Indolent T-cell Lymphoproliferative Disorder of the Gastrointestinal Tract Mimicking Crohn's Disease.

Indolent clonal T-cell lymphoproliferative disorder (iCTLD-GI)/indolent T-cell lymphoma of the gastrointestinal tract (iTLP-GI) poses diagnostic challenges, and despite its rarity, accurate diagnosis is crucial for appropriate management. We report the case of 34-year-old female with a 19-year history of gastrointestinal symptoms suggestive of inflammatory bowel disease (IBD). Subsequent evaluation revealed iCTLD-GI/iTLP-GI with extensive Crohn's disease-like morphological alterations, previously unreported. These macroscopic and microscopic aspects underscore the need for a comprehensive evaluation to avoid misdiagnosis with IBD. Additionally, molecular studies have identified potential therapeutic targets, highlighting the evolving management strategies. This case underscores the diagnostic complexity of iCTLD-GI/iTLP-GI, especially when the condition mimicks IBD such as Crohn's disease.

Beyond diagnosis: exploring the significance of IgG4+ plasma cell count through immunostaining in IgG4-related disease.

OBJECTIVES: To evaluate whether the grade of IgG4+ plasma cell infiltration in biopsies is associated with clinical or serologic outcomes in IgG4-RD. METHODS: We included 57 patients with biopsy proven IgG4-RD according to the Comprehensive Diagnostic Criteria and/or the 2019 ACR/EULAR Classification Criteria. We collected histological, clinical (disease duration, phenotype, remission and relapses) and serological variables. RESULTS: 29 (50.9%) patients were men, mean age 49.9 years, with a median disease duration of 22 months. The distribution among clinical phenotypes were 14% pancreato-hepato-biliary, 12.3% retroperitoneal/aortic, 29.8% head and neck-limited, 29.8% Mikulicz/systemic and 14% undefined. Thirty-nine patients had a proliferative and 18 a fibrotic phenotype. Most biopsies were from lacrimal gland, lymph node, pancreas, orbit, kidney, retroperitoneum and thyroid gland. Thirty-nine (68.4%) patients had <100 IgG4+ plasma cells/HPF and 18 (31.6%) ≥100 IgG4+ plasma cells/HPF. Patients with ≥100 IgG4+ plasma cells/HPF were more likely to belong to the pancreato-hepato-biliary and the proliferative phenotypes, had fewer relapses and a higher remission rate. On multivariate analysis, the OR for remission at last follow-up was 6.7, 95% CI 1.1-4.42, p=0.03. The log-rank test showed a difference in relapse-free survival between the two groups (HR 2.6, 95% CI 1.2-5.6, p=0.01). According to the ROC analysis, patients with more than 61 IgG4+ plasma cells were less likely to relapse. CONCLUSIONS: A count of ≥100 IgG4+ plasma cells/HPF may identify patients with a proliferative phenotype, fewer relapses and a higher remission rate.

Impaired glucose tolerance with neurological manifestations in insulinoma.

Insulinoma may have an atypical presentation and it should be suspected in patients with neurological manifestations in spite of an atypical insulin and proinsulin levels associated with hypoglycemia. Fast test is an important tool to reach the diagnosis.

Major salivary gland enlargement in IgG4-related disease is associated with multiorgan involvement and higher basal disease activity.

Objective: To evaluate if major salivary gland enlargement in patients with IgG4-related disease (IgG4-RD) is associated with systemic involvement.Methods: We included 47 patients with diagnosis of IgG4-RD. We retrospectively collected demographics, organ involvement, disease activity and damage assessed by the IgG4-RD Responder Index (IgG4-RD RI) and treatment.Results: 25 patients (53%) were men, mean age 50.8 years and median disease duration 27 months. Most frequently anatomic sites affected were lymph nodes 55%, pancreas 51% and lacrimal glands 43%. We observed major salivary gland involvement in 22 (46.8%) patients. When we compared patients with (n = 22) vs. without (n = 25) salivary gland enlargement, the first group had a higher number of affected organs, a higher prevalence of lacrimal glands, lymph nodes, and lung involvement, rheumatoid factor positivity, azathioprine and prednisone use, as well as a higher baseline IgG4-RD RI and a longer delay in diagnosis. At logistic regression analysis we found an association of major salivary gland enlargement with the basal IgG4-RD RI (OR 1.37, 95%CI 1.09-1.61, p = .001) and with lacrimal gland involvement (OR 34.7, 95%CI 4.6-258, p = .001).Conclusion: Our study highlights the systemic nature of IgG4-RD. Patients with major salivary gland enlargement should be routinely screened for multi-organ disease.

