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The association between the COVID vaccine and MCD is temporal and by exclusion, and it is not fully established, but it should be considered in postvvaccine MCD.

Sickle cell anemia (SCA) is a hereditary hemoglobin (Hb) disorder associated with a very specific molecular lesion, which is the exchange of glutamic acid for valine in the sixth residue of the Hb beta chain, originating the S Hb. It is characterized by intermittent episodes of vascular occlusion and end-organ damage. Progressive organ damage may affect any organ with brain, eyes, pulmonary, hepatobiliary, spleen, genitourinary, and the musculoskeletal systems being the most commonly involved and reported. Other complications of the disease that have not been well described or studied include cranio-orbital syndromes, oropharyngeal syndromes, periodontal disease, and otologic syndromes. Considering the vaso-occlusive nature of sickle cell disease (SCD), the potential for auditory damage is not unexpected. However, the incidence of subjective hearing impairment among SCA is very low and and little is known about the relationship between SCA and hearing loss. Here we report a 43-year-old female with SCA who presented with sudden bilateral hearing loss and generalized body ache and admitted as a case of sensorineural deafness with vascular crisis; she received IV fluid and analgesia and improved after five days from the therapy.

Iron deficiency anemia is a common cause of anemia that develops when body stores of an iron drop too low to support normal red blood cell (RBC) production. Inadequate dietary iron, impaired iron absorption, bleeding, or loss of body iron in the urine may be the cause. Iron is a key part of red blood cells. Without iron, the blood cannot carry oxygen effectively. Our body normally gets iron through the diet. It also reuses iron from old red blood cells. A little is known about the association between iron deficiency anemia and neutropenia. Here we report a 44-year-old female who presented with iron deficiency anemia and found to have neutropenia recovered after she received intravenous (IV) iron therapy. However, she did not develop any serious infections during the neutropenia and responded to iron therapy.

Coronavirus disease 2019 (COVID-19) is commonly associated with acute respiratory distress syndrome and acute cardiac and renal injuries. However, thromboembolic events are also prevalent in COVID-19. The pathogenesis of COVID-19 hypercoagulability is not well known but may be linked to the cytokine storm induced by a viral infection or endothelial damage that triggers a cascade leading to hypercoagulability. Because vascular endothelium has angiotensin-converting enzyme 2-like lung tissue, COVID-19 targets lung tissue and vascular endothelium, leading to thrombosis. We present a rare case of a young patient with COVID-19 who presented with thrombosis of the cerebral venous system managed with anticoagulation. This case highlights the need for heightened awareness of this atypical but potentially treatable complication of the COVID-19 disease spectrum.

Idiopathic thrombocytopenic purpura (ITP) is a disease in which the immune system attacks platelets and decreases their number, which increases the patient's risk of bleeding. ITP is diagnosed by exclusion and usually manifests as acute disease. It is self-limiting in pediatric patients, while it tends to be a chronic disease in adults. Treatment of ITP focuses on maintaining a sufficient platelet count to decrease the risk of bleeding rather than normalize the platelet count. Most patients respond to first-line treatments, such as steroids and intravenous immunoglobulin (IVIG). However, some cases can become steroid-dependent or unresponsive to first-line therapy, in which case, second-line therapy is required to control symptoms or the platelet count. Second-line therapy includes either rituximab or a thrombopoietin receptor agonist (eltrombopag, romiplostim). In a few cases, when second-line therapy alone is insufficient to control the disease, a combination of therapies is required to control the symptoms and platelet count. Here, we present a case of a 41-year-old man with refractory ITP who did not respond to first-line treatment with either steroids or IVIG or a combination of the two, and also did not respond to eltrombopag alone and required a combination of eltrombopag and rituximab to control his disease.

Iron deficiency anemia is the most common type of anemia, and it occurs when the human body does not have enough of the mineral iron (https://www.healthline.com/health/irondeficiency-anemia#diagnosis). Iron deficiency anemia is caused by blood loss, insufficient dietary intake, or poor absorption of iron from food. Sources of blood loss can include heavy periods, childbirth, uterine fibroids, stomach ulcers, colon cancer, and urinary tract bleeding (https://www.nhlbi.nih.gov/health-topics/iron-deficiency-anemia). Poor absorption of iron from food may occur as a result of an intestinal disorder such as inflammatory bowel disease or celiac disease, or surgery such as a gastric bypass (https://www.who.int/nutrition/topics/ ida/en/). Little is known about the association between iron deficiency anemia and lymphocytopenia. Here, we report on a 17-year-old female who presented with iron deficiency anemia and was found to have lymphopenia. She recovered after having received intravenous iron therapy.