Post COVID-19 large pneumatocele: clinical and pathological perspectives.

A middle aged COVID-19 male patient presented 2 weeks after discharge with new onset of dyspnoea and desaturation. Radiological studies revealed right side pneumothorax and lower lobe cystic air space. Chest drain was inserted and on a later date the patient underwent thoracoscopic surgery where a large pneumatocele was identified.

On modeling two immune effectors two strain antigen interaction.

In this paper we consider the fractional order model with two immune effectors interacting with two strain antigen. The systems may explain the recurrence of some diseases e.g.

Malignant lymphoma in Al-Qassim, Saudi Arabia, reclassified according to the WHO classification.

Objective: To determine the frequency of various types of malignant lymphoma (ML) in the Al-Qassim region of Kingdom of Saudi Arabia (KSA) according to recently introduced the WHO classification.

Methods: For this retrospective analysis, material was available in 385 out of 519 cases diagnosed as ML from 1988-2007. Morphological assessment was followed by immunohistochemistry using a panel of antibodies.