A Nondilated Main Pancreatic Duct Predicts Type 2 Autoimmune Pancreatitis: Comparative Study of Resected Pancreatic Head Masses.

BACKGROUND: Chronic pancreatitis (CP), pancreatic cancer (PCa), and autoimmune pancreatitis (AIP) often present as a pancreatic mass. Accurate diagnosis is not always possible; up to 8% of surgical procedures are performed in benign pancreatic masses presumed to be malignant. OBJECTIVES: We aimed to compare clinical and imaging characteristics of resected focal type 2 AIP, CP, and PCa and identify factors that could improve preoperative differential diagnosis. METHODS: Charts from patients that underwent pancreatic resection under suspicion of PCa between 2000 and 2014 were reviewed. Clinical and imaging data were recorded. Subjects were grouped as type 2 AIP, CP, and PCa. RESULTS: We included 79 cases; 41 men, mean age of 57.3 years/old ± 15.6 SD. Pathology report was type 2 AIP (20%), CP (10%), and PCa (70%). According to international consensus criteria for AIP 11 cases were deemed probable type 2 and 5 as unspecific pancreatic mass. A nondilated main pancreatic duct (MPD) was associated with AIP (OR 9.3; 95% CI 3.05-28.7), p < 0.001; obstructive jaundice (OR 28.5; 95% CI 8.18-79.5); and a dilated MPD (OR 5.21; 95% CI 1.9-14.6) suggested malignancy. CONCLUSIONS: In the setting of undetermined pancreatic focal mass, a nondilated MPD suggests the diagnosis of type 2 AIP.

Malignant Shamblin III Carotid Body Tumors Resected with Use of the Retrocarotid Dissection Technique in 2 Patients.

Carotid body tumors are rare neoplasms with malignant potential in 6% to 12.5% of cases, and surgical resection is the only cure. We present the cases of 2 female patients who had expanding, painless, right-sided neck masses; computed tomographic angiograms revealed Shamblin III tumors at the carotid bifurcation. Each patient underwent tumor resection with use of the retrocarotid dissection technique. The tumor specimens were histologically consistent with malignancy, and free margins were achieved. The patients remained free of symptoms, local recurrence, and metastasis 44 and 19 months after their respective procedures. These are the first malignant Shamblin III carotid body tumors that we have resected by means of retrocarotid dissection. In addition to our patients' cases, we discuss carotid body tumors and compare the retrocarotid and standard caudocranial resection techniques.

Phosphaturic mesenchymal tumors. Survey of 8 cases from a single Mexican medical institution.

Phosphaturic mesenchymal tumor (PMT) is a morphologically heterogeneous soft tissue and bone neoplasm, producing a paraneoplastic syndrome due to phosphate wasting. These tumors produce fibroblast growth factor 23, which is implicated in renal tubule phosphate loss. Medical records of patients seen from 1999 to 2013 with osteomalacia associated or not with a tumor were reviewed. Clinical and laboratory data, radiographic studies, and follow-up of 8 patients were tabulated. Histologic features and the immunoprofile of the tumors were analyzed. There were 208 patients with osteomalacia, but only 8 (3.84%) had osteomalacia associated with a tumor. The median age of the patients was 40 years. The tumor size ranged from 1.5 to 4 cm. Five were located in soft tissues and skin; and 3, in bones. Osteomalacia symptoms lasted from 2 to 14 years with a median of 6 years. Laboratory data showed hypophosphatemia and phosphaturia in all patients. All tumors were histologically benign. Histologically, the salient features were a hemangiopericytoid pattern, chronic hemorrhage, and microcystic areas. All neoplasms were diffusely positive for vimentin and focally positive for epithelial membrane antigen, CD34, and S-100 protein. Ki-67 was positive in approximately 10% of neoplastic cells in 2 cases and less than 1% in the remainder. We report 8 cases of PMTs producing osteomalacia, from a single third-level Mexican medical institution. These tumors occurred in soft tissues, skin, and bones. All tumors were benign, small, not easily detected by physical examination and diagnosed due to the metabolic abnormalities.

Spindle epithelial tumor with thymus-like differentiation of the thyroid (SETTLE): Report of two cases (one associated with a parathyroid adenoma).

Spindle epithelial tumor with thymus-like differentiation (SETTLE) is a rare tumor usually localized in the thyroid gland and perithyroid tissues. It is considered to arise from ectopic thymic tissue or branchial pouch remnants. It occurs more frequently in children and adolescents. We report 2 cases of spindle epithelial tumor with thymus-like differentiation localized in the thyroid gland, and 1 of them was associated with a parathyroid adenoma. We emphasize the need for a close and long-term follow-up in these patients.

