroundPrimary sinonasal renal cell-like adenocarcinoma (SNRCLA) is an extremely rare neoplasm with unique clinical and pathological features. At present, there is no summary of its clinical and pathological characteristics. We treated one case and reported to here. Review the domestic and foreign literature, summarize its clinical pathological characteristics and diagnosis and treatment.CaseA 69-year-old female presented with repeated epistaxis, nasal obstruction of 2-years’ duration. Computed tomography (CT) was performed revealing an irregular mass of the right nasal cavity involving choana and nasopharynx. The patient was treated with endonasal endoscopic resection. Histologically, SNRCLA was very similar to clear cell renal cell carcinoma (RCC), the tumor cells were round or polygonal in size with abundant clear cytoplasm and uniform nuclei. The tumor cells positive for CK7, Vimentin, EMA, S-100, Ki-67 (5% +) and negative for CEA, P53, P63 by immunohistochemical staining,. The patient is free from recurrence over 27 months after the surgery.ConclusionSNRCLA seems to be a low-grade localized carcinoma associated with favorable prognosis. Surgical resection is recommended as the main stay of treatment.