The provided system is designed to classify radiation-induced hemorrhagic cystitis based on clinical signs and findings according to the EORTC/RTOG classification. The classification is interpreted as grades, and the inputs range from mild symptoms to severe conditions, even including death directly due to hemorrhagic cystitis.

The system takes a single input corresponding to a description of clinical signs and findings. Each description corresponds to a specific grade of severity, ranging from Grade 1 to Grade 5, as follows:

1. Slight epithelial atrophy, minor telangiectasia, microscopic hematuria is classified as Grade 1.
2. Moderate frequency, generalized telangiectasia, intermittent macroscopic hematuria is classified as Grade 2.
3. Severe frequency and dysuria, generalized telangiectasia often with petechiae, frequent hematuria with decreased bladder capacity is classified as Grade 3.
4. Necrosis/contracted bladder, severe hemorrhagic cystitis is classified as Grade 4.
5. Death directly due to hemorrhagic cystitis is classified as Grade 5.

The computation process is straightforward:
- The system checks the input against each predefined description.
- If a match is found, it assigns the corresponding grade as the result.
- In case no valid input is provided, it returns a message stating that a selection must be made for the input.

The EORTC/RTOG classification of radiation-induced hemorrhagic cystitis is a clinical tool designed for grading the severity of this condition in patients who have undergone radiation therapy. This classification system aids in the assessment of the patient's condition, guiding therapeutic decisions and facilitating communication among healthcare professionals.

The primary components of this classification system are based on clinical signs and findings, which are categorized into five grades. Grade 1 corresponds to slight epithelial atrophy, minor telangiectasia, and microscopic hematuria. Grade 2 is characterized by moderate frequency, generalized telangiectasia, and intermittent macroscopic hematuria. Grade 3 involves severe frequency and dysuria, generalized telangiectasia often with petechiae, and frequent hematuria with decreased bladder capacity. Grade 4 is defined by necrosis or a contracted bladder, and severe hemorrhagic cystitis. Finally, Grade 5 is assigned when death occurs directly due to hemorrhagic cystitis.

The result is determined by matching the patient's clinical signs and findings to the corresponding grade in the classification system. This provides a clear and standardized way to assess the severity of radiation-induced hemorrhagic cystitis, which can be crucial for determining the appropriate course of treatment and predicting patient prognosis.

The European Organisation for Research and Treatment of Cancer/Radiation Therapy Oncology Group (EORTC/RTOG) classification of radiation-induced hemorrhagic cystitis is a clinical tool designed for grading the severity of this condition in patients who have undergone radiation therapy. This classification system aids in the assessment of the patient's condition, guiding therapeutic decisions and facilitating communication among healthcare professionals.

The primary components of this classification system are based on clinical signs and findings, which are categorized into five grades. Grade 1 corresponds to slight epithelial atrophy, minor telangiectasia, and microscopic hematuria. Grade 2 is characterized by moderate frequency, generalized telangiectasia, and intermittent macroscopic hematuria. Grade 3 involves severe frequency and dysuria, generalized telangiectasia often with petechiae, and frequent hematuria with decreased bladder capacity. Grade 4 is defined by necrosis or a contracted bladder, and severe hemorrhagic cystitis. Finally, Grade 5 is assigned when death occurs directly due to hemorrhagic cystitis.

The result is determined by matching the patient's clinical signs and findings to the corresponding grade in the classification system. This provides a clear and standardized way to assess the severity of radiation-induced hemorrhagic cystitis, which can be crucial for determining the appropriate course of treatment and predicting patient prognosis.