Thyroid-like cholangiocarcinoma of the liver: an unusual morphologic variant with follicular, trabecular and insular patterns.

We report the case of a 26-year-old woman with a 19 cm malignant hepatic neoplasm with morphological features that closely resembled a follicular thyroid carcinoma. Despite this, it was interpreted as a cholangiocarcinoma due to the absence of a primary thyroid tumor and the lack of thyroglobulin and TTF-1 immunoreactivity by the hepatic tumor. The left hepatic lobectomy specimen showed an encapsulated and multinodular gray-white mass with cystic and hemorrhagic areas. Microscopically, it displayed predominant macro and microfolicullar patterns with focal solid, trabecular and insular areas. The small and distended follicles contained a colloid-like secretion and were lined by low cuboidal cells with scant cytoplasm, round or oval hyperchromatic nuclei with fine chromatin. The solid areas, trabecular and insular structures were similar to those of follicular or papillary thyroid carcinomas. In addition, some of the neoplastic cells had clear nuclei with occasional grooves. The tumor was positive for cytokeratin (CK) 7, CK 19 and CD138, and negative for TTF-1, thyroglobulin, Hepar-1, Glypican-3, alpha-fetoprotein and neuroendocrine markers. A thyroid neoplasm was excluded clinically and by ultrasound and computed tomography. Although, the residual hepatic parenchyma was initially not cirrhotic, the patient eventually developed cryptogenic cirrhosis. The patient received adjuvant chemotherapy and died of metastatic disease 18 months after surgery. The thyroid-like pattern broadens the morphologic spectrum of cholangiocarcinoma.

Inflammatory myofibroblastic tumor of the liver.

 Hepatic inflammatory myofibroblastic tumors are uncommon low grade malignant neoplasms. They can be confused clinically and by imaging studies with abscess.

Clinical and Immunopathologic Profile of Mexican Patients with IgG4 Autoimmune Pancreatitis.

Autoimmune pancreatitis is part of the spectrum of IgG4-associated diseases. Its diagnostic criteria and histological subtypes have been formally proposed recently and although based on current data it has been suggested that there are differences in clinical presentation among populations, more research is needed to properly establish if this heterogeneity exists. In this paper, we describe 15 cases of autoimmune pancreatitis diagnosed at a Mexican centre of reference, all of them associated to the lymphoplasmocytic sclerosing pancreatitis variant. The mean age at the onset of symptoms was 47.5 ± 14.4 years, and 53% of patients were male. The main manifestations were weight loss (87%), obstructive jaundice (53%), and acute (27%) and chronic (27%) pancreatitis. Only 20% of patients had high IgG4 serum levels at the time of diagnosis. All patients receiving prednisone responded favourably, both in their pancreatic and extrapancreatic manifestations. Clinical manifestations of Mexican patients showed certain differences with respect to those usually reported.

Multiple venous and arterial thromboses of the gallbladder causing acute cholecystitis. A previously undescribed complication of essential thrombocythemia.

Well established complications of essential thrombocythemia are multiple thrombohemorrhagic phenomena in various abdominal organs. We describe the case of a 22 year old man with essential thrombocythemia and thrombosis of the mesenteric and splenic veins as well as cavernomatous transformation of the portal vein. The patient also had a splenic infarction and a subphrenic hematoma. Additionally, he developed signs and symptoms of acute cholecystitis which in turn led to an open cholecystectomy. The gallbladder had a markedly thickened wall due to multiple recent and recanalized thrombi predominantly in subserosal veins. Only a few arteries were occluded by thrombi. A marked vascular proliferation in the subserosal connective tissue mimicking a hemangioma was most likely the result of collateral circulation. There was also a mild acute and chronic inflammatory infiltrate and edema in the lamina propria of the gallbladder. Hyperplasia of interstitial cells of Cajal in the lamina propria and between smooth muscle cells and proliferation of nerve trunks in the subserosal connective tissue adjacent to the thrombosed veins and arteries was also noted. To our knowledge this unique gallbladder thrombotic complication of essential thrombocythemia has not been previously reported.

Inverted urothelial papilloma of the urinary bladder with focal papillary pattern: a previously undescribed feature.

We report 2 examples of inverted urothelial papillomas with a focal papillary pattern. Both patients, a 43-year-old man and a 13-year-old adolescent boy, presented with hematuria. In addition to the characteristic trabecular endophytic growth pattern and bland cytologic features, the tumors showed focal papillary architecture in the endophytic component. Because of this feature, both tumors were misinterpreted as papillary urothelial carcinoma with inverted pattern. However, the papillary fronds were similar to those of exophytic urothelial papilloma. They were lined by 3 to 8 layers of normal-appearing urothelial cells often covered by a continuous or discontinuous layer of superficial (umbrella) cells. Although follow-up is limited, the 2 patients have remained asymptomatic. The recognition of papillary structures in urothelial inverted papilloma broadens the morphological spectrum of this unusual benign urothelial neoplasm and complicates the microscopic interpretation of urothelial lesions with inverted growth patterns. Surgical pathologists should be aware of this unusual feature of inverted urothelial papilloma of the urinary bladder to avoid misinterpretation with urothelial carcinoma with an inverted pattern.

Unusual metastases of papillary thyroid carcinoma: report of 2 cases.

We present 2 cases of papillary thyroid carcinoma (PTC) with conventional morphology that metastasized to unusual sites. The first neoplasm was a PTC whose initial clinical manifestation was a large metastasis in the pancreas which mimicked a primary neoplasm. The mediastinal location of the thyroid gland was responsible for the delay in identification of the primary tumor. Eventually, the patient, a 72-year-old man, developed brain and vertebral metastases. The second case was that of a 58-year-old woman with a PTC with initial metastases in cervical lymph nodes; subsequently, the tumor spread to axillary lymph nodes and finally to the breast. Transformation to anaplastic spindle and giant cell carcinoma within the breast metastasis occurred 20 years after the primary thyroid tumor had been diagnosed and surgically treated. The metastatic anaplastic spindle and giant cell carcinoma contained rhabdoid inclusions further complicating identification. To the best of our knowledge, only 3 cases of PTC metastatic to the breast have been reported, none of them with anaplastic transformation. On the other hand, only 3 cases of PTC metastatic to the pancreas have been published, 2 of them of the tall cell variant, and in none of these cases were the first symptoms attributable to the metastasis. Brief comments about the differential diagnosis are included.

Histologic variants of papillary and follicular carcinomas associated with anaplastic spindle and giant cell carcinomas of the thyroid: an analysis of rhabdoid and thyroglobulin inclusions.

We describe the histologic variants of papillary and follicular carcinomas associated with 109 spindle and giant cell carcinomas (SGCC) of the thyroid and determine the incidence of rhabdoid and thyroglobulin inclusions in these tumors. In addition, we searched for rhabdoid and thyroglobulin inclusions in 120 papillary carcinomas (PC) (all 15 variants included), 23 differentiated follicular carcinomas (DFC), (6 with insular pattern), 6 poorly differentiated follicular carcinomas (PDFC) and 34 follicular adenomas (FA). The following differentiated thyroid carcinomas coexisted with SGCC: 51 (46.8%) PC, (34 conventional type, 14 tall cell variant and 3 follicular variant), 6 (5.5%) DFC, 1 follicular carcinoma with insular pattern (0.9%), and 3 oncocytic carcinomas (2.8%). Eleven SGCC (10%) and 2 (33%) PDFC showed rhabdoid features, but lacked thyroglobulin inclusions. Thyroglobulin inclusions were found in 10 FA (29%), 8 (17%) follicular variants of PC and in 7 (30.4%) DFC. There were no rhabdoid inclusions in any of these differentiated thyroid tumors. Our findings support the hypothesis that most SGCC result from dedifferentiation or anaplastic transformation although the mechanisms that underlie this transformation remain unknown. The finding that only 1 (0.9%) SGCC was associated with follicular carcinoma with insular pattern contradicts the opinion that this tumor occupies an intermediate position between differentiated and anaplastic carcinomas. Rhabdoid features are markers of PDFC and SGCC while thyroglobulin inclusions are markers of FA and differentiated thyroid carcinomas with follicular phenotype.

[Endocrine neoplasm of the stomach. Study of thirteen cases]. / Tumores endocrinos del estómago. Análisis de 13 casos.

A Thirteen patients with primary endocrine neoplasm of the stomach were studied for 20 years. Six patients were male and 7 female with an age range of 33 to 77, mean age 57 years. Nine cases corresponded to well differentiated carcinoids and four to neuroendocrine carcinomas. Of the former, three were sporadic and six were associated with atrophic gastritis. These two forms of neoplasm showed important differences: those associated with atrophic gastritis had hypergastrinemia, all of the multiple small tumors confined to the corpus and fundus were well differentiated carcinoids associated with intestinal metaplasia and G cell hyperplasia in antrum and ECL cell hyperplasia in corpus and fundus. Tumors were clinically benign, with an excellent prognosis. All patients are currently alive with no evidence of neoplasm. In only one of these cases, antiparietal cell antibodies were documented; in three of them, extensive intestinal metaplasia probably due to Helicobacter pylori infection was found. In contrast, sporadic carcinoids were large isolated tumors originating in the antrum or corpus. Two patients died as a consequence of the neoplasm; all of them were moderately differentiated and in none of the cases we found evidence of endocrine hyperplasia. All were positive for generic endocrine markers and were focally positive to some of the specific hormone markers. Al four neuroendocrine carcinomas had a clinical course similar to that of gastric adenocarcinomas and were poorly differentiated large tumors. We conclude that gastric carcinoids associated with atrophic gastritis have an excellent prognosis. On the other hand, neuroendocrine carcinomas have a very poor prognosis with fatal outcome of patients. Sporadic carcinoids have an intermediate prognosis.

Tumores endocrinos del estómago: Análisis de 13 casos / Endocrine neoplasm of the stomach: Study of thirteen cases

Se presenta una serie de 13 casos de neoplasias endocrinas del estómago estudiadas en nuestra institución. Seis fueron hombres y 7 mujeres con edades que variaron de 33 a 77 años, con promedio de 57 años. Nueve casos correspondieron a carcinoides bien diferenciados y cuatro a carcinomas neuroendocrinos. De los carcinoides, tres fueron esporádicos y seis estuvieron asociados con gastritis atrófica. Estas dos formas de neoplasias tuvieron diferencias importantes: los asociados con gastritis atrófica, cursaron con hipergastrinemia, fueron pequeños y múltiples en cuerpo y fondo, bien diferenciados y se asociaron con metaplasia intestinal e hiperplasia de células G en antro y de células ECL en cuerpo y fondo; todos tuvieron evolución clínica favorable. Los carcinoides esporádicos en cambio fueron tumores únicos, grandes, ubicados en antro o cuerpo y dos de ellos fallecieron a consecuencia del tumor; eran tumores moderadamente diferenciados y ninguno se asoció con hiperplasia de células endocrinas. Todos fueron positivos para los marcadores endocrinos genéricos y focalmente positivos para alguno de los anticuerpos dirigidos contra hormonas específicas. Sólo en uno de los casos asociados con gastritis atrófica se detectaron anticuerpos anticélulas parietales; tres de ellos se asociaron con metaplasia intestinal extensa probablemente secundaria a infección por Helicobacter pylori. Los cuatro casos de carcinomas neuroendocrinos tuvieron un cuadro clínico similar a los adenocarcinomas gástricos usuales y correspondieron a tumores grandes poco diferenciados. Se concluye que los carcinoides asociados con gastritis atrófica tienen un excelente pronóstico, los carcinomas neuroendocrinos son neoplasias agresivas que causan la muerte de los pacientes y los carcinoides esporádicos tienen un pronóstico intermedio entre ambos extremos.

A Thirteen patients with primary endocrine neoplasm of the stomach were studied for 20 years. Six patients were male and 7 female with an age range of 33 to 77, mean age 57 years. Nine cases corresponded to well differentiated carcinoids and four to neuroendocrine carcinomas. Of the former, three were sporadic and six were associated with atrophic gastritis. These two forms of neoplasm showed important differences: those associated with atrophic gastritis had hypergastrinemia, all of the multiple small tumors confined to the corpus and fundus were well differentiated carcinoids associated with intestinal metaplasia and G cell hyperplasia in antrum and ECL cell hyperplasia in corpus and fundus. Tumors were clinically benign, with an excellent prognosis. All patients are currently alive with no evidence of neoplasm. In only one of these cases, antiparietal cell antibodies were documented; in three of them, extensive intestinal metaplasia probably due to Helicobacter pylori infection was found. In contrast, sporadic carcinoids were large isolated tumors originating in the antrum or corpus. Two patients died as a consequence of the neoplasm; all of them were moderately differentiated and in none of the cases we found evidence of endocrine hyperplasia . AII were positive for generic endocrine markers and were focally positive to some of the specific hormone markers. AII four neuroendocrine carcinomas had a clinical course similar to that of gastric adenocarcinomas and were poorly differentiated large tumors. We conclude that gastric carcinoids associated with atrophic gastritis have an excellent prognosis. On the other hand, neuroendocrine carcinomas have a very poor prognosis with fatal outcome of patients. Sporadic carcinoids have an intermediate prognosis.